Bikes RankedFrame fit and part compatibility

Frame and bearings

41mm bore, 86mm wide, 28.99mm spindle: the bottom bracket that fits

Two caliper readings name the frame's shell standard, and the marking on the crank spindle picks the part number. This page walks both steps for a 41mm by 86mm shell and a 28.99mm DUB crank, with the spacer layout and the look-alike shells to rule out.

The short answer

Those readings describe a BB86 shell: press-fit, no threads, a 41mm bore and a nominal width of 86.5mm. A 28.99mm spindle is SRAM's DUB size, so you need a DUB press-fit bottom bracket for an 86.5mm road shell. SRAM's road chart lists two. On a SRAM road crank, the marking etched on the spindle next to the word DUB decides which.

SRAM spindle markings and the bottom bracket for a 41mm by 86.5mm shell (markings as described in SRAM's DUB Road Wide article and DUB MTB chart; names and part numbers as printed in SRAM's DUB: Choose a Road Bottom Bracket chart)
Spindle markingWhat SRAM says it isBottom bracket for your shell
DUB aloneStandard road crank, 45mm chainlineDUB PF 86.5 Road, 00.6418.025.000
DUB and WIDEWide road crank, 47.5mm chainlineDUB PF 86.5 Road-Wide, 00.6418.016.004, or 00.6418.016.007 with ceramic bearings
DUB and SLSuper Light cranks, on SRAM's RED level. SRAM's mountain chart also lists DUB SL on MTB cranksThe road chart has no SL row. Check your model's Cranksets Type (see below); SRAM's RED crank pages give Road
DUB and AiA Cannondale-specific spindle, for bikes such as the 2019 Topstone. SRAM's mountain chart also lists DUB Ai, Cannondale onlyThe road chart lists Ai cranks only for Cannondale 83mm shells, so it has no BB86 part. Ask SRAM

SRAM's wide spindle is 5mm longer, and SRAM says a standard DUB bottom bracket cannot simply be reused with a wide crank: the spacers differ, and the right ones come with the right bottom bracket.

If the marking says SL or Ai, or you are not sure the crank is a road crank, look up its model before ordering. Enter the serial number from the crank in the Search by Model Name or Serial Number field at sram.com/service, then read the Cranksets Type line in that model's specifications. SRAM uses types such as Road, Road Wide, MTB and MTB Wide. Its pages for the RED cranksets FC-RED-D1 and FC-RED-E1 both give Road, with a 45.0mm chainline, and SRAM sends owners of its RED, Force and Rival eTap AXS cranksets, which use its DUB Road platform, to this same road chart.

Two measurements, one shell standard

Bore and width together name the shell. The table shows the shells a reading near yours could be, and the part SRAM lists for each with a DUB road crank.

Bare-shell readings and SRAM's DUB road bottom brackets (bottom bracket names and part numbers as printed in SRAM's DUB: Choose a Road Bottom Bracket chart)
Bare-shell readingShell standardCrank marked DUBCrank marked DUB WIDE
41mm bore, 86.5mm wide, no threadsBB86 (PF41), your frameDUB PF 86.5 Road, 00.6418.025.000DUB PF 86.5 Road-Wide, 00.6418.016.004
46mm bore, 86.5mm wide, no threadsBB386EVO (PF46)DUB BB386 86.5 Road, 00.6418.026.000DUB BB386 86.5 Road-Wide, 00.6418.018.005
Threaded M47 x 1.0 (about 46mm inside), 85.5mm wideT47DUB T47 85.5 Road, 00.6418.033.000DUB T47 85.5 Road-Wide, 00.6418.033.001
41mm bore, 89.5 or 92mm wide, no threadsBB89.5 or BB92 (PF41), listed in SRAM's mountain chartNo row in SRAM's road chartNo row in SRAM's road chart
42mm bore, 68mm wide, no threadsBB30 (PF42)DUB BB30 68 Road, 00.6418.017.000DUB BB30 68 Road-Wide, 00.6418.017.003
46mm bore, 68mm wide, no threadsPF30 (PF46)DUB PF30 68 Road, 00.6418.018.000DUB PF30 68 Road-Wide, 00.6418.018.001
Threaded 1.37 in x 24 TPI (about 33.7mm inside), 68mm wideEnglish (BSA)DUB BSA 68 Road, 00.6418.015.000DUB BSA 68 Road-Wide, 00.6418.015.004
Threaded 36mm x 24 TPI (35mm inside), 70mm wideItalianDUB Italian 70 Road, 00.6418.038.000DUB Italian 70 Road-Wide, 00.6418.038.000 (same number)
37mm bearing seat, 90.5mm wideTrek BB90No DUB option; SRAM shows a GXP crank and refers you to TrekNo DUB option

In BB86, BB92 and the other BB-numbered names in this family, the number is the nominal shell width in millimeters. It says nothing about the bore, which is 41mm in all of them. Park Tool lists the family's other names as BB89.5, BB107, BB121, BB132, PF24 and Shimano Press-Fit.

Width alone can mislead. SRAM's road chart lists two bores at 86.5mm: 41mm for BB86 and 46mm for BB386EVO. Threaded T47 shells come close too. The chart's T47 85.5 row works out to 1mm narrower than 86.5, and CeramicSpeed's DUB spacer chart lists a T47 frame 86.5mm wide. Your 86mm reading works out to 0.5mm under 86.5 and 3.5mm under 89.5, the next 41mm width.

If the shell is threaded, the thread settles it. English is 1.37 in x 24 TPI with a left-hand drive-side cup. T47 is M47 x 1.0, also left-hand on the drive side. Italian is 36mm x 24 TPI with both cups right-hand. French (M35 x 1.0, both cups right-hand) and Swiss (M35 x 1.0, left-hand drive side) shells, both of which Park Tool calls obsolete, measure about 34mm inside and have no row in SRAM's DUB road chart.

Park Tool lists the spindles each press-fit family takes. PF41 shells take 24mm, 28.99mm, 30mm and stepped 22/24mm spindles, and PF46 takes 22/24, 24, 28.99 and 30mm. PF42 is also called BB30, after the 30mm spindle used with it at the time, and bearings for 28.99, 24 and 22/24mm spindles are made for it too. The 24mm size is Shimano Hollowtech II, stepped 22/24mm is SRAM GXP, and 30mm covers systems such as Race Face Cinch.

Measure the bare shell, not the cups

Take the crank out and remove any cups or bearings, then measure both the bore and the width, as Wheels Manufacturing's identification guide instructs. Press-fit cups sit on flanges against each face, so a width taken over installed cups reads wide, and a bore reading taken inside a cup measures the cup, not the frame.

Open the caliper's inside jaws against the bore and hold the tool square to the shell, as Park Tool advises. Measure the width across the two outer faces. SRAM's frame drawing for its 41mm PressFit shells, published with its mountain-bike widths, calls for a bore of 41mm plus 0, minus 0.05mm, held for 12mm in from each face, with unpainted press-fit surfaces. That works out to a bore of 40.95 to 41.00mm near each face. Wheels Manufacturing notes these shells may be stepped inside, one more reason to measure within that first 12mm. A reading of about 41mm there places the shell in the 41mm family. If yours reads clearly over 41.00mm, have a shop check the bore before new cups go in.

Spacers and fitting

SRAM's spacer chart for PressFit 86.5 has two layouts. For a DUB road crank: one 3mm spacer outside the drive-side cup and nothing on the non-drive side. For a DUB WIDE road crank: 2.5mm outside the non-drive cup and 5.5mm outside the drive-side cup.

Take the outer spacers off before pressing the cups in; SRAM warns that leaving them on damages the bearings. SRAM calls for a bottom bracket bearing press or a headset press, a shell cleaned with isopropyl alcohol and free of dirt, paint, grease and metal burrs, and grease on the inside of the shell before pressing. It suggests having the frame faced by a professional mechanic. Guide the center tube parallel through the shell; SRAM says it should not touch the frame or any cable. SRAM also advises against removing the center tube to make room for internal brake hose routing, which it says may shorten the bottom bracket's life.

Traps

  • If a Shimano press-fit bottom bracket is still in the frame, it cannot stay. Shimano's road tables list SM-BB92-41B, SM-BB72-41B, SM-BB71-41B and BB-RS500-PB as its press-fit bottom brackets for an 86.5mm shell, all Hollowtech II. Hollowtech II is a 24mm spindle system; 28.99mm works out to nearly 5mm larger. To get old cups out, Park Tool lists its BBT-90.3 for press-fit bearings with a 22 to 24mm inside diameter.
  • A mountain DUB crank is a different case. On SRAM mountain cranks, DUB alone marks a standard Boost crank (52mm chainline), and SRAM's mountain chart lists WIDE, SL and Ai markings on mountain cranks too, so the marking does not separate road from mountain; the Cranksets Type line for your model does. SRAM's mountain chart has no 86.5mm shell, and the spacer tables in SRAM's DUB manual give a PressFit 86.5 layout only for Road and Road-Wide cranks. Neither gives a BB86 bottom bracket and spacer layout for a mountain crank, so ask SRAM or the frame maker before buying.
  • Not every 28.99mm spindle is SRAM's. 5DEV, for example, sells a spindle option it lists as SRAM DUB 29mm (28.99mm), and its install guide sets spacers its own way: a standard SRAM DUB spacer on the drive side, and a non-drive spacer sized by measuring the gap at the preload collar. SRAM's chart assigns spacers by SRAM crank type, so with another maker's crank, follow that maker's spacer instructions.
  • Other makers build BB86 units for DUB spindles, each with its own conditions. Wheels Manufacturing's BB86-29-BB lists BB86 among its frame interfaces, a 41mm shell ID and a 29mm (DUB) spindle, and says the crank spindle must be longer than 104mm in an 86.5mm shell. The SRAM crank pages cited here give no spindle length, so ask Wheels to confirm your crank before ordering.
  • CeramicSpeed's BB86 Bottom Bracket for SRAM DUB Road, SKU 106751, lists a crank diameter of 28.99 and comes with 1mm and 3mm spacers. The DUB spacer chart linked from its page gives BB86 layouts for standard and wide road cranks. For a standard crank it matches SRAM's layout, 3mm on the drive side only. For a wide crank it calls for two 1mm spacers on the non-drive side and two 3mm on the drive side, which works out to 2mm and 6mm, where SRAM's layout is 2.5mm and 5.5mm. Use the spacer chart from the maker of the bottom bracket you fit.

What to check on your bike before ordering

  1. Bare-shell bore and width, taken near the faces: 41mm and about 86.5mm.
  2. No threads inside the shell.
  3. The marking next to DUB on the spindle: DUB alone, or DUB with WIDE. If it says SL or Ai, check the Cranksets Type line for your model at sram.com/service first.
  4. That the crank is a SRAM road crank. SRAM lists PF 86.5 for its RED, Force and Rival 12-speed cranks and the wide-spindle Force and Rival versions, and lists BB DUB PF ROAD86.5 among the bottom brackets for its Apex cranks.
  5. The part number on the box: 00.6418.025.000 for a DUB crank, 00.6418.016.004 or 00.6418.016.007 for a DUB WIDE crank.
  6. SRAM's own notice: confirm with the frame maker that the bottom bracket suits your frame's shell.

The same measure-then-match approach settles headset cups and freehub bodies.

Check it on your own equipment

These take you to the manufacturers and standards bodies the page draws on, so you can look up your exact model.

  • Manufacturer specification
    SRAM DUB: Choose a Road Bottom Bracket chart (opens in a new tab)SRAM's flowchart by threaded or not, shell width and shell I.D.; the English version is pages 1 and 2 of ten. The 86.5mm / 41mm row lists DUB PF 86.5 Road (00.6418.025.000) for a Road crank and DUB PF 86.5 Road-Wide (00.6418.016.004, ceramic 00.6418.016.007) for a Road-Wide crank; page 2 gives the spacer layout for each. — www.sram.com
  • Official support page
    SRAM: DUB Road Wide (opens in a new tab)How to read a road spindle marking: DUB alone is standard road (45mm chainline) and DUB plus Wide is wide road (47.5mm chainline), each with its Q-factor; DUB plus SL marks Super Light RED-level cranks, and DUB plus Ai is a Cannondale-specific spindle. — www.sram.com
  • Official support page
    SRAM DUB Cranksets and Bottom Brackets manual (opens in a new tab)Shell diameters for each DUB family (41mm for DUB PressFit), full road and mountain spacer charts, press-fit installation steps and the serial-number route to the model code. — docs.sram.com
  • Standards reference
    Park Tool: Bottom Bracket Standards and Terminology (opens in a new tab)The PF41, PF42 and PF46 families with their names and bores, the spindle sizes each takes, and thread specs for English, Italian, T47, French and Swiss shells. — www.parktool.com

What this page does not tell you

  • The SRAM part numbers are as printed in SRAM's DUB: Choose a Road Bottom Bracket chart, revision G, copyright 2021, the road chart SRAM's DUB PressFit service page links as of September 2026. If SRAM issues a newer chart, check the number on the box against that one.
  • SRAM's own pages don't print the DUB spindle diameter as a number. The 28.99mm figure comes from CeramicSpeed and 5DEV, Park Tool groups SRAM DUB with spindles from 25mm to 28.99mm, and Wheels Manufacturing calls the same spindle 29mm.
  • SRAM doesn't say which bottom bracket a DUB SL spindle takes, and it uses the SL marking on both road and mountain cranks. Check the Cranksets Type line for your model at sram.com/service.
  • There is no bottom bracket here for a SRAM mountain crank or a Cannondale Ai crank in a BB86 frame, because neither SRAM chart lists one. Ask SRAM or the frame maker.
  • The bore tolerance comes from SRAM's PressFit drawing for mountain-bike widths of 89.5mm to 121mm, which allows plus or minus 0.5mm on those widths. SRAM publishes no such drawing for the 86.5mm width here, so no width tolerance is given for your shell.
  • SRAM says its Wide road cranks suit some 73mm and BB92-width frames, but its road chart gives no BB92 part. For a road crank in a 41mm shell wider than 86.5mm, ask SRAM or the frame maker.

Sources

27 documents, each with the facts on this page it supports. Manufacturers revise specifications, so every source is dated — open it before you buy.

  1. Bottom Bracket Standards and Terminology | Park Tool (opens in a new tab)www.parktool.com·checked 2026-09-23
    • PF41 press-fit shells have a nominal 41mm inside diameter; the family's other names include BB86, BB89.5, BB92, BB107, BB121, BB132, PF24 and Shimano Press-Fit.
    • In the PF41 names the number is the nominal shell width in millimeters, not a bearing press-fit dimension.
    • BB386EVO belongs to the PF46 family, which has an approximately 46mm inside diameter.
    • T47 is threaded 47mm x 1.0mm with a shell inside diameter of about 46mm; the drive side is left-hand thread.
    • BB30 belongs to the PF42 family, which refers to a 42mm shell inside diameter.
    • The term BB30 refers to the 30mm diameter of the spindle used with the standard at the time, and bearings are also available in this standard for 28.99mm, 24mm and 22/24mm spindle systems.
    • PF30 belongs to the PF46 family with an approximately 46mm inside diameter.
    • English threading is 1.37 in x 24 TPI, shell inside diameter about 33.7mm, with a left-hand drive-side cup.
    • Italian threading is 36mm x 24 TPI with a 35mm shell inside diameter, and both cups are right-hand thread.
    • Trek BB90/BB95 shells use 37mm bearing outside diameters with bearing retainers built into the shell.
    • French threading is M35 x 1.0 with an inside diameter of about 34mm and both cups right-hand; Swiss is M35 x 1.0, about 34mm, with a left-hand drive side; Park Tool calls both obsolete.
    • PF41 shells take 24mm, 28.99mm, 30mm and stepped 22/24mm spindle systems; PF46 takes 22/24, 24, 28.99 and 30mm.
  2. DUB: Choose a Road Bottom Bracket (SRAM GEN0000000005976 Rev G) (opens in a new tab)www.sram.com·checked 2026-09-23
    • SRAM's road chart pairs a non-threaded 86.5mm shell with a 41mm I.D. for its DUB PF 86.5 bottom brackets.
    • A bare shell reading 41mm inside and 86mm wide describes a BB86 (PF41) shell with a nominal 86.5mm width.
    • For a non-threaded 86.5mm, 41mm I.D. shell and a Road crankset, SRAM lists DUB PF 86.5 Road, part number 00.6418.025.000.
    • For the same shell and a Road-Wide crankset, SRAM lists DUB PF 86.5 Road-Wide, 00.6418.016.004, and DUB Ceramic PF 86.5 Road-Wide, 00.6418.016.007.
    • SRAM's road chart assigns bottom brackets and spacers by crankset type, with only three types: Road, Road-Wide and Road-Ai; it has no SL row.
    • The road chart's only Road-Ai rows are for 83mm shells (DUB BB30 83-A Road Ai 00.6418.027.001, DUB PF30 83-A Road Ai 00.6418.028.002), both marked Cannondale only; there is no 86.5mm Road-Ai row.
    • At an 86.5mm shell width, SRAM's road chart lists only two bores: 41mm (DUB PF 86.5) and 46mm (DUB BB386 86.5).
    • For an 86.5mm, 46mm I.D. shell, SRAM lists DUB BB386 86.5 Road, 00.6418.026.000, and DUB BB386 86.5 Road-Wide, 00.6418.018.005.
    • For a threaded T47 shell 85.5mm wide, SRAM lists DUB T47 85.5 Road, 00.6418.033.000, and DUB T47 85.5 Road-Wide, 00.6418.033.001.
    • An 85.5mm T47 shell works out to 1mm narrower than an 86.5mm shell.
    • For a 68mm, 42mm I.D. shell, SRAM lists DUB BB30 68 Road, 00.6418.017.000, and DUB BB30 68 Road-Wide, 00.6418.017.003.
    • For a 68mm, 46mm I.D. shell, SRAM lists DUB PF30 68 Road, 00.6418.018.000, and DUB PF30 68 Road-Wide, 00.6418.018.001.
    • For a 68mm English-threaded shell, SRAM lists DUB BSA 68 Road, 00.6418.015.000, and DUB BSA 68 Road-Wide, 00.6418.015.004.
    • For a 70mm Italian-threaded shell, SRAM lists DUB Italian 70 Road and DUB Italian 70 Road-Wide under the same part number, 00.6418.038.000.
    • For a 90.5mm, 37mm shell, SRAM lists no DUB option, shows a GXP crank with BB90, and marks it Trek only with a note to contact Trek for the bottom bracket.
    • SRAM's DUB road chart has threaded rows only for English, T47 and Italian shells, with no French or Swiss row.
    • PressFit 86.5 spacer layout: Road crank, 3mm outer right (drive-side) spacer only; Road-Wide crank, 2.5mm outer left (non-drive) and 5.5mm outer right.
    • The road chart PDF is ten pages; pages 1 and 2 are English, followed by German, Spanish, French and Italian versions.
  3. DUB Cranksets and Bottom Brackets (SRAM user manual) (opens in a new tab)docs.sram.com·checked 2026-09-23
    • DUB PressFit bottom brackets are compatible with frame shells with a 41mm inner diameter.
    • SRAM product model code and specification details can be identified from the serial number, entered in the Search by Model Name or Serial Number field at sram.com/service.
    • SRAM's DUB manual gives the same PressFit (86.5) layout, and its spacer tables list PressFit (86.5) only for Road and Road-Wide cranks; its mountain PressFit rows start at 89.5mm.
    • Remove the outer spacers before installing the cups; failing to remove them damages the bearings.
    • DUB press-fit cups are installed with a bottom bracket bearing press tool or a headset press.
    • Clean the shell with isopropyl alcohol so it is free of dirt, paint, grease and metal burrs; have the frame faced by a professional mechanic for best results; grease the inside of the shell.
    • Guide the center tube parallel through the shell; it should not contact the frame or any cable.
    • Removing the center tube to accommodate internal brake hose routing is not recommended and may shorten the bottom bracket's lifespan.
    • SRAM tells users to consult the frame manufacturer to confirm the bottom bracket is compatible with the frame's shell.
  4. DUB PressFit Bottom Bracket | BB-DUB-PF-A1 | SRAM (opens in a new tab)www.sram.com·checked 2026-09-23
    • SRAM's DUB PressFit bottom bracket lists shells PF 86.5, 89.5, 92, 104.5, 107 and 121, and a Cranksets Type list of DH, FAT, MTB, MTB Wide, Road, Road Wide and Super Boost+.
    • An 86mm width reading works out to 0.5mm under 86.5mm and 3.5mm under 89.5mm, the next 41mm shell width SRAM lists.
    • The SRAM Cranksets Type field separates road from mountain cranks: SRAM's types include Road, Road Wide, MTB and MTB Wide.
  5. BB86 Bottom Bracket for SRAM DUB Road | CeramicSpeed (opens in a new tab)ceramicspeed.com·checked 2026-09-23
    • A 28.99mm crank spindle is SRAM's DUB size: CeramicSpeed's BB86 unit for SRAM DUB Road lists crank brand SRAM and crank diameter 28.99.
    • CeramicSpeed's BB86 Bottom Bracket for SRAM DUB Road is SKU 106751, BB type BB86, crank diameter 28.99, crank brand SRAM, and includes four 1mm and four 3mm spacers; its page links a spacer chart PDF.
  6. Bottom Bracket Removal & Installation: Press Fit | Park Tool (opens in a new tab)www.parktool.com·checked 2026-09-23
    • Park Tool groups SRAM DUB cranks with spindles from 25mm to 28.99mm.
    • Park Tool uses its BBT-90.3 for press-fit bearings with a 22 to 24mm inside diameter.
  7. What Crank Do I Need? FAQ Spindle Diameter for 5DEV Cranks (opens in a new tab)ride5dev.com·checked 2026-09-23
    • 5DEV sells a spindle option it lists as SRAM DUB 29mm (28.99mm) for bikes with SRAM cranks.
  8. DUB ROAD Wide | SRAM (opens in a new tab)www.sram.com·checked 2026-09-23
    • A spindle marked DUB alone is SRAM's standard road crank with a 45mm chainline; DUB plus Wide is the wide road crank with a 47.5mm chainline.
    • SRAM says a spindle marked DUB plus SL is a Super Light crank, which comes on its RED level of cranks.
    • SRAM says a spindle marked DUB plus Ai is a Cannondale-specific spindle for bicycles such as the 2019 Topstone.
    • SRAM's DUB Road Wide article does not say which bottom bracket an SL or Ai spindle uses.
    • SRAM says DUB Road Wide accommodates road and some wider 73mm or BB92-width frame bottom bracket standards.
  9. DUB MTB Bottom Bracket Compatibility Chart (SRAM GEN0000000006073 Rev K) (opens in a new tab)www.sram.com·checked 2026-09-23
    • SRAM's MTB chart lists the spindle etch DUB or DUB SL for its MTB crankset type, DUB WIDE for MTB Wide and some DH cranks, and DUB Ai for MTB Ai cranks, which it marks Cannondale only.
    • SRAM DUB cranks have the crankset type etched on the spindle.
    • SRAM's MTB chart covers 41mm shells 89.5 and 92mm wide (DUB PF 89.5 MTB and DUB PF 92 MTB, 00.6418.016.000); SRAM's road chart has no 89.5 or 92mm row.
    • SRAM's MTB chart lists no 86.5mm frame shell.
  10. Can I use my current standard DUB bottom bracket with DUB Wide cranks? - SRAM (opens in a new tab)support.sram.com·checked 2026-09-23
    • Wide cranksets have a spindle 5mm longer than standard; a current standard DUB bottom bracket cannot be used with DUB Wide cranks without the right spacers, which are included with the correct bottom bracket.
  11. RED Crankset | FC-RED-E1 | SRAM | Service (opens in a new tab)www.sram.com·checked 2026-09-23
    • SRAM's service page for the RED crankset FC-RED-E1 lists Cranksets Type: Road and Chainline: 45.0mm, with no spindle length.
  12. RED Crankset | FC-RED-D1 | SRAM | Service (opens in a new tab)www.sram.com·checked 2026-09-23
    • SRAM's service page for the RED crankset FC-RED-D1 lists Cranksets Type: Road and Chainline: 45.0mm, with no spindle length.
  13. What bottom bracket interface standards are the new SRAM RED or Force eTap AXS cranksets designed to work with? - SRAM (opens in a new tab)support.sram.com·checked 2026-09-23
    • SRAM says its RED, Force and Rival eTap AXS cranksets use its DUB Road platform and refers owners to its Road Bottom Bracket Compatibility Map to choose the bottom bracket.
  14. Identify Your Frame BB Standard - Wheels Mfg (opens in a new tab)wheelsmfg.com·checked 2026-09-23
    • BB386EVO shells have a 46mm ID and no threads, essentially a PF30 with an 86.5mm-wide shell.
    • BB86/BB92 shells have a 41mm ID, no threads, and were designed for 24mm spindle cranks (Shimano HollowTech II).
    • To identify the shell, remove the crankset and any installed cups or bearings, then measure both the inner diameter and the width of the shell.
    • A width measured over installed cups reads wider than the shell, and a bore measured inside a cup gives the cup's dimension rather than the frame's.
    • A 28.99mm spindle works out to 4.99mm larger than a 24mm spindle.
  15. Tech sheet: CeramicSpeed Bottom Bracket Spacer overview for SRAM DUB (opens in a new tab)cdn.shopify.com·checked 2026-09-23
    • CeramicSpeed's DUB spacer chart lists a road T47 frame 86.5mm wide.
    • CeramicSpeed's DUB spacer chart gives BB86 (86.5) road layouts: standard, 0 non-drive and 3mm drive side; wide, 2 x 1mm non-drive and 2 x 3mm drive side.
    • CeramicSpeed's wide BB86 layout works out to 2mm non-drive and 6mm drive side, against SRAM's 2.5mm and 5.5mm; its standard layout matches SRAM's 3mm drive-side spacer.
  16. Sheldon Brown's Bottom Bracket Size Database (opens in a new tab)www.sheldonbrown.com·checked 2026-09-23
    • Italian bottom bracket shells are 70mm wide.
  17. BB86/92 Technical Info - Wheels Mfg (opens in a new tab)wheelsmfg.com·checked 2026-09-23
    • Stepped 22/24mm spindles are the GXP size.
    • BB86/92 shells may have a stepped design but no snap-ring grooves.
  18. Bottom Bracket Tool Selection: Press Fit | Park Tool (opens in a new tab)www.parktool.com·checked 2026-09-23
    • 30mm spindle systems include Race Face Cinch as well as SRAM PF30 and BB30 bottom brackets.
  19. 2024 MTB Components Frame Fit Specifications (SRAM) (opens in a new tab)www.sram.com·checked 2026-09-23
    • DUB press-fit cups should be pressed fully in, with no gap between the flange and the shell.
    • SRAM's PressFit shell drawing specifies a 41mm bore, +0.0/-0.05mm, with the tolerance applying 12mm inboard from each outer face and unpainted press-fit surfaces; its width table covers 89.5 to 121mm with a width tolerance of plus or minus 0.5mm.
    • That bore tolerance works out to a reading of 40.95 to 41.00mm near each face.
  20. Proper Use of a Digital Caliper | Park Tool (opens in a new tab)www.parktool.com·checked 2026-09-23
    • For an inside diameter, pull the caliper's inside jaws outward, and hold the caliper at a right angle to the object.
  21. SHIMANO 2026-2027 Spec. Handbook (Ver. 2.7, Sep. 17, 2026) (opens in a new tab)productinfo.shimano.com·checked 2026-09-23
    • Shimano lists SM-BB92-41B, SM-BB72-41B, SM-BB71-41B and BB-RS500-PB as its Hollowtech II press-fit road bottom brackets for an 86.5mm shell.
  22. DUB MTB Wide (CL55) | SRAM (opens in a new tab)www.sram.com·checked 2026-09-23
    • On SRAM mountain cranks, a spindle marked DUB alone is standard Boost with a 52mm chainline, and DUB plus Wide is for CL55 bikes.
  23. BB86 to 29MM (DUB Compatible) Flanged, Dual Row PressFit 86/92 ABEC-3 Bottom Bracket - Wheels Mfg (opens in a new tab)wheelsmfg.com·checked 2026-09-23
    • Wheels Manufacturing's BB86-29-BB lists frame interfaces BB86, BB92, PF90, BB104/107, PF121 and PF132, a 41mm shell I.D., a 29mm diameter spindle for SRAM DUB compatible cranks, and requires a crank spindle longer than 104mm in an 86.5mm shell.
  24. Determining Proper Spacers for my Frame | 5DEV Crank Install (opens in a new tab)ride5dev.com·checked 2026-09-23
    • 5DEV's install guide suggests a standard SRAM DUB spacer on the drive side and sizing the non-drive spacer by measuring the gap between the backed-out preload collar and the bottom bracket, leaving 0.5 to 1mm.
  25. What frame bottom bracket interface standards are Rival cranksets designed to work with? - SRAM (opens in a new tab)support.sram.com·checked 2026-09-23
    • SRAM lists PF 86.5 among compatible frame interfaces for its RED, Force and Rival 12-speed cranksets and for Force and Rival wide-spindle 12-speed cranksets, with the appropriate DUB bottom bracket and spacers.
  26. What bottom bracket interface standards are the Apex cranksets designed to work with? - SRAM (opens in a new tab)support.sram.com·checked 2026-09-23
    • SRAM lists BB DUB PF ROAD86.5 among the DUB bottom brackets its Apex cranksets work with.
  27. DUB PressFit Bottom Bracket | BB-DUB-PF-A1 | SRAM | Service (opens in a new tab)www.sram.com·checked 2026-09-23
    • The road chart cited is SRAM document GEN0000000005976 Rev G, copyright 2021, and it is the road map SRAM's current DUB PressFit service page links.