Wheels, tires and axles
Lost the rear thru axle? The numbers to match before you order
A 12 mm rear thru axle is defined by its diameter, the hub width it spans, its thread pitch and its length, and your frame's listing may add a thread length or an axle system. This page shows where to find each number when the old axle is gone, so you order against your frame's numbers rather than a guess.
The short answer
You need the diameter (12 mm), the hub width the axle spans, the thread pitch and the length. If your frame's listing also gives a thread length or names an axle system, such as Syntace X-12, match those too. The pitch must match your frame exactly. The length must suit your frame, and the hub width doesn't tell you what it is. With the old axle gone, take the numbers from the bike maker's parts listing for your exact model and year, from a dealer, or from an axle maker's fitment finder that asks for the brand, model and hub size. First, check that your bike doesn't use a proprietary axle system. Those need an axle made for that system.
The numbers to match
| Number | What it means | Values you'll see | Where to get it without the old axle |
|---|---|---|---|
| Diameter | Thickness of the shaft | Yours is 12 mm. Front axles can be 12, 15 or 20 mm | You already have it: 12 mm |
| Hub width | The hub's over-locknut dimension (O.L.D.). SRAM lists it as Hub OLD, DT Swiss as built-in dimension | 142; 148 (Boost); 157 (Super Boost at SRAM, Boost+ at DT Swiss). Other listed widths include 135, 150, 177 and 197 | Your wheel's or hub's specs, or measure the hub (see below) |
| Thread pitch | Spacing of the threads, in millimeters | M12 x 1.0, M12 x 1.5, M12 x 1.75. Also a 1.25 mm pitch, which Robert Axle Project lists for Orbea mountain bikes with that thread, and Mavic Speed Release's double lead-in 1.0 | The bike maker's parts listing or manual, a dealer, or a fitment finder |
| Length | The straight shaft, not counting the head or any tapered spacer | For 142 mm hubs: 162.5 to 171 mm in DT Swiss's list, 163 to 171 mm in Shimano's | The bike maker's parts listing or manual, a dealer, or a fitment finder |
| Thread length | How much of the shaft's end is threaded. SRAM writes it as TL, DT Swiss as G | 11.5 to 15 mm across DT Swiss's axles for 142 mm hubs; 20 mm on SRAM's standard rear Maxles | Your frame's listing, if it gives one |
| Axle system | A named design with its own dimensions | Syntace X-12; proprietary systems such as R.A.T., Naild and Mavic Speed Release | Your frame's documentation |
Rule out a proprietary system first
Some bikes use their own axle systems. Robert Axle Project, a maker of replacement axles, gives these as examples, not a complete list:
- R.A.T. (Rapid Axle Technology): some models of FOCUS, Merida, Centurion and Cervélo.
- Naild: some models of Marin, Polygon and Argon 18.
- Mavic Speed Release: a variety of bikes. Robert Axle Project says the double lead-in 1.0 thread on its Mavic axle works only with Mavic Speed Release.
- Surly bikes with Gnot Boost or MDS dropouts.
If your bike's documentation names one of these, order an axle made for that system. Robert Axle Project lists replacement axles for R.A.T., Naild and Mavic Speed Release. For Surly's dropouts it lists only trailer axles.
For a Surly, go by Surly's own thru-axle page, which names the frames each of its rear axles fits:
- 12x142: the Midnight Special, and bikes with MDS dropouts, including the Instigator, Legacy Karate Monkey and Legacy Krampus.
- 12x142/148: frames with Surly's Gnot Boost spacing (145 mm). Surly lists the Karate Monkey, Krampus, Troll, Ogre and ECR, and says this axle works with a 142 or a 148 mm hub.
- 12x177: the Wednesday.
- 12x197: the Ice Cream Truck and Big Fat Dummy.
Why the hub width doesn't give you the length
The axle runs through the frame on both sides of the hub, so it is longer than the hub is wide. Robert Axle Project makes the point directly: axle length is not the same as hub width. SRAM's rear frame drawing shows the same layout, with the hub's OLD between the two dropouts and the axle passing through both. How much longer the axle is depends on the frame.
The makers' own lists show how much that varies. For 142 mm hubs, DT Swiss lists lengths from 162.5 to 171 mm, which works out to an 8.5 mm spread, and Shimano lists 163, 166 and 171 mm. DT Swiss, Shimano and SRAM each publish one length per axle and state no tolerance, so match the length listed for your frame. Robert Axle Project says its own axles fit within 2 mm either way. That allowance is its statement about its own axles only.
Compare lengths within one maker's list. Whether a spacer is counted changes the figure: Robert Axle Project gives two lengths for each of its M12 x 1.0 rear axles, with and without the tapered X-12 spacer that comes with them, such as 162 or 167 mm.
The frame maker sets the thread, not the axle's brand
The axle screws into threads in the frame. DT Swiss says an axle's width, diameter and thread vary and are defined by the frame and fork maker, which is why an axle has to be matched to the frame. SRAM's frame specification gives the thread for its standard Maxle axles, lets frame designers request a custom axle for their own dropouts, and makes them responsible for compatibility. So one axle maker, and even one axle name, can come in several pitches:
- SRAM lists its Maxle Stealth rear axle in M12 x 1.0, M12 x 1.5 and M12 x 1.75, in eleven lengths from 160 to 195 mm.
- Shimano lists M12 x 1.5 for every E-THRU axle it marks for 142, 148 or 157 x 12 hubs, and M12 x 1.75 for the 12 mm version of the SAINT SM-AX80, which it marks for 135 x 12 and 150 x 12.
- DT Swiss lists rear axles in both M12 x 1.0 and M12 x 1.5 for the same 142 and 148 mm hubs.
Take the pitch from a document for your frame. Robert Axle Project's printable template shows only 1.0, 1.5 and 1.75, but it also makes a 12 mm axle with a 1.25 mm pitch for Orbea mountain bikes with that thread. Don't assume there are only three.
If your bike's parts list names the axle
If the bike maker's listing gives a part number or model name, the axle makers' own lists give you every number.
A SRAM Maxle description
SRAM's part descriptions spell out the numbers. Its decoder reads L as the length, measured from under the head to the tip of the thread, and TL as the thread length, followed by the thread diameter and pitch. So AX MAXLE STLTH REAR L174 TL20 M12X1.75 is a 174 mm axle with a 20 mm thread length and an M12 x 1.75 thread.
A Shimano E-THRU model
Shimano's spec handbook marks the hub sizes each E-THRU axle is for and gives its thread and length. A model number settles the length. The E-THRU name alone doesn't: Shimano lists three lengths for 142 x 12.
| Hub size, as Shimano marks it | Model | Thread | Length |
|---|---|---|---|
| 142 x 12 | SM-AX720-142x12 | M12 x 1.5 | 163 mm |
| 142 x 12 | AX-MT700-142x12, AX-MT500-142x12 | M12 x 1.5 | 166 mm |
| 142 x 12 | SM-AX56 | M12 x 1.5 | 171 mm |
| 148 x 12 | AX-MT700-148x12, AX-MT500-148x12 | M12 x 1.5 | 172 mm |
| 148 x 12 | SM-AX56-B | M12 x 1.5 | 177 mm |
| 148 x 12 and 157 x 12 | AX-MT700-157x12 | M12 x 1.5 | 181 mm |
| 157 x 12 | AX-MT500-157x12 | M12 x 1.5 | 181 mm |
Shimano marks the AX-MT700-157x12 for both 148 x 12 and 157 x 12 hubs, but the AX-MT500-157x12 for 157 x 12 only. If your frame takes a 148 mm hub, go by the model your bike maker lists.
A DT Swiss part number, or a Syntace X-12 frame
DT Swiss lists every RWS axle with its hub width, length L, thread length G, thread and part number, and lists its X12 versions separately. It describes X-12 as a 12 mm thru-axle system developed by Syntace, with standardized axle dimensions and thread. If your frame's documentation says X-12, DT Swiss's X12 versions are M12 x 1.0 with a 15 mm thread length: 162.5 mm long for 142 mm hubs and 168.5 mm for 148 mm Boost. Its other M12 x 1.0 axles for 142 mm hubs are 167.7 mm long, which works out to 5.2 mm longer.
| Hub width | Part number | DT Swiss version | Thread | Length L | Thread length G |
|---|---|---|---|---|---|
| 142 mm | HWQASM00S2955S | Thru bolt, X12 | M12 x 1.0 | 162.5 mm | 15 mm |
| 142 mm | HWQASM00S2016S | Thru axle | M12 x 1.5 | 163 mm | 13 mm |
| 142 mm | HWQASM00S2961S | Thru bolt | M12 x 1.0 | 167.7 mm | 15 mm |
| 142 mm | HWQASM00S3632S | Thru axle (E-thru) | M12 x 1.5 | 171 mm | 11.5 mm |
| 142 mm | HWQASM00S2034S | Plug-in, lever and rod | M12 x 1.5 | 171 mm | 13 mm |
| 148 mm Boost | HWQASM00S9566S | Thru axle, X12 | M12 x 1.0 | 168.5 mm | 15 mm |
| 148 mm Boost | HWQASM00S2155S | Thru axle | M12 x 1.0 | 173.7 mm | 15 mm |
| 148 mm Boost | HWQASM00S2035S | Plug-in, lever and rod | M12 x 1.5 | 177 mm | 13 mm |
| 148 mm Boost | HWQASM00S6778S | Thru axle | M12 x 1.5 | 178 mm | 12 mm |
DT Swiss also lists plug-in X12 versions at the same lengths: 162.5 mm for 142 mm hubs and 168.5 mm for 148 mm Boost. The two 171 mm axles above share a thread but not a thread length, so match G as well if your listing gives it.
Finding the numbers when the axle is gone
- Look up the rear axle for your exact model and year in the bike maker's parts listing or owner's manual, or ask a dealer for the part number. With a part number or description, the lists above give you the rest.
- If you can't find it, try an axle maker's fitment finder. At Robert Axle Project's Axle Finder, choose Wheel Only - Rear at the first question, "I am attaching a...". The other choices are for trailers, trainers, a FollowMe tandem and the front wheel. It then asks the bike type, whether it's an e-bike, the brand, the hub size and the model, and points you to one of its own axles.
- If your bike isn't listed there, Robert Axle Project's fallback is its measuring guide, which starts by pulling out the old axle. Without it, go back to the bike maker or a dealer for the part number, or borrow the axle from an identical bike.
- With a borrowed axle, look for printed markings first. Many axles carry the length (L) and thread pitch (TP). If there are none, measure the straight shaft, leaving out the head and any tapered spacer, and hold the threads against Robert Axle Project's printable template. Print it at actual size and check the scale with a ruler.
- Confirm the hub width on your wheel. The hub's or wheel's specs may list it: Shimano gives it as O.L.D., SRAM as Hub OLD, DT Swiss as built-in dimension. To measure it, measure across the hub's outer faces, the ones that sit against the inside of the dropouts, and match the result to a listed width such as 142, 148 or 157 mm.
If it's the front axle
Front hubs are listed at 100 mm for 12 and 15 mm axles, and at 110 mm for 15 and 20 mm axles. DT Swiss calls its 110 mm hubs for 15 mm axles Boost. Robert Axle Project lists 15 mm front axles with M15 x 1.0, M15 x 1.5 and M14 x 1.5 threads, so the thread size can differ from the shaft size. SRAM's fork specification gives M15 x 1.5 for its standard 15 mm Maxle and M12 x 1.5 for its 12 mm one. As at the rear, take the thread from your fork's documentation.
Before you order
- Diameter: 12 mm.
- Hub width confirmed: 142, 148, 157 or another listed width.
- Thread pitch taken from a document for your exact frame, not guessed from the axle's brand.
- Length matching your frame's listing. For a Robert Axle Project axle, within the 2 mm it states.
- Thread length and axle system (such as Syntace X-12) matching, if your listing gives them.
- No proprietary system, or an axle made for that system.
When the axle arrives, start the thread by hand. Robert Axle Project's instructions for its replacement axles say to engage the threads carefully and hand-tighten, and to stop if the axle runs out of thread before it tightens the frame to the hub. They also warn that the wrong thread pitch can damage the bike. If the axle resists, stop and recheck the pitch rather than forcing it.
Replacing the whole rear wheel instead? Check that its hub width suits the frame, then identify its freehub body before moving your cassette over.
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.
- Merchant listing
Robert Axle Project's Axle Finder: aftermarket axles by bike model (opens in a new tab)A step-by-step form from a maker of aftermarket axles. At "I am attaching a...", choose Wheel Only - Rear. It then asks the bike type, whether it's an e-bike, the brand, the hub size and the model, and points you to one of Robert Axle Project's own axles. If your bike isn't listed, get the part number from the bike maker or a dealer instead. — robertaxleproject.com - Official support page
Robert Axle Project: What Axle Do I Need for My Bike? (opens in a new tab)Measuring steps, printable thread and length templates for letter and A4 paper, and tabs of axles by use. The plain replacement axles are under the Lightning Rear tab, listed by thread pitch and shaft length. The steps start by pulling out the old axle, so use them with an axle borrowed from an identical bike. — robertaxleproject.com - Manufacturer specification
DT Swiss RWS 12 mm thru axle specifications (opens in a new tab)DT Swiss's RWS 12 mm axles, each with its built-in dimension (hub width), length L, thread length G, thread and part number. The X12 versions are listed as separate models. — www.dtswiss.com - Manufacturer specification
Shimano 2026-2027 spec handbook: E-THRU axle table (opens in a new tab)Shimano's spec handbook, version 2.7, as a PDF. The E-THRU axle table on printed page 255 (page 258 of the file) marks the hub sizes each axle is for and gives its thread pitch and length. — productinfo.shimano.com
What this page does not tell you
- Thread pitch isn't listed here by bike brand. The frame maker sets it, so check the documentation for your own model, ask a dealer, or use a fitment finder that asks for the model.
- Lengths are compared only within each maker's own list. A DT Swiss length and a Shimano length that look alike aren't necessarily interchangeable, because whether a spacer is counted can change the figure.
- The 2 mm length allowance is Robert Axle Project's statement about its own axles. DT Swiss, Shimano and SRAM publish one length per axle and state no tolerance, so match their lengths exactly.
- Some frames take a custom axle. SRAM lets frame designers request custom Maxles for their own dropouts. For those, get the part number from the bike maker or a dealer.
- Shimano's figures come from version 2.7 of its 2026-2027 spec handbook. Shimano revises the handbook, so check the current edition before you order a Shimano axle.
Sources
16 documents, each with the facts on this page it supports. Manufacturers revise specifications, so every source is dated — open it before you buy.
- Robert Axle Project says thru axle thread pitch must match exactly.
- Robert Axle Project says axle length is not the same as hub width: a 12 x 142 bike has a much longer axle because it passes through the frame on both sides of the 142 mm hub.
- Robert Axle Project measures axle length along the straight shaft, leaving out the axle head and any tapered spacer.
- Robert Axle Project says all its axles are compatible within 2 mm of length either way.
- Many axles have their length (L) and thread pitch (TP) printed on them.
- Robert Axle Project's measuring guide is its route for bikes not listed in its Axle Finder, and its first step is to pull the old axle out.
- Robert Axle Project's axle tables are grouped in tabs for kid trailers, BOB trailers, FollowMe tandems, resistance trainers, front axles (Lightning Front) and rear axles (Lightning Rear); the Lightning Rear tab lists 12 mm bolt-on replacement axles by thread pitch and shaft length.
- Robert Axle Project's measuring guide offers printable templates for 8.5 x 11 inch and A4 paper.
- Robert Axle Project lists 15 mm front axles with M15 x 1.0, M15 x 1.5 and M14 x 1.5 threads.
- Robert Axle Project lists 12 mm front axles in M12 x 1.0, M12 x 1.5 and M12 x 1.75, and a Mavic Speed Release front axle with a double lead thread.
- A 15 mm axle can have a 14 mm thread, so the thread size can differ from the shaft size.
- Robert Axle Project lists 12 mm rear bolt-on axles in 1.0, 1.5 and 1.75 mm thread pitches.
- Robert Axle Project's printable template shows 12 x 1.0, 12 x 1.5 and 12 x 1.75 threads, and says to print it at actual size and check the scale with a ruler.
- Robert Axle Project's M12 x 1.0 rear axles come with a tapered X-12 spacer, and it gives each one's length with and without the spacer, such as 162 or 167 mm.
- Whether a spacer is counted changes a published length, so compare lengths within one maker's list.
- Robert Axle Project's instructions say to engage the threads carefully and hand-tighten, and to stop if the axle runs out of threads before it tightens the frame to the hub.
- Robert Axle Project's instructions warn that an incorrect thread pitch can damage the bicycle.
- Robert Axle Project's instructions repeat that its axles are compatible within 2 mm of length.
- Start a new axle's thread by hand, and if it resists, stop and recheck the pitch rather than forcing it.
- Robert Axle Project makes a 12 mm, 180 mm trailer axle with a 1.25 mm thread for Orbea mountain bikes that use a 1.25 mm thread pitch thru axle.
- Robert Axle Project's Axle Finder first asks what you are attaching, with the choices BOB Trailer, FollowMe Tandem, Kid Trailer, Trainer, Wheel Only - Front and Wheel Only - Rear; it then asks the bike type, whether it is an e-bike, the brand, the hub size and the model, and points you to one of Robert Axle Project's own axles.
- Robert Axle Project names proprietary axle systems it supports as examples: R.A.T. (Rapid Axle Technology) on some models of FOCUS, Merida, Centurion and Cervélo; Naild on some models of Marin, Polygon and Argon 18; Mavic Speed Release on a variety of bikes; and Surly bikes with GnotBoost or MDS dropouts.
- Robert Axle Project says its Mavic axle has a double lead-in 1.0 thread pitch that works only with Mavic Speed Release.
- Robert Axle Project lists replacement axles for R.A.T., Naild and Mavic Speed Release bikes, and only kid trailer axles for Surly GnotBoost and MDS dropouts.
- A bike with a proprietary axle system needs an axle made for that system.
- Surly lists its rear thru-axles by frame: 12x142 for the Midnight Special and MDS-dropout bikes including the Instigator, Legacy Karate Monkey and Legacy Krampus; 12x142/148 for frames with Gnot Boost spacing (145 mm), listed as fitting the Karate Monkey, Krampus, Troll, Ogre and ECR; 12x177 for the Wednesday; 12x197 for the Ice Cream Truck and Big Fat Dummy.
- Surly says its 12x142/148 rear axle, for Gnot Boost spacing (145 mm), works with 142 or 148 mm rear hubs.
- Surly lists 12x177 and 12x197 rear thru axles.
- DT Swiss says thru axles must be compatible with the frame and fork because an axle's built-in width, diameter and thread vary and are defined by the frame and fork maker.
- The frame maker, not the axle's brand, sets the thread an axle needs.
- A replacement wheel's hub width has to suit the frame.
- DT Swiss describes X-12 as a 12 mm thru-axle system developed by Syntace, with standardized axle dimensions and thread.
- DT Swiss lists each RWS axle with its built-in dimension (hub width), length L, thread length G, thread and part number, and lists X12 versions as separate models.
- DT Swiss RWS thru bolt X12, HWQASM00S2955S: 142 mm, M12 x 1.0, length 162.5 mm, thread length 15 mm.
- DT Swiss RWS thru axle, HWQASM00S2016S: 142 mm, M12 x 1.5, length 163 mm, thread length 13 mm.
- DT Swiss RWS thru bolt, HWQASM00S2961S: 142 mm, M12 x 1.0, length 167.7 mm, thread length 15 mm.
- DT Swiss RWS thru axle (E-thru), HWQASM00S3632S: 142 mm, M12 x 1.5, length 171 mm, thread length 11.5 mm.
- DT Swiss RWS plug-in (lever and rod), HWQASM00S2034S: 142 mm, M12 x 1.5, length 171 mm, thread length 13 mm.
- DT Swiss RWS thru axle X12, HWQASM00S9566S: 148 mm Boost, M12 x 1.0, length 168.5 mm, thread length 15 mm.
- DT Swiss RWS thru axle, HWQASM00S2155S: 148 mm Boost, M12 x 1.0, length 173.7 mm, thread length 15 mm.
- DT Swiss RWS plug-in (lever and rod), HWQASM00S2035S: 148 mm Boost, M12 x 1.5, length 177 mm, thread length 13 mm.
- DT Swiss RWS thru axle, HWQASM00S6778S: 148 mm Boost, M12 x 1.5, length 178 mm, thread length 12 mm.
- DT Swiss also lists X12 plug-in versions at 162.5 mm for 142 mm hubs (HWQASM00S0236S, HWQASM00S0234S) and 168.5 mm for 148 mm Boost (HWQASM00S9923S), all M12 x 1.0.
- DT Swiss's X12 axles are M12 x 1.0 with a 15 mm thread length: 162.5 mm long for 142 mm hubs and 168.5 mm for 148 mm Boost.
- DT Swiss's non-X12 M12 x 1.0 axles for 142 mm hubs are 167.7 mm long, which works out to 5.2 mm longer than its 162.5 mm X12 versions.
- For 142 mm hubs, DT Swiss's lengths run from 162.5 to 171 mm, which works out to an 8.5 mm spread.
- DT Swiss's thread length G on its axles for 142 mm hubs runs from 11.5 to 15 mm.
- DT Swiss lists 12 mm rear axles in both M12 x 1.0 and M12 x 1.5 for the same 142 and 148 mm hubs.
- DT Swiss publishes one length per axle and no fit range.
- Two DT Swiss 171 mm M12 x 1.5 axles for 142 mm hubs have different thread lengths, 11.5 and 13 mm, so thread length is worth matching when a listing gives it.
- DT Swiss lists 12 mm RWS axles for 100 mm hubs and a 15 mm RWS axle for 110 mm Boost hubs.
- A rear axle's length has to suit the frame, and the hub width alone does not set it.
- DT Swiss names its 157 mm rear hub for 12 mm thru axles Boost+ (Rear wheel 350 DBIS Boost+ for thru axle 12mm).
- DT Swiss lists 350 front hubs at 100 mm for 15 mm thru axles and at 110 mm for 15 and 20 mm thru axles, and labels its 110 mm hubs for 15 mm axles Boost.
- SRAM lists the Maxle Stealth Rear for Hub OLD 12x142 and 12x148, in M12 x 1.0, M12 x 1.5 and M12 x 1.75 thread pitches, and in eleven lengths from 160 to 195 mm.
- SRAM gives each Maxle Stealth Rear length as a single value, with no fit range.
- SRAM calls the hub width Hub OLD.
- SRAM's service listing for its rear Maxles gives Hub OLD widths of 12x135, 12x142, 12x148, 12x150 and 12x197.
- SRAM calls a 148 mm rear dropout width Standard Boost and a 157 mm rear dropout width Super Boost.
- SRAM's Maxle decoder reads L148 TL9 M15 X 1.5 as a 148 mm length, a 9 mm thread length, a 15 mm thread diameter and a 1.5 mm thread pitch, with the length measured from under the head to the end of the thread.
- Thread pitch is the distance between neighboring threads, in millimeters.
- SRAM's standard rear Maxles are described as L174 or L180, TL20, M12X1.75.
- AX MAXLE STLTH REAR L174 TL20 M12X1.75 describes a 174 mm axle with a 20 mm thread length and an M12 x 1.75 thread.
- SRAM lets frame designers request a custom Maxle for their own dropouts and makes them responsible for compatibility between frame and custom Maxle.
- SRAM's frame specification gives the thread for its standard Maxle sizes.
- SRAM's rear frame drawing places the hub's OLD between the two dropouts, with the axle passing through both.
- A thru-axle hub's width is measured across its outer faces, the ones that sit against the inside of the dropouts.
- SRAM's fork specification gives M15 x 1.5 for its standard 15 mm Maxle and M12 x 1.5 for its 12 mm Maxle.
- Shimano defines O.L.D. as Over Locknut Dimension.
- Shimano lists its 12 mm E-THRU rear hubs by O.L.D. of 142, 148 and 157 mm, each marked for the matching 142 x 12, 148 x 12 or 157 x 12 thru axle.
- Shimano E-THRU SM-AX720-142x12: 142 x 12, M12 x 1.5, length 163 mm.
- Shimano E-THRU AX-MT700-142x12 and AX-MT500-142x12: 142 x 12, M12 x 1.5, length 166 mm.
- Shimano E-THRU SM-AX56: 142 x 12, M12 x 1.5, length 171 mm.
- Shimano E-THRU AX-MT700-148x12 and AX-MT500-148x12: 148 x 12, M12 x 1.5, length 172 mm.
- Shimano E-THRU SM-AX56-B: 148 x 12, M12 x 1.5, length 177 mm.
- Shimano marks the E-THRU AX-MT700-157x12 for both 148 x 12 and 157 x 12: M12 x 1.5, length 181 mm.
- Shimano marks the E-THRU AX-MT500-157x12 for 157 x 12 only: M12 x 1.5, length 181 mm.
- Shimano's SAINT SM-AX80 is marked for 135 x 10, 135 x 12 and 150 x 12, with an M10 x 1.00 thread in its 10 mm version and M12 x 1.75 in its 12 mm version.
- Shimano lists M12 x 1.5 for every E-THRU axle it marks for 142, 148 or 157 x 12 hubs.
- Shimano lists three E-THRU axle lengths for 142 x 12 hubs: 163, 166 and 171 mm.
- Shimano lists one length per E-THRU axle model, with no fit range.
- Shimano's E-THRU SM-AX720-100x12 is marked for 100 x 12: M12 x 1.5, length 121 mm.
- The E-THRU table is in version 2.7 of Shimano's 2026-2027 spec handbook, dated Sep. 17, 2026.