Go Back  Bike Forums > Bike Forums > Cyclocross and Gravelbiking (Recreational)
Reload this Page >

Thru axles and standard sizes - a cautionary tale

Notices
Cyclocross and Gravelbiking (Recreational) This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like : "Unbound Gravel". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

Thru axles and standard sizes - a cautionary tale

Old 09-09-22, 02:30 PM
  #1  
msu2001la
Senior Member
Thread Starter
 
msu2001la's Avatar
 
Join Date: Mar 2006
Location: Midwest
Posts: 2,311
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 1108 Post(s)
Liked 1,111 Times in 656 Posts
Thru axles and standard sizes - a cautionary tale

I somehow managed to strip out the allen bolt head on one of my thru-axles. (yes... user error) Thankfully the stock thru-axle has a 5mm head on both sides, so I was able to unscrew it from the other side. I figured this should be replaced (you know... before I do the same thing to the other side), so I dial up the interwebs and type in 12x100mm thru axle and find a bunch of results. I'm about to smash the buy button on some random Amazon listing, when I notice there are different actual lengths, oh and also different thread pitches, different spacers/washers, etc. Wow.

Anyway, specs on thru-axles aren't particularly easy to find online. I found this website: https://robertaxleproject.com/ that seems like a good option, made in USA. They've got a tool that will help determine exactly what size thru-axle you need. I also learned during this process that if you pull out the thru axle, it probably has printing on it that indicates the actual size, and thread pitch. Also worth noting that my front and rear axles have different thread pitches, and the rear uses a conical washer, where the front uses a flat washer.

TLDR; if you need a new thru axle, be sure to confirm size and maybe ask your LBS for specs before buying, or check out Robert Axle Project.
msu2001la is offline  
Old 09-09-22, 02:57 PM
  #2  
mschwett 
please no more flats
 
Join Date: May 2021
Location: San Francisco
Posts: 1,135

Bikes: aethos, creo, vanmoof, public ...

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 635 Post(s)
Liked 749 Times in 401 Posts
Originally Posted by msu2001la View Post
I somehow managed to strip out the allen bolt head on one of my thru-axles. (yes... user error) Thankfully the stock thru-axle has a 5mm head on both sides, so I was able to unscrew it from the other side. I figured this should be replaced (you know... before I do the same thing to the other side), so I dial up the interwebs and type in 12x100mm thru axle and find a bunch of results. I'm about to smash the buy button on some random Amazon listing, when I notice there are different actual lengths, oh and also different thread pitches, different spacers/washers, etc. Wow.

Anyway, specs on thru-axles aren't particularly easy to find online. I found this website: https://robertaxleproject.com/ that seems like a good option, made in USA. They've got a tool that will help determine exactly what size thru-axle you need. I also learned during this process that if you pull out the thru axle, it probably has printing on it that indicates the actual size, and thread pitch. Also worth noting that my front and rear axles have different thread pitches, and the rear uses a conical washer, where the front uses a flat washer.

TLDR; if you need a new thru axle, be sure to confirm size and maybe ask your LBS for specs before buying, or check out Robert Axle Project.
robert axle project is great. bought a few through axles from them with 100% satisfaction.
mschwett is offline  
Likes For mschwett:
Old 09-09-22, 03:31 PM
  #3  
Polaris OBark
ignominious poltroon
 
Polaris OBark's Avatar
 
Join Date: Jan 2022
Posts: 2,290
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 1311 Post(s)
Liked 1,914 Times in 1,054 Posts
If they don't list your bike on the website, they have actual friendly and helpful humans, too.

(Almost makes me want to move to Bend, but I saw a bumper sticker that says it sucks and not to move there.)
Polaris OBark is offline  
Old 09-09-22, 06:50 PM
  #4  
rosefarts
With a mighty wind
 
Join Date: May 2015
Posts: 2,195
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 872 Post(s)
Liked 611 Times in 364 Posts
Originally Posted by Polaris OBark View Post

(Almost makes me want to move to Bend, but I saw a bumper sticker that says it sucks and not to move there.)
I saw that bumper sticker literally today.
rosefarts is offline  
Likes For rosefarts:
Old 09-10-22, 03:58 AM
  #5  
Badger6
Obsessed with Eddington
 
Badger6's Avatar
 
Join Date: Jun 2013
Location: Brussels (BE) 🇧🇪
Posts: 1,329

Bikes: '16 Spesh Diverge, '14 Spesh Fatboy, '18 Spesh Epic, '18 Spesh SL6, '21 Spesh SL7, '21 Spesh Diverge...and maybe n+1?

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 531 Post(s)
Liked 620 Times in 368 Posts
Originally Posted by msu2001la View Post
...check out Robert Axle Project.
Shortened it even more! Theyíre so great, Iíve even replaced stock axles with theirs when I didnít really need to. 100% support this content, check them out.
Badger6 is offline  
Old 09-10-22, 06:57 AM
  #6  
WhyFi
Senior Member
 
WhyFi's Avatar
 
Join Date: Jan 2010
Location: TC, MN
Posts: 39,330

Bikes: R3 Disc, Haanjo

Mentioned: 353 Post(s)
Tagged: 1 Thread(s)
Quoted: 20610 Post(s)
Liked 9,279 Times in 4,595 Posts
Yup. I came across RAP (and the multiple TA lengths and thread pitches) a handful of years ago when I was in need of a TA for a wheel-on trainer. I went back to them when my new-at-the-time bike came with some ****** quick release TAs and I wanted to replace them with conventional TAs.
WhyFi is offline  
Old 09-10-22, 12:15 PM
  #7  
Paul Barnard
For The Fun of It
 
Paul Barnard's Avatar
 
Join Date: May 2007
Location: Louisissippi Coast
Posts: 5,526

Bikes: Lynskey GR300, Lynskey Backroad, Litespeed T6, Lynskey MT29, Burley Duet

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 1916 Post(s)
Liked 1,337 Times in 681 Posts
I am glad thru-axles have become the norm in the industry. With all the problems QR axles had you know.
Paul Barnard is offline  
Old 09-11-22, 02:11 PM
  #8  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 23,128
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 2,706 Times in 1,883 Posts
I fail to understand why they didn't come up with a through axle standard. I guess I understand the different lengths to some extent, given that they are part of the frame/fork. But still, they could have agreed on a thread pitch.
unterhausen is offline  
Likes For unterhausen:
Old 09-11-22, 06:57 PM
  #9  
msu2001la
Senior Member
Thread Starter
 
msu2001la's Avatar
 
Join Date: Mar 2006
Location: Midwest
Posts: 2,311
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 1108 Post(s)
Liked 1,111 Times in 656 Posts
Originally Posted by unterhausen View Post
I fail to understand why they didn't come up with a through axle standard. I guess I understand the different lengths to some extent, given that they are part of the frame/fork. But still, they could have agreed on a thread pitch.
Agreed. It also seems crazy to me that my front and rear axles have different thread pitches.

Reminds me of a story someone once told me about a 1980's era Ferrari where the shop discovered that a body panel on the drivers' side used metric sized hardware, but the identical part on the passenger side was all threaded for imperial size bolts.
msu2001la is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.