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I managed to damage the thread on my Trek Crocket DT Swiss rear thru axle (don't ask how), and it no longer tightens as much as it once did. No problem, I'll just order one from Trek. None in stock. No problem, I'll just order a standard one from somewhere else. There's a Giant branded one at a good price, perfect!
Tried to fit it today but it won't screw in, it would appear to have a slightly different thread pitch/depth, bugger!
So, do anyone on here know what DT Swiss 142mm, 12mm rear thru axle I need for a 2020 Trek Crocket cross bike?
It may not be the case, but, quite often there is some small writing on the actual axle that gives you the information that you need. If you’ve damaged the thread on the axle then you’ve probably damaged the thread of where it threads into. This may be a dropout or even a nut that you can remove.
Can you see damage? Sometimes the nut is only held by a very small grub screw and this can slip allowing the nut to turn but never tighten, I’m not familiar with the Crocket!
The dimension and thread pitch should be printed on your old axle. Unfortunately there are three varieties of thread pitch all used by different manufacturers.
This is probably the hanger that you need and it indicates a thread pitch of 1.75. These, and corresponding axles are available from Freewheel or any bike shop (most) with an account for Madison, the importer. Hope this helps
I've a spare dropout I can swap over.
I'll checkout the axle to see if there's writing on it.
Working on my bikes is getting harder every time I get a new one, so many differing standards. I never thought a simple screw in thru axle would have different specs. I'm considering only using bike shops to look after my bikes going forward, let them deal with it.
Yup, it’s crazy. Thankfully one of the side effects of UDH is that thread pitch should be universal, narrowing one of the variables.
This is the writing on the axle.
Is that a picture of the dropout that I posted above? If it is then it’s a 1.75 pitch, measure the complete axle length from below the cap and then measure the length of the threaded bit. These three measurements (plus the 12mm diameter) should give you enough info for a replacement from BETD, Wheels Manufacturing and others. The numbers are probably the Trek part number but I’ll check on DT Swiss for you.
A thread pitch gauge is a pretty cheap tool that, although you won't use it often, doesn't really have an easy alternative. Team it with a cheap vernier caliper and you can determine any thread size.
Like this.
1.75 pitch makes sense as the Giant one I bought apparently has 1.5 and doesn't fit.
I'll check out the Burgtec one but ideally would prefer another DT Swiss one that doesn't require an Allen key.
Thanks.
Sorry, don’t know what’s happening with the double posts! Anyway, if you’re still unsure then give Burgtec a ring in the morning. A very pleasant company..
This may help…
They give you the dimensions for most bikes I’ve checked, even if you just want to attach a wheel.
IGM just beat me to it....