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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 09-13-10, 04:46 PM   #1
Collin2424
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126mm wheelset work in a track frame?

Hello!

I hope this isn't too much of a dumb question. If it is, I'll feel even dumber knowing that I was unable to answer my own question with the searches I tried!

So I've built a few singlespeed bikes and I'm ready for a fixed gear track bike to take to the local velo. I've got a proper track frame that's spaced at 120mm and I have a wheelset I was planning on using (Mavic GP4's with Mavic hubs) and the rear is 126mm. Can I simply replace the axle with a 120mm axle? I've replace the axle on a few different road hubs, but it was always with the same size. I guess the better question is, how does an actual "track hub" differ from a "road hub?" If it's just axle length, I think this wheelset will be awesome for my intended purpose.

Thanks a million for your help! Looking forward to riding this bad boy

-Collin-
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Old 09-13-10, 05:05 PM   #2
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A rear road hub is designed to accept a cassette on a freehub and has a hollow axle. Older road hubs used screw-on freewheels. Track hubs are designed to accept a screw on fixed cog and a lockring, and have a solid axle. You need a track hub for use on the track. If you actually have a track hub spaced at 126mm, then its a simple matter to remove 3mm worth of spacers on each side to change it to 120mm spacing. You cannot use a road hub on the track. You can, however, use a road front hub with a hollow axle on the track if you replace the quick release with a bolt-on skewer.
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Old 09-13-10, 05:19 PM   #3
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A rear road hub is designed to accept a cassette on a freehub and has a hollow axle. Older road hubs used screw-on freewheels. Track hubs are designed to accept a screw on fixed cog and a lockring, and have a solid axle. You need a track hub for use on the track. If you actually have a track hub spaced at 126mm, then its a simple matter to remove 3mm worth of spacers on each side to change it to 120mm spacing. You cannot use a road hub on the track. You can, however, use a road front hub with a hollow axle on the track if you replace the quick release with a bolt-on skewer.
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Old 09-13-10, 05:34 PM   #4
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Old 09-13-10, 06:10 PM   #5
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Brain grenade!!!
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Old 09-13-10, 08:06 PM   #6
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Got it. Mine takes a thread-on freewheel, so I figured a thread-on cog and lock ring would work fine. Then I figured it would just be a matter of replacing the hollow quick-release axle with a solid axle. Oh well, it was worth a try because I really like this wheelset. Thanks for clarifying nonetheless.

-Collin-
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Old 09-16-10, 02:28 AM   #7
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Scroll about half way down to new wheels vs. old wheels.
http://www.sheldonbrown.com/deakins/...onversion.html
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Old 09-16-10, 03:47 AM   #8
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BTW, you're going to want an axle length longer than 120—otherwise your wheels are just gonna fall off.
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