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Track fork replacement - 700 to 650?

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Track fork replacement - 700 to 650?

Old 07-27-07, 08:53 PM
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HereNT
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Track fork replacement - 700 to 650?

So I posted this in the framebuilder's forum, too, but I have the feeling it will get a few more views here:

Hi - I'm hoping you guys can answer this question:

I have a late 80s bianchi track bike that I would like to put a new fork on and run a brake. Right now, the fork is bent a little, but it started out with no room between the crown and the wheel, and little or no rake.

I am wondering if it would make any sense to build the fork for a 650 wheel? It seems like this would let me keep the handling and angles pretty close to the same, but have some more room for a brake. It would also get rid of the little bit of toe overlap that I have (it's a 58cm frame.)

I'm probably going to be having someone local make me a fork, I just want to check whether this idea is totally crazy before calling someone up...
Any other streetrack riders thought of doing something like this? I'm barely riding her right now because of the fork being bent back to a slightly negative rake. I aligned the dropouts so it tracks straight, but really I want to get a new fork anyways. My days of brakeless riding are pretty far behind me, so I really want to be able to put a brake on. It's not that I don't have the skills, I just don't feel like putting my knees through that kind of punishment anymore...
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Old 07-27-07, 09:57 PM
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stewardmike03
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Naw...just get a decent road fork. The difference in geometry is negligible on the street. You may even find something that matches the bike!
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Old 07-27-07, 11:32 PM
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Igneous Faction
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I fail to see how a smaller fork will give you more room for a brake and keep the handling the same... You'll be changing the angle of the headtube. Why not just buy a road fork or one of the many "track" forks available with drilled crowns?
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Old 07-28-07, 08:39 AM
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bonechilling
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This can be done, but I don't really see why you'd want to. I can't imagine that toe overlap is so great on a 58cm frame that you'd need a solution so drastic. I'm guessing what he's talking about is not a regular 650c fork on a 700c frame, but one that was built to compensate for the difference between 650c and 700c. Sort of like those old Centurions that had the 24" front wheel and the 700c rear.



But yeah, if you want to run a brake, just buy one of the numerous road or track forks that are already drilled for a brake.
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Old 07-28-07, 03:38 PM
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Cool - I wasn't sure how much the handling would change. I want to keep the front axle in pretty close to the same position, that's why I was thinking the smaller wheel. It wouldn't be a shorter fork, just a smaller wheel so that the brakes would fit.

Anyways, random thing I was thinking of...
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Old 07-28-07, 03:41 PM
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People do that (650b wheel, 700c fork) a fair amount to gain tire clearance. It's totally doable and it works. http://sheldonbrown.com/650b.html Alternatively and more cheaply you can keep searching for a very tight clearance brake caliper. People on this forum must know a few good possibilities.
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