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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 12-03-11, 07:04 PM   #1
FakeFuji
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650c up front

No, I don't want to do barsp1nz, my fork and front wheel were recently destroyed and I was wondering if anyone who had switched their front wheel out for a smaller(650) wheel up front would want to chime in with any ups and downs of this
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Old 12-03-11, 07:07 PM   #2
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You can't use a front brake with a standard 700c fork.
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Old 12-03-11, 07:10 PM   #3
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I've run 26" up front, 700c in back. Makes HTA and STA steeper and BB lower.

How well it works will depend on how steep your bike's stock angles are and how much steeper you like them.

If you're good with Trig you can calculate what the new angles will be on paper.

EDIT: Oh, yeah, I have Mega long reach calipers to run 26 on that bike. You'll need so slide your brake pads down about 25mm to reach your new rims. Probably gonna have to shop for long reach brake if you really wanna do this.

I should also add you can run a fatter tire on the front to minimize the steepening and BB lowering effects. Seems like a silly way of going about things unless you get a 650c wheel for free, however.

Last edited by LesterOfPuppets; 12-03-11 at 07:15 PM.
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Old 12-03-11, 07:11 PM   #4
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my fork is trashed also so I'd get the fork to match

edit: BB height is the only thing that has me nervous
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Old 12-03-11, 07:13 PM   #5
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Might as well get a proper fitting fork and wheel. 650c up front = bad idea.
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Old 12-03-11, 07:31 PM   #6
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I can't think of many "ups" to this.
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Old 12-03-11, 07:33 PM   #7
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I can't think of many "ups" to this.
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Old 12-03-11, 07:50 PM   #8
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If you're not doing barspins there aren't really any practical benefits to putting a 650c wheel on a frame that wasn't designed for it. There are a number of frames built to have staggered wheels like that but they have amply high bottom brackets. I think theoretically on the bikes designed for a 650 up front there are aerodynamic and weight advantages. Those benefits would be outweighed on a frame that's not meant for it. IIRC, they don't allow 2 different wheel sizes in racing anymore anyway.
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Old 12-03-11, 08:20 PM   #9
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Old 12-03-11, 09:16 PM   #10
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You can't use a front brake with a standard 700c fork.
...but who needs a brake anyway?
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Old 12-05-11, 08:22 AM   #11
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will totally screw up the geometry, handling and aesthetics of the frame. what else do you need to know?
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Old 12-05-11, 02:45 PM   #12
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The major issue with it though is it will f**k up the trail of your bike

it'll handle obnoxiously twitchy, and will discourage you from riding fast.

that being said, ive had a bike with a 650c front, and didn't mind it by any means for my around town beating, and it made my bikes angles a bit more attractive.
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