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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 08-12-07, 06:50 PM   #1
br995
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650s on a 700 frame?

Besides looking silly (and not being able to brake) is there any serious reason not to run 650 wheels on a frame designed for 700s? A lower bottom bracket is the only real problem I can think of.

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Old 08-12-07, 07:25 PM   #2
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You pretty much have it all covered. Also remember that it's more of a pain to find 650 tires.
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Old 08-12-07, 07:26 PM   #3
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And rims. But you get all kinds of fender clearance!
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Old 08-12-07, 10:26 PM   #4
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650 = barspins.
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Old 08-12-07, 10:29 PM   #5
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650 = barspins.
Barspins = ****ing stupid.
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Old 08-12-07, 10:33 PM   #6
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Hating = ****ing stupid. Grow up, let other people have fun.
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Old 08-12-07, 10:35 PM   #7
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Hating = ****ing stupid. Grow up, let other people have fun.
Oh blah. Buy a BMX bike.
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Old 08-12-07, 10:38 PM   #8
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You'll be dropping your BB by around 2.5cm,
Bad idea unless you're running 140mm cranks.
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Old 08-12-07, 10:54 PM   #9
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i have a 650 wheel/fork and its not all that noticeable.
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Old 08-12-07, 11:09 PM   #10
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What about a 650 front wheel/fork and a 700 rear wheel?
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Old 08-12-07, 11:09 PM   #11
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pursuit?
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Old 08-12-07, 11:18 PM   #12
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What about a 650 front wheel/fork and a 700 rear wheel?
You could put one on there, but why bother? Do you want to carry around two different types of tubes or otherwise inconvenience yourself?
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Old 08-12-07, 11:29 PM   #13
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Why stop there? Why not run 20s?

Best reason- you probably will start a ridiculous copycat fad, in six months everyone will be doing it.
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Old 08-12-07, 11:36 PM   #14
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Oh blah. Buy a BMX bike.
go ride a bike and stop worrying.
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Old 08-12-07, 11:51 PM   #15
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Therefore 650 = hating.
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Old 08-13-07, 12:09 AM   #16
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I'm sure this is redundant, but you'll lower your BB by twice as much if you use a 650c fork rather than just slide the 650c in the 700c fork.
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Old 08-13-07, 12:25 AM   #17
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changing one wheel (and or fork) wouldnt do it nearly as much as both wheels
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Old 08-13-07, 12:26 AM   #18
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Quote:
Originally Posted by br995 View Post
Besides looking silly (and not being able to brake) is there any serious reason not to run 650 wheels on a frame designed for 700s? A lower bottom bracket is the only real problem I can think of.
Not being helpful at all: I went the opposite way with 1.5 of my bikes. Got higher BB in one case and steeper front in .5 case.
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Old 08-13-07, 12:49 AM   #19
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ht and st angles get a little bigger... not sure by how much though
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Old 08-13-07, 01:02 AM   #20
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Quote:
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ht and st angles get a little bigger... not sure by how much though
Not at all. By changing both wheels, you are just moving the frame 2.5cm lower, still parallel to the ground. The front trail gets affected, though.
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Old 08-13-07, 08:39 AM   #21
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Umm, are we talking about 650B or 650c?
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Old 08-13-07, 08:43 AM   #22
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Umm, are we talking about 650B or 650c?
If they were talking about 650B, this thread would be in the Touring forum.
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Old 08-13-07, 08:46 AM   #23
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Fair enough.
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Old 08-13-07, 10:21 AM   #24
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pursuit?
Only the frame makes it pursuit. Not the wheels you decide to roll with.

I've ridden a 650 spinergy on my KHS aero track. Yes , mostly for barspins and for fun. I wouldn't recommend it for a frame setup for 700s because pedal strike's a *****.

If you plan on doing this for a permanent fix, at least change out your fork.
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Old 08-13-07, 11:43 AM   #25
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Been done before...

I set up an IRO Mark V with 650B wheels. Worked out pretty well. I used some Tektro R556 brakes (an old set of center-pulls will also work).

You don't say in your post whether your using 650C or 650B - I don't know how much difference between the two.

Check out these sites...
http://www.freewebs.com/650b/index.htm
http://www.sheldonbrown.com/650b.html

& a photo...


Good luck!
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