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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 09-18-10, 11:59 PM   #1
Sebster
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700c. Rear vs. 27" front?

Newb here, used search function, be easy on me.

My first fixed build (late 70s/early 80s Raleigh Grand Prix - don't hate on low end) is mostly complete.

However, I'm running a suicide hub right now, and everything is working ok, just put on some loctite and rotafixed, heard a lot of mixed things ("cog will never come off even with excessive skidding" to "use both brakes or die!").

I'm sure the smart people of BFSSFG will say track hub or die, but I'm not sure about buying this Vuelta 700c Rear Wheel for $50. Would having a smaller rear than front just be really weird? Would this compromise my bottom bracket height a whole lot (using 165s, but when on wrong side of pedals, clips scrape often.

Thanks a lot in advance! Here's a picture of the bike to keep you satisfied (hopefully)
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Old 09-19-10, 12:14 AM   #2
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Buy a pair of 700c wheels... the bike's geometry will remain intact.

If you set up a suicide hub properly and let the loctite cure things should be fine although I'd run a rear brake as insurance.

Nice to see that you have your front brake mounted on the proper side as well...

The Grand Prix is a nice riding bike and solid as all get out... and it looks good.
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Old 09-19-10, 12:19 AM   #3
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Thanks a bunch for the compliments!
But my question was would just the rear wheel mess up the geometry?
And by the "geometry will remain intact", does that mean pedal strike shouldn't be a problem?

Edit:
Would buy a pair, but
1. NOOO money
2. Would have the replace front brake
3. (Pedal strike mentioned above?)
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Old 09-19-10, 12:25 AM   #4
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If you set up a suicide hub properly and let the loctite cure things should be fine although I'd run a rear brake as insurance.

Nice to see that you have your front brake mounted on the proper side as well...
I agree with all of the above. Changing ONLY the rear wheel won't mess anything up. The wheel will be slightly smaller, but if you get a wide enough tire it might actually be the same overall diameter.
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Old 09-19-10, 12:27 AM   #5
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Thanks for the input guys, think I'll just run this setup to the ground, then when I get funding to start a legitimate fixed build (Pursuit tarck ftw), I'll buy a decent wheelset
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Old 09-19-10, 12:58 AM   #6
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A new rear with a slightly higher volume tyre is a good idea... putting a smaller wheel in the back would slacken the head angle but a different tyre might overcome that.

The GP is a pretty relaxed road bike and a little slacker head angle might not even be noticed... the bb clearance won't change by any noticeable degree as it is only a 4mm difference between the rims.
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Old 09-19-10, 07:16 PM   #7
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yeah while your at it get some new tires too yours look pretty good and dry rotted.
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Old 09-20-10, 12:36 AM   #8
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yeah while your at it get some new tires too yours look pretty good and dry rotted.
That's funny, replaced em yesterday
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Old 09-20-10, 01:31 AM   #9
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I've been riding a Peugeot with a 700c rear wheel and a 27in front for 3 months. Aesthetics aside, I think its fine.
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Old 09-20-10, 06:15 PM   #10
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I've been riding a Peugeot with a 700c rear wheel and a 27in front for 3 months. Aesthetics aside, I think its fine.
So it does look weird? Picture please
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Old 09-21-10, 11:15 AM   #11
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Sounds like those mountain bikes with the 26" rear and 29" front. Looks goofy, but accelerates and handles well, while the larger front wheel rolls a little smoother over bumps than a smaller wheel would
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Old 09-21-10, 02:55 PM   #12
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Sounds like those mountain bikes with the 26" rear and 29" front. Looks goofy, but accelerates and handles well, while the larger front wheel rolls a little smoother over bumps than a smaller wheel would
Not quite. A 700c wheel and a 27" wheel are only 8mm different in diameter. A 26" MTB wheel and "twenty-niner" wheel (same as 700c) are 63 mm different, about 2.5 inches. I doubt even a trained eye could see the difference between a 27" up front and a 700c in back.
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Old 09-21-10, 03:27 PM   #13
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Sounds like those mountain bikes with the 26" rear and 29" front. Looks goofy, but accelerates and handles well, while the larger front wheel rolls a little smoother over bumps than a smaller wheel would

Yes but the entire idea of a 29er is having a larger rolling diameter. I mean, it works and it looks goofy. Thats about all there is to it. I really dont believe there is any benefit besides people looking and going *huh?*
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Old 09-21-10, 03:45 PM   #14
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Yes but the entire idea of a 29er is having a larger rolling diameter. I mean, it works and it looks goofy. Thats about all there is to it. I really dont believe there is any benefit besides people looking and going *huh?*
Also you get to call it a 69er.

Giggle.
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