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RE: can i use 700 in the reas and 650 in the front
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by mikef on May 13, 2007
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years ago, probably late 80's, I would see this type of set up on occasion. people w/ 700 bikes would run this combination for a lower front end profile. Not sure how effective it really was. Don't see it anymore.
PS, it's not a dumb question..
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RE: can i use 700 in the reas and 650 in the front
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by LSW on May 13, 2007
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Not a dumb question, as Mike points out. The equipment configuration of using a smaller wheel in the front used to slangly be called a "funny bike". Back in the 90's, riders who experienced difficulty in achieving a low, flat-back, aero position due to physical limitations with their back or whatever, would sometimes experiment with a smaller front wheel to drop "their front end" a little. Some cyclists even went to a 24" front wheel.
I believe the UCI outlawed the configuration for sanctioned cycling (TT) events by passing stricter equipment specifications during the latter part of the 90's.
I don't believe that USAT currently has any rule that would prohibit use of a smaller front wheel in sanctioned muiltisport events.
Check the USAT rulebook under section 5.11.g:
(g) Except as otherwise determined by the race director in the interest of safety, the front wheel may be of a different diameter than the rear wheel, but the front wheel must be of spoke construction. The rear wheel may be either spoke or solid construction. Wheel covers shall only be permitted on the rear wheel.
You might encounter a cranky official who could claim there was a safety issue, but it doesn't really appear to be illegal otherwise.
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RE: can i use 700 in the reas and 650 in the front
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by draftdodger on May 13, 2007
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Can I use a 650 in the rear and a 700 in the front? Is this a dumb question?
Personally I like the look of the bikes in the original NOT dumb question.
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RE: can i use 700 in the reas and 650 in the front
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by twister on May 14, 2007
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My take is that more than a dumb question (which I tend agree - it isl) it is a dumb bike setup. unless we are back in the 80-90's. but then again, it was dumb even then. hell, now it might actually be stupid in my book. I mean, who wants to carry 2 types of tubes - and look dumb doing it.
as for being illegal - I believe it would be. UNLESS you have an old school 'funny bike' built for this setup, and have the gonads to show up and race it in your white tube socks, and you tried to put a 650 on a 700 frame - you would have a non-working front brake. which is.... illegal.
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RE: can i use 700 in the reas and 650 in the front
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by obglide on May 14, 2007
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Yes, you can. Use a 650c fork too. Both your seat tube and head tube angles will be steepened. Your trail will decrease (more twitchy), so try to pick a fork with less offset to compensate.
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RE: can i use 700 in the reas and 650 in the front
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by mikef on May 15, 2007
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Let's forget about the question itself and talk about the concept of referring to someones's question as stupid. Someone came here asking for help.
why not be a decent person and just sidestep the question if you feel it's beneath you?
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RE: can i use 700 in the reas and 650 in the front
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by draftdodger on May 18, 2007
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In the July/August issue of Road Bike Action there is an example of this type of bike on page 60. It's a Pinarello with a forward sloping top-tube. There's also an interview with Michellie Jones.
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RE: Can I use 700 in the rear and 650 in the front
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by ddddddd on May 18, 2007
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Several companies also make their women's frames with this configuration. Smaller frames require the front wheel to be smaller so the riders shoe doesn't get clipped by the front wheel when cornering. My wife rode a KHS tri bike for several years with this set-up. I rode a larger version of the same bike with 700 front & rear. The only drawback to her set-up was the need to carry both size tubes on every training ride.
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