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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)

View Poll Results: 650 or 700
650 3 30.00%
700 7 70.00%
Voters: 10. You may not vote on this poll

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Old 04-26-14, 02:54 PM   #1
DrFx
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help really appreciated 650c tires on Dawes sst 52cm from BD

Hi everyone im new here and i purchased a BD Dawes sst i love the bike but noticed i have
some toe overlap. Now i wanted to purchase new 650c wheelsets.
Is this a bad idea i feel the smaller wheelsize will give me a better fit.
some of my concerns are what is the diameter of this wheel size?
Will the smaller wheel size make the stock brakes useless?
Im sorry if thisbsounds silly but i appreciate all your feedback!
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Old 04-26-14, 03:50 PM   #2
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Not a good idea. A 650c wheel has a diameter approximately 2" smaller than a 700c wheel, such that the brakes will need to reach another 1" for the brake block to be centered on the rim braking surface. So, much longer reach brake calipers would be required. Also, the handling would be significantly affected due to the change in steering geometry caused by the smaller tire diameter. Finally, the bottom bracket height will be reduced by 1", which will greatly increase the risk of pedal strike when pedalling through corners. You just need to learn how to deal with toe overlap, or buy another bike with less track like geometry that doesn't have any overlap.
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Old 04-26-14, 04:11 PM   #3
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Why is this a poll? There isn't one person here who will advise you to foolishly put 650c tires on a bike designed for 700c.
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Old 04-26-14, 08:24 PM   #4
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Not a good idea. A 650c wheel has a diameter approximately 2" smaller than a 700c wheel, such that the brakes will need to reach another 1" for the brake block to be centered on the rim braking surface. So, much longer reach brake calipers would be required. Also, the handling would be significantly affected due to the change in steering geometry caused by the smaller tire diameter. Finally, the bottom bracket height will be reduced by 1", which will greatly increase the risk of pedal strike when pedalling through corners. You just need to learn how to deal with toe overlap, or buy another bike with less track like geometry that doesn't have any overlap.
Thanks for the help so if i were to put 650c wheels i would also have to change the cranks and install longer reach callipers? Why is steering affected? Also why is this wheel size so disliked?
Thanks for the response trackie guess ill just deal with it
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Old 04-26-14, 08:27 PM   #5
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Actually i was going to encourage OP to buy a good 650c wheelset and provide my email address. Happy to take them off his hands on the cheap. Or maybe TT will beat me to it. We both have 650c fixed geared bikes
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Old 04-26-14, 08:31 PM   #6
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Why is this a poll? There isn't one person here who will advise you to foolishly put 650c tires on a bike designed for 700c.
Ooooo, that makes it soooo tempting.

Toe overlap isn't a huge issue DrFx. Sure, if you've got the choice, and it means something to you, choose not to have it but you have a good bike now, don't mess with things on the grounds of toe overlap.

In normal riding, if you ever turn the wheel far enough for toe overlap to be an issue, you've already fallen off. In very slow speed riding and tight manoevering though, it is possible that the two will overlap at some point. However, it's only for a short period and you are traveling slow enough to anticipate and avoid any problem. Seriously.

Still tempted to vote 'yes'
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Old 04-26-14, 09:31 PM   #7
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Why is steering affected?
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Old 04-27-14, 09:21 AM   #8
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Thanks for the help so if i were to put 650c wheels i would also have to change the cranks and install longer reach callipers? Why is steering affected? Also why is this wheel size so disliked?
Thanks for the response trackie guess ill just deal with it
Changing cranks won't help. Putting small wheels in a frame meant for larger wheels will lower the bike to a point that even with short cranks it's more likely to pedal strike
Yes you'd need different calipers
650c isn't disliked when used on a frame built for that size wheel.

You are not the first person to think of this or ask. Yes it'll work with enough modification, but it won't work like the intended part and isn't worth the headache. If you don't like toe overlap (perhaps if you shared your reasoning we could help with the specific issue it's causing) swap for a different frame.
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Old 04-27-14, 09:25 AM   #9
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To hell with logic, physics, science, advice, economics and all the related crap. DrFx should just go ahead and do it!
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Old 04-27-14, 09:59 AM   #10
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Trail will be reduced by over ten percent. If the bike handles "perfectly" now, it will become a twitchy mofo. If it's a twitchy mofo now, it'll become scary as hell.
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Old 04-27-14, 05:00 PM   #11
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To hell with logic, physics, science, advice, economics and all the related crap. DrFx should just go ahead and do it!
I've come to really love this place. I bet my IQ has dropped 10 pts just from reading the forum Which may put me into the negative numbers.
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Old 04-28-14, 01:40 AM   #12
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Trail will be reduced by over ten percent. If the bike handles "perfectly" now, it will become a twitchy mofo. If it's a twitchy mofo now, it'll become scary as hell.
Maybe we should all vote 'do it provided he provides a video of the results'
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