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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 01-05-09, 12:18 AM   #1
sbsplease
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Upgrade from 27" wheels to 700c make a difference in standover height?

Hi, I'm planning on building an old 10 speed road bike to a fixed gear, but most of them have 27" wheels but I want 700c. I was wondering if upgrading the wheel size will change the overall standover height? I found a 21" frame, that's about a 53 I think, I know my ideal frame size is 56, I'm 5'10" and my inseam is a 32, so should I still go get a 56 frame or stay with the 53? Sorry if this question was asked already, i tried searching on the forum but couldn't find a straight answer. Cheers everyone

Last edited by sbsplease; 01-05-09 at 02:40 PM. Reason: wrong info 21 frame not 22
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Old 01-05-09, 12:32 AM   #2
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your bike will sit 4mm lower.
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Old 01-05-09, 12:39 AM   #3
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First off, a 22" frame is 56 cm, as 1 centimeter is 2.54 cm; Google also has a unit converter you can use if you don't feel like thinking. Therefore, your question is effectively null; try using that frame.

However, seat tube length and its related quantity standover height aren't alone the determinants of bike fit; top tube length is also significant. On most bikes, a 56 cm frame has a top tube length of about 54cm, but some 56cm frames have 56 cm top tubes, which you may find too large. Generally, it's good to test ride a bike, but if you're dealing with old 10 speeds, they're cheap enough that trial and error may be viable.

Standover height is determined by the combination of frame size and overall wheel diameter. Assuming similar tires, 700c would result in slightly reduced standover height, as well as bottom bracket clearance. This would only be by a few millimeters, however.
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Old 01-05-09, 12:44 AM   #4
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Originally Posted by AlanKHG View Post
First off, a 22" frame is 56 cm, as 1 centimeter is 2.54 cm; Google also has a unit converter you can use if you don't feel like thinking. Therefore, your question is effectively null; try using that frame.

However, seat tube length and its related quantity standover height aren't alone the determinants of bike fit; top tube length is also significant. On most bikes, a 56 cm frame has a top tube length of about 54cm, but some 56cm frames have 56 cm top tubes, which you may find too large. Generally, it's good to test ride a bike, but if you're dealing with old 10 speeds, they're cheap enough that trial and error may be viable.

Standover height is determined by the combination of frame size and overall wheel diameter. Assuming similar tires, 700c would result in slightly reduced standover height, as well as bottom bracket clearance. This would only be by a few millimeters, however.
your bike will sit 4mm lower.
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Old 01-05-09, 07:12 AM   #5
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Originally Posted by ianjk View Post
your bike will sit 4mm lower.
Assuming the same tire width/height.
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Old 01-05-09, 09:06 AM   #6
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Flip side, you'll get much stronger wheels.
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Old 01-05-09, 02:39 PM   #7
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Sorry I forgot to edit that the frame was a 21 not a 22, so technically it is a size 53, i'll correct that right now.
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