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  1. #1
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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

  2. #2
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    your bike will sit 4mm lower.

  3. #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.

  4. #4
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    Quote 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.

  5. #5
    Senior Member Steev's Avatar
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    Quote Originally Posted by ianjk View Post
    your bike will sit 4mm lower.
    Assuming the same tire width/height.

  6. #6
    The Site Administrator: Currently at home recovering from a couple of strokes,please contact my assistnt admins for forum issues Tom Stormcrowe's Avatar
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    Flip side, you'll get much stronger wheels.
    on light duty due to illness; please contact my assistants for forum issues. They are Siu Blue Wind, or CbadRider or the other 3 star folk. I am currently at home recovering from a couple of strokes. I am making good progress, happily.


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  7. #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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