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  1. #1
    CS2
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    Cross Check Question for the Experts

    I'm thinking about pulling the trigger on 54CM CC. My only concern is how much is the stand over height going to increase going from stock tires to 700C x 40 or 42? Surly rates it at 31.2" with 32 tires. I would say 32" stand over or more would leave virtually no room to speak of.
    1982, 1983, 1984, 1985, 1986, 1992 Stumpjumpers. 1995 Waterford 1200, 1999 Waterford RSE, plus a garage full of steel frames.

  2. #2
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    I've gone from 32's to 40's and, granted i have a decent amount of stand over, it is a hardly noticeable jump in TT height. If you want your bars raised up anywhere around saddle height, i'd vote for the larger sized CC.

  3. #3
    CS2
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    Quote Originally Posted by rjwall View Post
    I've gone from 32's to 40's and, granted i have a decent amount of stand over, it is a hardly noticeable jump in TT height. If you want your bars raised up anywhere around saddle height, i'd vote for the larger sized CC.
    Typically I a road bike with a 22" TT. The 54 is close.
    1982, 1983, 1984, 1985, 1986, 1992 Stumpjumpers. 1995 Waterford 1200, 1999 Waterford RSE, plus a garage full of steel frames.

  4. #4
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    So just doin' some beer math here... Your 40mm tire is 8 mm wider than the stock 32, which makes it 4 mm wider on each side. If it has a round profile, that 4 mm is the increase in radius, so it will also be 4 mm taller than stock. 4 mm being .4 cm or less than a quarter inch. I don't think your stand over is going get up to 32". You're good.

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    I don't notice a change in standover on my 54 moving between 32 and 45mm tires.

  6. #6
    CS2
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    Quote Originally Posted by HardyWeinberg View Post
    I don't notice a change in standover on my 54 moving between 32 and 45mm tires.
    I would have thought there had to be some increase in the stand over. I'm glad I asked.
    1982, 1983, 1984, 1985, 1986, 1992 Stumpjumpers. 1995 Waterford 1200, 1999 Waterford RSE, plus a garage full of steel frames.

  7. #7
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    Don't worry about the standover, get the 54. I still regret getting a 52 on the advise of my lbs. It felt good at first, til I mounted fat tires on it to ride singletrack. The toe overlap put me over the bars a couple times. I have learned to ride around it, but still have to watch it on tight trails or with the fenders on it for touring.

  8. #8
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    Quote Originally Posted by CS2 View Post
    I would have thought there had to be some increase in the stand over. I'm glad I asked.
    There is an increase that can be determined w/ calipers etc..., it just doesn't come into play, functionally. You're only dealing with millimeters. Bolandjd's approximation matches my math but good luck measuring that accurately 2 times out of 3 out on the sidewalk.

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