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Sizing cross bikes.(6 posts)

Sizing cross bikes.helton
Dec 17, 2002 12:06 PM
Wanting to buy a cross frameset..Have been riding a 66cm road bike with a 61cm top tube..How would I size a cross bike? I saw that surly is coming out with a 29" wheel mountain bike called the karate monkey, that has a 24.5" top tube with a 22" seat tube..Do any of you guys think that would be in the ball park? I remember some of you guys like the surly frameset..By the way, I am 6'5"..Any input would be appreciated.....Steve.
re: Sizing cross bikes.jrm
Dec 17, 2002 2:11 PM
i ended up riding a CX frame with the same TT lenght as the roadie it replaced. It s a bit taller and offers less standover but you dont need standover when your riding.
Ditto (nm)Look381i
Dec 18, 2002 3:42 AM
re: Sizing cross bikes.mackgoo
Dec 18, 2002 6:02 AM
I agree too. I don't race I just blast around for winter fitness so I don't loose much for the road season.
Any way I did the classic 1cm smaller on all the standard measurements with the exception of the bars, one size wider. The bar size is a good choice. I stayed with the 1cm (basically) shorter stem/tt combo. Next year I'm going to my road length, I'll be more comfortable on the road and I don't think it will be detremental off road.
So my non racing experience is stick with road sizing.
I was going to say I was thinking about a size smaller fram for center of gravity and getting it lower but I don't think that is true. You are the center of gravity so regardless of frame size to a degree the seat height will be the same wich will keep the center of gravity pretty much the same.
re: Sizing cross bikes.tihipscrew
Dec 18, 2002 6:21 AM
I race cx and my cx frame is identical to my road frame. No problems. Yes, there's less seatpost showing by maybe 1/2 inch, but unless you're on the very biggest road frame you can ride, I'm doubting you'll have a problem w/ a similar sized cx bike.
re: Sizing cross bikes. leggyatpjunkie
Jan 3, 2003 6:26 PM
a 66 roadie with a 61c TT? you must have long legs and a short torso. standard wisdom would say go with identical TT length in a cx bike which will put you (most likely) on a 61 or 62 cx bike. this will give you about an extra 1.5 inches of standover. This is about perfect for offroad use whether racing or not. The last thing you want is to try to step off on a narrow piece of single track with a drop off. You are going to want the jewel room. good luck.