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Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

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Old 12-06-07, 10:16 PM   #1
smurfy
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Different Size Tires

I'm wanting to replace the 30mm Ritchey Speedmax tires on my Bianchi Axis since they are getting worn out. After I saw pics of a Ti Moots 'cross bike with a 44mm tire in the front and a 37mm one in the rear I was thinking of doing this (it looks kinda cool), except I don't have room for tires quite this big so I was going to do a 35 in the front and a 32 in the rear.

Is there much sense in this? I do take my bike off road and it seems to handle very difficult sections quite well, but I would like something to take big hits on rocky "moonscapes". Has anybody else have their cross bikes set up like this?
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Old 12-06-07, 11:16 PM   #2
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Cross bikes aren't meant to take "big hits on rocky 'moonscapes.'" Bigger tires will smooth out the ride a bit, but having to pick your way through rocky downhills is the nature of the beast when riding a cyclocross bike on rocky trails. I should know: much of the singletrack around here is fairly rock strewn.
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Old 12-07-07, 12:15 AM   #3
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I ran a 1.9" front and a 44mm rear for awhile. It rode great.
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Old 12-07-07, 11:25 AM   #4
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A 44mm and 37mm will slacken the head angle about a quarter of a degree making the bike a bit more stable in the rough stuff at the expense of quicker handling on a road-ish situation. A 35/32 combination would only affect geometry by a tenth of a degree.

I've often run 2.1/1.9 combinations on the mountain bike before for better straight line high speed stability on dirt roads. I don't think I'd bother with such an arrangement on the cyclocross bike.
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Old 12-10-07, 04:12 PM   #5
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I ride 42mm 40mm Mthyos CX only because the 40mm is as fat as I can go in the back. I like these tires for riding dirt trails, they even work for certain cross courses.
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