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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 06-05-12, 06:28 PM   #1
KT043
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Difference between road bike and cyclocross sizing?

I was in my lbs and checking a semi-entry level road bike, the Trek 1.2. They fit me to a 58 frame and it seemed nice. While I was looking around, I saw a 2011 Lane on clearance for a similar price. I really liked the stealthy blacked out look and semi-trail capabilities. It also rode pretty smooth. The thing that confused me is that this was a 52 frame!?! How can I be on the end of the scale for one bike and then the other side for the other? Who is riding the 60 frame Lane with a stand over of 34 in?
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Old 06-05-12, 07:16 PM   #2
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Historically, CX bikes have had higher standover heights because of higher bottom bracket heights. I'm not sure how universal this is today. Actually, nothing is universal it seems, and bike geometries seem to vary all over the place. Lots of CX bikes do seem to size larger than stated, though.

I ride a 2010 Kona Jake in 54 cm, and a 2011 BMC Streetracer in 57 cm. They both fit me pretty well, though I'm considering a slightly longer stem for the Kona. The BMC has a slightly more relaxed geometry than a true racing bike, with a slightly taller headtube, which probably makes it a bit more comfortable than some. For me, at least. I was considering a Felt Z series until the BMC went on clearance last fall. Or maybe a Cannondale Synapse.

I'm not sure I helped much, but it really isn't uncommon to ride a size or two smaller CX bike than road bike. They're all different, though.
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Old 06-05-12, 08:25 PM   #3
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+ it is a measure, perhaps, of the tippy top of the seat collar/ lug,
and some use a different top point to call 'size' ..
Best to take out a measuring tape of your own,
so you measure to the same points.

sloping top tube really throws size data off.. get virtual top tube length too..
as if level..
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Old 06-11-12, 01:48 AM   #4
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When I tried a Caad10 I was sized at a 58 but on the crux that I ended up buying I was sized at a 56. Now since its not the same brand it could be that or it could be due to the type of bike and geometry.
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Old 06-11-12, 08:29 AM   #5
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Quote:
Originally Posted by KT043 View Post
I was in my lbs and checking a semi-entry level road bike, the Trek 1.2. They fit me to a 58 frame and it seemed nice. While I was looking around, I saw a 2011 Lane on clearance for a similar price. I really liked the stealthy blacked out look and semi-trail capabilities. It also rode pretty smooth. The thing that confused me is that this was a 52 frame!?! How can I be on the end of the scale for one bike and then the other side for the other? Who is riding the 60 frame Lane with a stand over of 34 in?
Typically, a cross bike will fit with about 1 to 2cm shorter in reach and 1 to 2 cm shorter on the seat tube with all things being equal. Incidentally, I ride a 52cm Trek carbon while I ride a 51cm Masi Speciale CX. There must be some mistake in the tagging on the bike sizes. A 52cm Trek Lane is similar to a 52cm Trek 1.2 in terms of fitting if you examine the length of the top tube. It's quite normal for bikes being tagged incorrectly! In fact, my Masi Speciale CX was tagged on the invoice as being a 58cm and in fact it has a label stuck with 58cm when in fact, measuring the top tube yielded the size that is a 51cm. After fitting professionally, the fitter agreed the size tag was wrong from the factory!
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