Harryburgundy":1xi2bkdy said:
Why the silly cantis when V's would be better...or disc?
If I ride 17" Mountain bike with 22" top..what would a good size cyclocross be?
Should be much faster on-road, yes?
Carl
personally I love cx bikes. (a few of me and the mrs's pictured).
I think there are two ways of looking at them.
a) not that good off road and slower than a road bike on road, so what's the point?
b) good enough off road for a bimble, way quicker on road than an MTB.
I like - b.
I like that it's a great all rounder. I use it much more than the mtb now. Don't get me wrong, nothing compares with those days I take the mtb out and remember why they are so much fun on proper off road days. But I just like that I can go out form the door, 10miles to the hills easy enough, then head off road and through the woods, have some fun, see some off roadness and nature and then spin home fast and efficient afterwards.
Plus, it does have a sense of smugness coming out of the woods next to the 120mm gang on effectively a racer.

Or worse, overtaking one down the South Downs Way like I did on Sunday.
As for cantis, i'm about to put V's on as I'm fed up with them nopt stopping me.
I'm 5ft 8in and use a 52/54. I believe you drop a size or so from your road size. But I don't have a road bike, so I couldn't tell you if that's the case. Makes sense though to me.
I love 'em. And they make for great winter riders too. because they make you go off road enough, but don't tend to make you clug along thinking mtb'ing is over for another 6 months.
AND...
They improve your off road riding skills. Because you have to know what you are doing to ride rooty singletrack on 30mm tyres at 80psi on drops with rubbish brakes.
GET ONE.