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Kant phuckin sphell
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Discussion Starter #1
What would you go with?

I am building a cross bike with a single up front for racing and training at night on fire roads.

I am using a Shimano 9 drivetrain.
Would you go with a 25 or a 27?
When riding road I love a 11-23 ( 10 speed).
I am a sport class MTB and a strong cat 4 on the road.
I live in NC and there are not any real mountians here. Lots of rolling hills.
It is hard for me to guess what I need just wondering what you guys think.

Thanks!
Tommy
 

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I'm somewhat strong and will be using a 42x27, which is just like 39x25, which is pretty common. I like having the 25 on one set of wheels and 27 on the other and make a swap on race day depending on the course.
 

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I ran a 42x25 all season. I'm changing to a 42x27 next season. Too hard to do any climbing in that gear on muddy hills.
 
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