How narrow can I go / Suitable for tracks
Hi Im new to cycling so would really appreciated some help. I recently got a specialized crosstrail which came with quite grunty - Specialized Borough XC Sport, 60 TPI, wire bead, 700x45c. I intend to do a the Greenway to Paris from London - some unsurfanced tracks but want a slightly more rolling tyre - would this be good?
Do i have to stick to 45 as this is whats on, i would rather go narrow but cant afford new wheels - would these fit and how narrow can i go on the same wheel.
Any help really appreciated - cheers