I just replaced my stock 39/14 with a 39/13 for more bottom end. The Smaller the number the better lower end you will get. The higher the number the more top end you will get.
For where i ride in upstate,ny the bottom end is what i needed. I rarely ever hit 5th gear because i just dont have the trail space. Hope this helps.
4 years, 6 months ago

by
Racerdan
Albany,NY