Like most things, it depends... in this case it depends on if you like spinning or stomping. The SS standard of 2:1 for a 26 is fine for most folks - 32:16, etc. 'Course for a 29 you'd bump it a couple, say 32:18. Fast cats roll their 29er 32:16 on Sylvan, but that's too tall for me...

Rg.