I've run mine at 35 and 45, didn't really notice a difference but thats just me. I know you're supposed to run higher pressure in a higher load range tire so I've been running them at 45. I was told by the shop that I should be ok running them at 35, so I did for the first 6 months and then upped it just because, didn't really notice anything odd either way, and I'll second Westracing, you will feel the road alot more.