I have a set of panaracer fire xc pro and a as in 1 kenda smb 8. I was thinking the tire with the least rolling resistance goes up front so you have the more aggressive tire in the back for traction because im light and have traction issues. However, on the bikes here that use different tires, I commonly see the tire of least resistance in the back and the more aggressive one up front. So can someone shed some light on this? Thanks!