With the 3.25's, 29" tall tire and the Turbo350 1:1 final drive you will be turning 2636rpm at 70mph. Running 3.00's only drops you to 2433rpm. Switch to the 700R4 with it's 0.696:1 final drive and you get 1835rpm at 70mph with 3.25's, or 1693rpm (too low) with 3.00's.