split rim changing, mobile. Rick's Tire Service Inc. 181 S Watson Rd Ste 309, Arlington, TX 76010 (817) 640-6252 M35 data: 2650 rpm 6.71 rear 0.81 4th gear Look up the Revs per mile below or at dealer location. http://www.michelin.com/us/eng/tire/truck/tires/xza/xza2_sp.html http://www.goodyear.com/ Goodyear http://www.toyo.com/ Toyo http://www.trucktires.com/ Firestone/Bridgestone Revs per mile will vary with different Tire manufactures size for 'regular tubeless' rim = revs/mile = size for 'split rim' 10R22.5 = 520 = 9.00x20 10.1538' circ. 38.7848." dia 56MPH @ 2650 rpm 11R22.5 = 504 = 10.00x20 10.476' circ. 40.016" dia. 58mph @ 2650 12R22.5 = 492 = 11.00x20 10.73' circ. 40.99" dia 59.4 mph @ 2650 11R24.5 = 480 = 10.00x22 42.0169" dia. 61 mph@2650