Question for those of you with 255 75 17 size tires

alia176 · 2015-05-19T13:24:35+00:00

Lots of tires/wheel threads are on this board but trying to find out some specific info have lead to lots of reading with not much satisfaction. Hence I'm asking some pointed questions below! Hopefully this will help out others in the same boat. Tire calculations came from this site: Calculator My stock tire size is 265 65 17 (30.5" x 10.5"). I'm trying to decide between a set of 255 70 17 (31" x 10") 1.6% increase in diam. 70 mph will be actually be 71 mph OR 255 75 17 (32" x 10") 4.9% increase in Diam. 70 mph will be actually 73mph If you went with 255 75 17, - P or LT? - did you do anything for speedo correction? If so, what did you use? - is the transmission still able to shift in/out of the torque curve properly? - other than slower starting from a stop, any other adverse affects? - any noticeable fuel economy hit with V8 or V6? Theoretically, econ should be better on long hwy trips. - did you have to have a lift of (springs/spacers/or) some kind to prevent rubbing? I'm running FJC suspension so 1" or less of lift is what I got currently. I'd like to take advantage of Memorial day sales at Discount Tires, hence the questions! Thanks!