N2Ojunky

I have a pair of 28×10.5 R15S M5 MT slicks. The S is for stiff side wall to improve 60' times and the M5 is the compound. I also have a pair of 26×10.5 M5 MT ET street "not the radial" which is kind of like a slick . My question is will there be a noticeable difference in my E.T., 60' and so on between the two. I have yet to run either on my car and I'm trying to figure which one to use this weekend in a race vs a guy. I mean who wants to lose money so every edge counts. It will be 1/8 mile on a non prepped track with arm drop. I would also like to know so when I go to my home track and run it "it is 1/4 mile". Thanks.

LT4vert

iTrader: (3)

Would depend on how much power the car is making, suspension set up ect. Theres alot of variables there. If you have both tires already, why not do some testing, if the 26" et street works theres no reason to run the bigger tire. Im not sure about the 28x10.5 size, but on my Trans Am I ran a 28x12.5 and the rear bumper needed to be cut a little and some clearencing in other areas as well as adjusting lca's and p rod, as well as rolling the fenders.

N2Ojunky

OK, the 28×10.5 fits fine and it should make a difference in 60' & E.T because of the shorter/taller roller out. I'm thinking the 26's should be a little quicker but I'm not sure. That is what I'm mainly wondering.