what does that tire size equal too in metric measurement
i need the size for speedo calibration

thanks

I don't have TunerCat or LT1_Edit in front of me, but I think you can use the circumference in the program in stead of the tire designation. Find the spec on MT's site. Or, look up the circumference and work backward (find the conventional tire size with that circumference). Sorry if that sounds confusing, but I know exactly what I mean!

Rich

According to the MT web site, that tire mounted on a 10" rim has a sidewall width of 12". A tread width of 9.8". Overall diameter (tire height) is 26.3" and the circumference is 82".

Cross referencing to the MT ET Street radial, the P275/50R15 is listed as having the same size equivalent as 26x11.5x15. The street radial mounted on a 10" rim is listed as a sidewall width of 11.3". Tread width of 10". Overall diameter of 26" and a circumference of 82".

Not sure why both have the same circumference when the ET street is .3" taller. I'd figure the radial would be taller because of the radial belts in the sidewall making the sidewall stiffer

275/50R15 through tire calculations actually comes to 25.8" tall. 285/50R15 would be closer at 26.2" tall.

thanks guys lol at Rich
i'll probably just go with 285/50/15, that should put my speedo just over actual mph, which will help keep me from getting tickets
275/50/15 was about 3-4mph over on my speedometer compared too the actual reading on te laptop

thanks fellas

EDIT; i wonder if an 8" rim (what i use) makes much of a difference in the overall circumference

A little. The narrower rim should pull the sidewall width in slightly. This will probably cause the height to increase a bit. Take the tire off or jack it up to take the load off and measure the circumference.

MT quoted it at 82". The diameter of a 82" circumference circle is 26.1". Basic math.

10-4
i was never good at math, history and social sciences were my best subjects

thanks again