Wheel fitment question

[ard]

Eyeballing them by 'rolling up next to each other' is WHOLLY inadequate....



*YOU* dont measure them. YOU go to tire rack and - for each specific tire/brand/model- you look up the "specs".





Keep in mind that an "OD" isnt loaded (ie weight of the car on the tire) whereas the 'revs per mile' includes deflection when the tire is loaded.



Mismatch in the revs/mile is precisely what the differential 'sees'.. too much, it is damaged.

[sleepybear]

Originally Posted by ard

Eyeballing them by 'rolling up next to each other' is WHOLLY inadequate....



*YOU* dont measure them. YOU go to tire rack and - for each specific tire/brand/model- you look up the "specs".





Keep in mind that an "OD" isnt loaded (ie weight of the car on the tire) whereas the 'revs per mile' includes deflection when the tire is loaded.



Mismatch in the revs/mile is precisely what the differential 'sees'.. too much, it is damaged.

So I went on to Tire Rack, looked up the revs/mile on the current 18's tires and the tires mounted on the 20's, and found it's 713 on current 18's, and 726 on the 20's. So if I understand correct, that's a 1.8% difference (13/713). Is that much of a mismatch going to be a problem?

[ard]

Originally Posted by sleepybear

So I went on to Tire Rack, looked up the revs/mile on the current 18's tires and the tires mounted on the 20's, and found it's 713 on current 18's, and 726 on the 20's. So if I understand correct, that's a 1.8% difference (13/713). Is that much of a mismatch going to be a problem?

It isnt the mismatch between "the old tires' and 'the new tires' that matters....


its the mismatch between front and rear







Clear?