Z'mnypit

iTrader: (58)

I swapped my stock 17's on my 05 silverado CC for 22's and i was curious if any of you know about how much my speed will be off? The stock size is 245/70/17 so tire hieght would be 30.5in, the 22's are 305/40/22 so tire height would be 31.6in. I know its going to be off but I was going to see if I could get a guesstimate. Ill prolly just add the license to my HPtuners so I can fix it but in the mean time Id like a general idea.

Thanks!

badelf

http://www.miata.net/garage/tirecalc.html

just check it here

Z'mnypit

iTrader: (58)

Cool thanks! Only 2.1mph off. Got one last question. My brakes are awfull now, it stops fine but when you put on the brakes it will vibrate like crazy, it didnt do that with the stockers, well maybe a tiny bit but it wasnt noticeable. Im going to have the rotors turned and replace the pads the weekend. Just wanted to see if what is happening is normal or not when you swap to bigger wheels.

Thanks!

Big Tap

iTrader: (3)

I didn't notice anything when I put mine on my Tahoe. I think if you turn the rotors, it should probably take care of that problem.

Z'mnypit

iTrader: (58)

Ill know this afternoon. Im just going to swap the rotors with new ones and replace the pads...

Nick™

iTrader: (2)

sounds like the crappy stock rotors warped on ya

Z'mnypit

iTrader: (58)

Found the problem. It was the 4 small paper thin retainer clips that go over the wheel studs on the rear. I removed them, slapped the wheel back on and everything is fine. No more vibration. Who wouldve thought paper thin clips would have caused so much trouble.

cpelton

probably want to upgrade those rotors with 22's, ive warped mine twice in a year. I have to find some good aftermarket ones which will still fit the stock 17" wheels because I swap them back on for winter.