Speedometer going to read incorrect with bigger wheels?
Thread Starter
Teching In
Joined: Aug 2005
Posts: 42
Likes: 0
From: Washington D.C.
Speedometer going to read incorrect with bigger wheels? im gonna put 18 inch wheels with 275/35ZR18 tires on my car (96 Z28 with stock salad shooters). Does my speedometer read wrong when I have them put on. I have a HPP III lying around if it is going to read wrong I can change it with the HPP II right? just a quick question.
TECH Apprentice
Joined: Jul 2005
Posts: 310
Likes: 0
From: Maryland
If the overall wheel/tire diameter changes significantly, you will actually be traveling at a different speed than the speedometer reads. If you do a search or go to Discount Tire's website, there are some calculators that can give you an idea.
TECH Enthusiast
Joined: Feb 2004
Posts: 546
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From: Central Iowa
The overall rolling diameter of P235/55R16, P245/50R16, P275/40R17 and P275/35R18 are all the same so you shouldn't have any problem at all. You speedometer and odometer should all be fine. 
You can search for a wheel and tire calculator and it will tell you the differences but they're pretty small and not much to worry about with the size you're going. The size your going to is almost identical to stock. If you get tuning in the future I would go ahead and recalibrate anyway though.
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Wheel size has absolutely no affect on the speedo . . . its the overall diamater of the tire.
So in the stickys are some tire calculators, to help in your tire choice, but as JD said all those tires are the same OD, so there should be no change
So in the stickys are some tire calculators, to help in your tire choice, but as JD said all those tires are the same OD, so there should be no change
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