Which Wheels do I set my speedo to?
07-03-2009, 01:50 AM
#1
1st Gear Member
Thread Starter
Join Date: Jan 2007
Location: Arizona
Posts: 128
Which Wheels do I set my speedo to?
I am about to install a new set of wheels on my car, and they are slightly different sizes, do I set them to the size of the rear wheels, which makes the most sense to me, or the front wheels?
-James
-James
07-03-2009, 07:18 AM
#2
3rd Gear Member
Join Date: Oct 2008
Location: Toronto, Ontario, Canada
Posts: 743
Yep, it's your rears.....Compare the overall diameter change of your rear wheels ( Google.. "Miata Tire sizing") ...example 235/55/18 = 28.2 " diam. and 255/45 18 = 27.0 " diam. i.e. larger overall diameter will affect your speedo reading and rear Gear ratio...
Last edited by 07 GT E UPP; 07-03-2009 at 12:32 PM.
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