wheel / tire size speedo differance

[350zya]

I am going with a 20 inch wheel with a 35 sidewall. How will this change my speedo readings (slower reading? faster reading?) Can my speedo be changed to make up for the big wheels and tires?? thanks!

[BILL T]

If the outside circumference remains the same; say bigger rim but smaller sidewall the speedo won't change. Usually the speedo is run by a gear from the transmission and these can be changed.
Since the Z is rear wheel drive it won't matter what you do to the front tires, only the rear. I doubt the combo you describe would
change the speedo much, if any as long as the side wall is smaller.

[Conceyted]

http://www.1010tires.com - go to their tire calc and compare them to the stock tires... it will tell you the speed difference.

DO NOT, however, buy tires from there. They are expensive and http://DiscountTireDirect.com gives cheap prices and free shipping.

[350zya]

thank you for the help!!