1998 Wheel Size

[jimbo409]

I am looking to upgrade my 16in wheels to 18in tire and wheels. How will this affect my speedometer. Thanks jim

[1990LS400]

Your speedometer accuracy will depend on the section width and profile of the tires you choose for your 18" wheels.

For example, it looks like your speedometer will read 6.143% too fast with 225/40R18 tires but just .23% too slow with 245/45-18 tires.

Play with the numbers on http://www.1010tires.com/TireSizeCalculator.asp while checking the available sizes and prices on http://www.tirerack.com/

There are likely a number of other combinations that will keep the speedo error low. You might want to ask others how they like a particular wheel size / tire size combination on their 98-00 LS since there can be a noticeable effect on ride quality and a reduction of tread life.

[SKperformance]

Agreed a calculator can make the change of no difference.

As a speedometer changes as the tires wear from a smaller outside diameter.

[Ronalder]

GOOD POINT

[viparisto]

GOOD POINT

Just stay stock if worried about the speedo. :cries: