jimbo409 Posted June 5, 2006 Share Posted June 5, 2006 I am looking to upgrade my 16in wheels to 18in tire and wheels. How will this affect my speedometer. Thanks jim Quote Link to comment Share on other sites More sharing options...
1990LS400 Posted June 5, 2006 Share Posted June 5, 2006 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. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted June 5, 2006 Share Posted June 5, 2006 Agreed a calculator can make the change of no difference. As a speedometer changes as the tires wear from a smaller outside diameter. Quote Link to comment Share on other sites More sharing options...
Ronalder Posted September 27, 2006 Share Posted September 27, 2006 GOOD POINT Quote Link to comment Share on other sites More sharing options...
viparisto Posted April 23, 2007 Share Posted April 23, 2007 GOOD POINT Just stay stock if worried about the speedo. :cries: Quote Link to comment Share on other sites More sharing options...
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