3pt1lumina Posted March 5, 2006 Report Share Posted March 5, 2006 If I go from 215/60/R16's to 225/60/R16's on my 90 Lumina, how far off will the speedo be thrown off? Just wondering about this. When I went from the stock 195/75R14's to the 215's and my speedo was exact. Now after putting the new UB3 cluster in, the speedo is 5 fast? dunno why. Anyways, if I go 225's will that speed up the speedo or slow it down? Thanks for the advice all. Quote Link to comment Share on other sites More sharing options...
THe_DeTAiL3R Posted March 5, 2006 Report Share Posted March 5, 2006 The tires will be spinning LESS, so it should slow down the speedo... Maybe get someone in a different car to drive beside you up to like 60 or something and see how fast you are actually going.. Quote Link to comment Share on other sites More sharing options...
19902drlumina Posted March 5, 2006 Report Share Posted March 5, 2006 well i did a calculator for ya when the speedo says 65 youll be going 66.17 mph http://www.net-comber.com/tirecalc.html Quote Link to comment Share on other sites More sharing options...
3pt1lumina Posted March 5, 2006 Author Report Share Posted March 5, 2006 excellent so that's not that big of a deal then! woo hoo awesome. Thanks guys. Quote Link to comment Share on other sites More sharing options...
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