Aggressive Wheels and Stretched Tires....Welcome
09-12-2008, 02:08 AM
#843
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I was currious. I knew going smaller would affect my speedo but can it also hinder performance? I went from a 19" wheel with a 35 series tire to an 18" wheel with a 30 series tire.
09-12-2008, 05:47 AM
#846
Originally Posted by Barzten1
I was currious. I knew going smaller would affect my speedo but can it also hinder performance? I went from a 19" wheel with a 35 series tire to an 18" wheel with a 30 series tire.
Actually in theory performance should be increased going from a 19" to 18" due to the decrease in rotational mass. It really comes down to the two wheel and tire combinations you are comparing. In addition, your speedometer should not be affected at all going to an 18" wheel since that is probably what your car came fitted with off the lot. Even if your car came with 17"s the difference would be negligible.
09-12-2008, 06:16 AM
#847
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Originally Posted by Kwame@z1
J,
Actually in theory performance should be increased going from a 19" to 18" due to the decrease in rotational mass. It really comes down to the two wheel and tire combinations you are comparing. In addition, your speedometer should not be affected at all going to an 18" wheel since that is probably what your car came fitted with off the lot. Even if your car came with 17"s the difference would be negligible.
Actually in theory performance should be increased going from a 19" to 18" due to the decrease in rotational mass. It really comes down to the two wheel and tire combinations you are comparing. In addition, your speedometer should not be affected at all going to an 18" wheel since that is probably what your car came fitted with off the lot. Even if your car came with 17"s the difference would be negligible.
check out http://www.miata.net/garage/tirecalc.html and see how much your speedo is off. should only be a couple of miles off.
09-12-2008, 06:36 AM
#848
Originally Posted by Concave
his speedo is affected due to his tire size. your speedo doesnt care what size wheels you are wearing, it cares about what size tires you are using.
check out http://www.miata.net/garage/tirecalc.html and see how much your speedo is off. should only be a couple of miles off.
check out http://www.miata.net/garage/tirecalc.html and see how much your speedo is off. should only be a couple of miles off.
09-12-2008, 07:20 PM
#850
Your speedometer measures your revolutions using your overall outer diameter/circumference of your tire. Wheels can only effect it if they are bigger in diameter/circumference than the original tire size. You just need to get your tire's outside diameter/circumference within specs compared to the original tire size. If it is smaller than original, it will be off.
Last edited by DustinZ33; 09-12-2008 at 07:23 PM.
09-15-2008, 06:56 PM
#860
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Originally Posted by THe Emperor
What rims are these?