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Re: Tire size and speedo reading???? (archive)
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Posted by craigwatanabe on February 18, 2002 at 00:29:04:

In Reply to: Tire size and speedo reading???? posted by PK on February 17, 2002 at 20:36:45:

Closest to TRX stock (200/60/390) would be a 205/60/15 on 7" E34 rims without undermining the car's suspension characteristics.

If you just go by 205/60 vs 200/60 the 205's would be a taller but because the TRX rims are actually 15.3 inches in diameter, The smaller diameter 15" E34 rims will compensate for the taller 205's.

215/60/15's would bring the overall height a bit taller than TRX stock diameters.

Don't go 195/65/15's as I have done. That combination is the cheapest closest approximation to stock TRX but the tire is too narrow and the car tends to lose traction in cornering as there is very little sidewall flex to keep the footprint flat on the ground. In other words the car breaks quickly and you can find yourself sliding into a turn and into a guardrail.

By going 215/60/15 you will be courting a speeding ticket as the larger diameter will give you a slower indicated speed than actual. In other words 55MPH on your speedo is more like 60-something.



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