| SubieNate |
03-07-2013 08:35 PM |
Quote:
Originally Posted by tisb0b
(Post 779036)
Your math is off, stock is 215/45/17 to move to an 18" rim typically you'd run 225/40/18 to maintain speedometer accuracy. 10mm extra width is not going to result in 20mm taller than stock. Going with 225/45/18 could work at the expense of speedometer accuracy.
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His math is slightly off but it's almost there. A 235/40-18 has a diameter of 25.4 inches and the stock 215/45-17's have a diameter of 24.6 inches. That's a total diameter difference of ~20mm. But, only half of that contributes to ride height, so it would bring it back up 10mm for a 10mm total drop.
Either way, the speedo is jacked and the car is going to be more sluggish as the gearing has been altered.
Changing tire size to compensate for ride height is not the greatest idea. Either deal with a lower ride height or deal with the gap, or find some compromise between the two (mild drop) that makes things livable. Screwing up the gearing and speedo isn't really a good option.
Nathan
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