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so if i add 17s to my civic how does it affect my speedometer......and is there anyway to fix it.....or what.......

 
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At the top of the page there is a tire calculator that will tell you how different size wheels will effect your speedo.tire calculator

 
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If you add 17" rims, you should decrease your tire sidewall accordingly, so that OVERALL wheel diameter stays the same approximately. Use a tire calc to see how much you're off. Try not to go more than +/- 2.5%.

 
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17" wheels with a 205/40/17 tire will not affect your speedometer to a degree that you'll notice. You won't need to do anything unless your overall tire & wheel diameter is bigger around than your factory diameter.

 
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<< At the top of the page there is a tire calculator that will tell you how different size wheels will effect your speedo.tire calculator >>



I may add, if your new wheel is smaller than your stock wheel, you are going slower than what the speedo said. and vice versa

 
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Click here and follow the directions. This will tell you exactly how much your speedo will be off.

 
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One more thing, if you're really worried about it or just plain ****, you ca always take it somewhere to get the spedo calibrated. I think it might be a little expensive though and like was said before, it doesnt throw it off that much anyway so I'm not that worried about it.

 
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I have 215/40/17, although I have never installed it yet cause of this stupid winter season. Hopefully it doesn't slow me down. that's all I'm worried about[IMG]i/expressions/face-icon-small-mad.gif[/IMG]

 
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I run 205/55r16's theyre larger than stock but not too hard to correct in your head [IMG]i/expressions/face-icon-small-smile.gif[/IMG]

 
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205/40/18??? How 'bout that? 0.04% too fast . . . sound good? I live in a rural area with pretty decent streets, yet we do get our share of craters in the road