how will this affect my speedometer

Forum for Nissan wheel fitment, tire selection, suspension setup and brake discussions.
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NeverEnuff
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Joined: Mon Sep 01, 2003 8:39 pm
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i dont realy want to buy new rims yet but r15-205-60 dont have vary many good tires to choos frum so want to go to r15-205-55 just want to know how off my speedo will be

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Exar-Kun
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not much, maybe 3%. that size is actually listed in michelins MAST guide for optional tire sizes for the s13.-chet
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Grant@tirerack
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The basic formula is this:

Take the O.E. tire's RPM and multiply by 55 (indicated speed MPH). Take that result and divide by the new tire's RPM to get your actual speed when the speedo reads 55.
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NeverEnuff
Posts: 136
Joined: Mon Sep 01, 2003 8:39 pm
Car: Cars and Girls

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cool thanks for help guys
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