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> tires\speedo
driver66
post Jun 4 2003, 04:47 AM
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do you guys know how much 195 60 15 will throw off my speedo ? I just installed them on the front and would like to go all theway around with them ,but want my speedo to remain close as i can. any ideas? and remember i have the old original steel [ vw lookin ] rims
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dbelleperc
post Jun 4 2003, 05:53 AM
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I have 205/50-15's and at 100 MPH my speedo is only 4 MPH fast so I think it wouldn't throw it off that much at all.
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jdogg
post Jun 4 2003, 05:54 AM
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Go to this link and calculate it!

http://www.miata.net/garage/tirecalc.html
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driver66
post Jun 4 2003, 11:16 AM
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THANKS AGAIN....
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Porsche Rescue
post Jun 4 2003, 04:34 PM
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jdogg, that Miata calculator is a great tool. I think it would be appreciated if you posted the link as a new thread. I have book marked it for future use. I calculate the % difference in revs/mile between stock size and new size and figure that speedo will be fast/slow by that percentage. Is that correct?
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seanery
post Jun 4 2003, 04:39 PM
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ok, so what aspect ratio do you put in for 165SR15 tires?
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Porsche Rescue
post Jun 4 2003, 04:42 PM
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I believe 80 is very close.
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seanery
post Jun 4 2003, 04:45 PM
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danke
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