Wazz72 Posted February 2, 2005 Share Posted February 2, 2005 Changed my 16" toyota wheels for 18" 5 spoke alloys, and my speedo is ODO is now kerplunk. Did a trip the other day that was 54 miles and my odo said I had done 35. Should it be this far out? Does it need to be recalibrated on a rolling road? Also put an APEXi BOV in, what should the spring setting for the boost be? Link to comment Share on other sites More sharing options...
JamesG Posted February 2, 2005 Share Posted February 2, 2005 That shouldn't happen. The circumference of whatever tyres you put on should be roughly the same. What profile and width are your 18" wheels? Link to comment Share on other sites More sharing options...
stt Posted February 2, 2005 Share Posted February 2, 2005 This aught to help you,There was a diagram on there but i cant see it but then im on my mates puter! http://www.miata.net/garage/tirecalc.html Link to comment Share on other sites More sharing options...
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