Hermie Posted May 18 Share Posted May 18 Looking for guidance on adjusting for different wheel combination. Rear. 275/40 R18 Circum = 2125.8mm Rev 756 per mile - 470 per km Front 245/40 R18 Circum = 2050.4mm Rev 785 per mile - 488 per km What settings do I need to change to keep ABS and speedo happy. Quote Link to comment Share on other sites More sharing options...
Hermie Posted May 20 Author Share Posted May 20 Help still need - 69 Mustang running BF XR 8 running gear, ABS and all wiring. Don't want to mess up the ABS now that it all seems to be communicating with out fault codes Quote Link to comment Share on other sites More sharing options...
Hermie Posted May 20 Author Share Posted May 20 Or maybe the better question is does anyone know what % difference before the ABS trips a code. Above combination gives me a 3.7% speed error factor front to rear. If I change the rears to a 275/35 error factor would be 0.4% Any advice would be great. Thanks Quote Link to comment Share on other sites More sharing options...
scotty Posted May 27 Share Posted May 27 Can't remember if it was 3% or 5% that would cause issues. Quote Link to comment Share on other sites More sharing options...
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