ABS F/R Tire diameter Question
02-02-2005, 09:55 PM
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ABS F/R Tire diameter Question
I am running slightly different front and rear tire diameters on my 964 US Carrera Cup. My fronts are 24.4 inches and 76.7 inches in circumference. The rears are 25.2 inches diam. and 79.1 inches in circumference. The circumference difference is 3.1%. Is that a problem for the ABS ?
02-03-2005, 03:07 AM
#2
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3.1% is within the 6% deviation allowable.
The ABS will only fire up a fault if there is a 6% deviation between front and rear. If there is a greater than 6% deviation from original on all four wheels the ABS cannot detect it.
The speedo will be inaccurate and the ABS activation points will be incorrect leading you to believe you have an ABS problem, which you sort of have.
Ciao,
Adrian.
PS: My concern with this deviation is with your speedo accuracy.
The ABS will only fire up a fault if there is a 6% deviation between front and rear. If there is a greater than 6% deviation from original on all four wheels the ABS cannot detect it.
The speedo will be inaccurate and the ABS activation points will be incorrect leading you to believe you have an ABS problem, which you sort of have.
Ciao,
Adrian.
PS: My concern with this deviation is with your speedo accuracy.
Last edited by Adrian; 02-03-2005 at 09:37 AM.