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[burnmw]

So youve got 17s on 3 corners and a 14 on the other? in which case, thats your reason...one wheel is spinning faster than the others

Not necessarily, if the rolling circumference of both the 17's and 14 is the same then there will be no difference. Having said that there is likely to be a small difference but I'd doubt it'd be enough to upset the ABS? More likely to have knocked the sensor when swapping the tyre?