If you go with 285/55's instead of 60's, you'll have a tire that is very close to the same diameter as the original and will only affect your speedo by about 2.5%, vs about 6% for the 60's. I've been running 285/55's for several months and have had no problems with the ABS, nor do I recall any of the many people running larger tires reporting such problems. Just my $.02