Very "Kevin Cameron" like analysis! I usually refer to this as "ramping", instead of cupping but it's all the same. I don't believe that the frequency of the ABS pump would play a factor unless it is actually engaged. The ABS pump does absolutely nothing until the ECU determines a condition of imminent lockup, at which time it will spin up (< 100ms) and be ready for servo actuation. Nice analysis though. To hear the ABS pump spin up, set the kill switch to "kill", turn on the ignition and hit the starter button. The starter will not spin, but a couple of lights on the dash will blink and in about 1 sec. the ABS pump will spin up momentarily.
The GTS is simply hard on tires! It seems that the tires that do best on the GTS are those that have fewer horizontal or cross tread blocks near the centerline of the tire (since that is where most of the braking occurs). For example, the Bridgestone 020 looks like this: http://www.tiresunlimited.com/images/bridgestone/BT020F.jpg Too many tread blocks near the centerline. Whereas the Pirelli MTR23/24 GTS(concidence? I think not!) looks like this: http://www.tiresunlimited.com/images/pirelli_motorcycle/dragongts.jpg Fewer tread blocks and farther away from the centerline. We've also had good reports on the newer Macadam 100s. They look like this: http://www.tiresunlimited.com/images/michelin_100x_tires.gif Looks like a tire that will cup badly to me, EXCEPT the size of the tread blocks is much larger than the previous Macadam 90s. Let's look at one other tire...the Metzeler Z4: http://www.tiresunlimited.com/images/metzeler_motorcycle/mez4.jpg Nevermind, that's just too ugly to put on a GTS! :^) Actually, there are lots of blocks on the centerline, but they tend to be more diagonal. Kevin Hawkins // Greensboro, NC [EMAIL PROTECTED] http://www.kevinhawk.com Y2K Kawasaki ZRX1100 //'93 Yamaha GTS1000 +++++++++++++++++++++++++++++++++++++++++++++++++++ Jerry Wills wrote: Why do front tires cup? So we are all talking about the same thing, cupping is a hi lo wear pattern. Right? Road conditions can also create a problem, and the ABS could be at fault also. What is the frequency of the cups, does it match the ABS frequency? Jerry Wills
