On 12/28/2017 TdLpps wrote:
"Each tread block has ended up with low spots of about 1/8" on the trailing edge. When pushing the bike in the garage I could feel each tread block rolling off the low spot and steeping onto the next tread block's high spot."
Gentlemen
I know this thread is about running a rear motorcycle tire on the front in companion with a car tire in the rear, however there is a sub issue here with tire cupping.
Currently I'm running a General G-Max AS-03 on the back of my '08 FJR Advanced Edition platform. I've been running car tires on my FJRs since late December 2009 with excellent results. However, it does put additional loads on the front tire which reduces their life about 15% in my case. Tire cupping is the reason for changing them earlier. I have run Michelin PR2, PR3, and PR4, and also Perrelli Angels, and the latest one an Avon Storm. The tire most affected was the Avon Storm, because of the cupping wear. This tire has a slender staggered sipe pattern down the center of the tire. Being a long slender sipe there are actually fewer scallops on the tire spaced out at longer intervals.This put the cupping at a rhythmic side to side pattern which noticeably affected the feedback in the handlebars. When running at lower speeds, below 35, it actually tugs at the front end and you can see it watching your hand grips. This constant negative feedback is annoying at the very least, and will add to fatigue when run at higher speeds. Most of the tires I've run were the Michelins, although they also had cupping their sipes are symmetrical about centerline, and did not induce any rhythmic alternating feedback, and also lasted the longest. With the Avon it was noticeable within the first 1000 miles, and only got worse with time and miles; I was glad to get that thing off when it finally wore out.
Keep this in mind when you mount replacement tires on the front end - double dark side or not.
Brodie