AMA Supersport Racer
Join Date: Dec 2008
Location: San Diego
Thanked 24 Times in 24 Posts
Feedback Score: 2 reviews
The older tires were in fact directional, but only in regard to the rain grooves. If you don't ever plan on riding in the rain, it's really not a concern.
The older JLB design alowed flipping because the forces on the tire don't have an affect on the belt.....kinda' hard to put into words.
Because of unfortunate liability concerns, and profit motives to increase tire sales, it's hard to get someone in the tire industry to give their bleesing on the flipping issue. I was surprised, and iimpressed, with Barry Wressell's comments.
It is obvious that when a used tire is flipped, there is a wear pattern......especially from acceleration forces. After I flip a tire, I ride several easier-than-normal laps to allow the wear profile to essentially reverse in the opposite direction. If you hammer on a flipped tire too soon, you will abruptly tear-off the leading edge of the wear pattern too soon. When this happens, the wear profile can be screwed-up for the remining life of the tire.
Trust me - I know what I'm talking about here. If you don't allow the wear pattern to "slowly" change direction, there will be a period of time when you are only riding on the very leading edge of the wear pattern before it was flipped (think about it)......it takes a while to burn-off that leading edge so the entire contact patch meets the track.