Poor-sha

I decided to take my front track wheels to the local tire place to have them flip the tires since the outside edges were wearing a bit more than the inside. The guy went to break the bead and on the inside where the tread meets the sidewall split.





Does anyone know what would have caused this? I'm sure glad it didn't happen on track but I'd like to understand what caused this as throwing out an entire set of R6 that are otherwise in good shape isn't something I want to do on a regular basis.

I'm running -2.8 front camber and 26-28 starting pressures. The tires had about 37 sessions on them.

Falcon

Did you not see that split when you had the tires off when transporting them to the tire place?

Poor-sha

no. it appears to have happened when they broke the bead.

brkntrxn

37 sessions on a set of R6s is a lot, no matter how much rubber was left on them. Maybe they were just used up and breaking the bead was the final draw?

Falcon

The reason I asked whether you saw it or not, is it appears as though that was done by the tire machine. Whether it was the fault of the tire or something wrong with the machine when it broke the tire down, it happened at the tire shop.

Did it happen to any of the other tires?

Poor-sha

I ended up bringing my spare set of Hoosiers up and they removed the other 3 and mounted the 4 new ones without any problems.

I have to admit that my first reaction was "WTF did this guy do" but looking at the machine, where it failed, and knowing that this is the guy that does all of their low profile tires I don't see how it could have been his fault.

I have a hard time believing that a tire that was just "used up" would come apart like that but that's why I'm asking.

drivinhard

those bead breaker paddles, it's easy to let the paddle slip up (away from the wheel lip) closer to tread surface, and put more pressure closer to the edge there where it split. and your split area is about the size of a bead breaker paddle.

they generate several thousand PSI pressure

Falcon

That's what I was thinking, too, Mark! That looks like a machine tear more than a tire failure.

Poor-sha

Well that sucks. I guess I've found yet another tire shop I'll never go back to. Too bad the equipment is so expensive or I would just do it myself.

fatbillybob

I got my own machine used $1000 bucks. Best money I ever spent. Like buying your first welder you think how this thing will ever pay for itself. But after several years of ownership there is no way I would do this sport without one. IMO you do not even need a balancer. What I do is balance the wheel with tire stem in place. Then just mount the tire. This is the 21st century manufactureing is very precise. Often times I see a wheel/tire with lots of weight on it and the problem is not balance but compensation for an out of round wheel. 0.40 thousands out of round makes a huge vibration that 99% of the time people accuse the tire of being out of balance. That is another thing you can check for at home if you own your own machine. Oh yeah by the way that loks like the machine helpped damage that tire for the above reasons mentioned. You gotta get the shoe at the rim not too high by the tread.

drivinhard

I bought a used Corghi tire machine last month for $800

I spent ~$450 last year mounting/unmounting/balancing race tires at a local shop

Poor-sha

OK, so to derail my own thread - where are you guys finding these great deals on changers? When I look at what I just threw away in Hoosiers it doesn't take much to justify the machine cost at those prices.

Sidney004

That is a great deal, Corghi's are the "Ferrari" of tire changers. I change mine using a manual tire changer and I agree completely that the tool was too far away from the wheel lip and caused the delamination trying to break the bead.

froggy47

Bubba did it with his machine, a good shop would have admitted that & got you a new tire.

RichieRichZ06

37 sessions on a set of R6's?

dvandentop

damn sucky to hear sean, did you keep the others or toss em all?

Poor-sha

I have the other 3 still but what am I going to do - run one new front and the others with 37 sessions? Luckily I bought a lightly used set from Nigel earliler in the year so they're mounted now.

RX7 KLR

What could go wrong when that large piece of metal with a lot of force behind it is used improperly? Consider yourself lucky, I have seen many wheels bent by guys not paying attention.

I bought my Corghi used five years ago for $650, it is a great tool to have. The way I see it I can get by with one less set of wheels now, I can change from old scrubs to new stuff and back any time I want.