Nick on the tire

231 Views 7 Replies 5 Participants Last post by Pmack, 11 d ago

kaanivore

Discussion Starter · 11 d ago

So went to spoon on some Pirelli Diablo IVs, and damn is it a stiff tire! I was using a proper hydraulic machine and lubed it all up, but still it would not go on.

It wasn't my first time, but also not an expert so at some point the carcass was totally at its stretch limit and the little carrier thing that you hook the bead on quickly bound the tire up, leading to the nick below. There was not much more tear to the rubber beyond what you can see, but obviously the ply is showing through and it's kind of near the bead.

Any opinions on if / how safe this is to use, both on street and then on track? I'll be honest I got it on and went for a moderate (but careful) ride, with some temperature put into the tire and it held the exact same pressure but obviously a defect near the bead is "not ideal".

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sloth

· #2 · 11 d ago

I think that will eventually slow leak over time. You could probably pop that side off the bead, coat that spot in rubber cement, then re-bead and it should hold better. As long as there are no broken belt fibers I'd send it after sealing.

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Trey On Two

· #3 · 11 d ago

Odd, I've had that same issue on diablo III's

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Topaz

· #4 · 11 d ago

I did the same thing on the front tire when I mounted a set of S21 on a liter bike years ago. It was my first tire change. I had more damage. With the tire mounted I could see a little bulge on the side. I gave it a couple of easy rides and felt no vibrations or anything weird at all, so I let it be. Used the set for about 3-4k miles and it was all good.
I don't think the tire will explode on you. Eventually it may leak.

I'm sure you know this, but heat the tire before mounting it. Either letting it sit at the sun or the lady hair drier for 20 minutes.
Also, to finish it up, try to push the other end of the tire in the center depression of the rim so you get an extra space on the other side.

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kaanivore

Discussion Starter · #5 · 11 d ago

Trey On Two said:
Odd, I've had that same issue on diablo III's

Yeah had the same trouble on a Supercorsa as well, think it's that these sticky Pirelli's have super stiff side wall and belt construction to prevent it collapsing under heavy cornering loads?

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kaanivore

Discussion Starter · #6 · 11 d ago

sloth said:
I think that will eventually slow leak over time. You could probably pop that side off the bead, coat that spot in rubber cement, then re-bead and it should hold better. As long as there are no broken belt fibers I'd send it after sealing.

Good idea, didn't even think of rubber cement but have some in a patch kit somewhere.

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kaanivore

Discussion Starter · #7 · 11 d ago

Topaz said:
I did the same thing on the front tire when I mounted a set of S21 on a liter bike years ago. It was my first tire change. I had more damage. With the tire mounted I could see a little bulge on the side. I gave it a couple of easy rides and felt no vibrations or anything weird at all, so I let it be. Used the set for about 3-4k miles and it was all good.
I don't think the tire will explode on you. Eventually it may leak.

I'm sure you know this, but heat the tire before mounting it. Either letting it sit at the sun or the lady hair drier for 20 minutes.
Also, to finish it up, try to push the other end of the tire in the center depression of the rim so you get an extra space on the other side.

That's reassuring haha. I'll put some rubber cement on and let it be too.

Yeah I usually do it with the sun, but it was 9pm. After this happened I put a heat gun to it but it was taking ages. The bigger difference was to push the tire way down on the opposite side to that which had not yet got on the bead, and take it real slow while working the tire on. There's a point where the the remaining bead goes form being held really taught over the rim and looks like it'll never seat, but if you do it carefully and work it in while making sure the remainder doesn't pop off it'll get there.

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Pmack

· #8 · 11 d ago

kaanivore said:
That's reassuring haha. I'll put some rubber cement on and let it be too.

Yeah I usually do it with the sun, but it was 9pm. After this happened I put a heat gun to it but it was taking ages. The bigger difference was to push the tire way down on the opposite side to that which had not yet got on the bead, and take it real slow while working the tire on. There's a point where the the remaining bead goes form being held really taught over the rim and looks like it'll never seat, but if you do it carefully and work it in while making sure the remainder doesn't pop off it'll get there.

If you have a buddy with tire warmers, about 10 minutes on the warmers works great.

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