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Is this tire ruined from my trainer?

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Is this tire ruined from my trainer?

Old 05-23-19, 10:01 AM
  #1  
rgr555
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Is this tire ruined from my trainer?

Not sure why my trainer did this to my tire today. Tire was pretty new and haven't used trainer in 6 months. Tire pressure was 95

The bike was properly mounted and the rear wheel was set with the proper 2 clicks.

Do I have to replace this tire or is it safe to ride on the street?


Last edited by rgr555; 05-23-19 at 10:07 AM.
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Old 05-23-19, 10:16 AM
  #2  
colnago62
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You need to buy a trainer tire. I have trainer tires on some old wheels. Tainers tend to eat up non trainer tires.
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Old 05-23-19, 10:17 AM
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When did you notice this? Possibly the roller overheated and melted the tire when you stopped on 1 spot. Not uncommon with trainers with small mass rollers that dissipate heat poorly. Tire is probably okay to ride on the real although you might have a lump when rolling.
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Old 05-23-19, 10:20 AM
  #4  
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That's weird, but I wouldn't necessarily say that it's ruined; if you look at the wear indicator dot towards the lower right corner, that patch doesn't look any deeper. I would probably take it out for a ride and see if the patch is noticeable/bothersome.
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Old 05-23-19, 10:28 AM
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Originally Posted by redlude97 View Post
When did you notice this? Possibly the roller overheated and melted the tire when you stopped on 1 spot. Not uncommon with trainers with small mass rollers that dissipate heat poorly.
it's also possible that the brakes were applied while the roller was overheated.
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Old 05-23-19, 10:29 AM
  #6  
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Originally Posted by colnago62 View Post
You need to buy a trainer tire. I have trainer tires on some old wheels. Tainers tend to eat up non trainer tires.
He has a trainer tire now. That one.

Now he needs to buy a new tire for outside.
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Old 05-23-19, 10:31 AM
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redlude97
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Originally Posted by noodle soup View Post
it's also possible that the brakes were applied while the roller was overheated.
Yea or a tire slip when sprinting etc.
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Old 05-23-19, 11:00 AM
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Should buff right off....
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Old 05-23-19, 12:04 PM
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I wouldn't ride a tire with that kind of damage.
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Old 05-23-19, 12:22 PM
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redlude97
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Originally Posted by TimothyH View Post
I wouldn't ride a tire with that kind of damage.
On the rear? Its not even as deep as the wear indicators on tread. I've ridden GP4000s until the casing is showing which this tire isn't.
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Old 05-23-19, 12:27 PM
  #11  
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I don't mess with things that could cause horrible injury. I'd buy a new tire immediately.
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Old 05-23-19, 12:55 PM
  #12  
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I wouldn't generally use a tire on a trainer and then ride it on the road. Apart from he seeming damage to your tire, with time, the trainer wears a severe flattening into most tires. Some people buy trainer-specific tires. I just use old tires that are no longer road-worthy.

To make it easier to swap back and forth between the trainer and outdoors, I use an old rear wheel for the trainer, so all I have to do is swap wheels. The only real expense was buying an extra cassette for that wheel.
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Old 05-23-19, 02:42 PM
  #13  
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I have lost count of the number of GP4000's I have seen have heat issues on the trainers here in the training center. It's a really crappy trainer tire.
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Old 05-23-19, 04:33 PM
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Originally Posted by redlude97 View Post
On the rear? Its not even as deep as the wear indicators on tread. I've ridden GP4000s until the casing is showing which this tire isn't.
I wouldn't either. It'll probably roll lumpy, and it's probably safe but might not be. And for context, I'm lucky to have my job, and the $ for one tire is worth the ride quality and peace of mind to me. I can understand how other people can weigh things differently though.
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Old 05-23-19, 04:37 PM
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Originally Posted by Seattle Forrest View Post
I wouldn't either. It'll probably roll lumpy, and it's probably safe but might not be. And for context, I'm lucky to have my job, and the $ for one tire is worth the ride quality and peace of mind to me. I can understand how other people can weigh things differently though.
I don't have the $ but can get tires at wholesale and OEM pricing... but still I would simply replace it and be done with it.

i understand everyone's situation is different but for me life is too short to ride on crappy tires.
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Old 05-23-19, 11:32 PM
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Originally Posted by Seattle Forrest View Post
I wouldn't either. It'll probably roll lumpy, and it's probably safe but might not be. And for context, I'm lucky to have my job, and the $ for one tire is worth the ride quality and peace of mind to me. I can understand how other people can weigh things differently though.
+1

That tire costs about $40. If it causes a crash, how much time away from work might that be?
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Old 05-24-19, 10:45 PM
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I use Conti Ultra Sport II on my road bikes, including on the Cycleops trainer. No problems, even with intervals and sprints that cause a little dragging on the rollers if I don't build up speed gradually enough. Good, tough, grippy enough for my purposes, reasonably low rolling resistance and cheap. Different rubber compound than the GP4ks tho', so maybe that's a factor.
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Old 05-25-19, 07:08 AM
  #18  
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Its not the rubber holding the tire together, its the casing. - > Imo, the tire is fine unless the "injury" is all the way through the rubber thread. It may be a bit bumpy tho. Im betting it happened because you used the brake.
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Old 05-25-19, 09:27 AM
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How are these things made?

I think it was @Doge who said to never use a tire with glued tread on a trainer and used Corsa as an example.

Are the treads glued to the casing on higher end tires?


-Tim-
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Old 05-25-19, 09:44 AM
  #20  
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Originally Posted by rgr555 View Post
Not sure why my trainer did this to my tire today. Tire was pretty new and haven't used trainer in 6 months. Tire pressure was 95

The bike was properly mounted and the rear wheel was set with the proper 2 clicks.

Do I have to replace this tire or is it safe to ride on the street?
I'm curious what type of trainer you are using and the diameter of the roller contacting the tire. I've always used GP4000s on a KK trainer and have never observed any tire damage. The reports of tire-eating trainers I've seen usually indicate a small diameter tire roller.
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Old 05-25-19, 11:52 AM
  #21  
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Originally Posted by TimothyH View Post
How are these things made?

I think it was @Doge who said to never use a tire with glued tread on a trainer and used Corsa as an example.

Are the treads glued to the casing on higher end tires?


-Tim-
Tires treas and real cheap tires are molded with the tire. The put the casing in then mold the rubber around. These are not as supple (higher CRR) but hold together well. Tufo does their own weird thing and I think the tread is molded on. As Tufos will run near 200PSI - they are like riding on cardboard. Some have a similar two stage process where the tread is heat vulcanized onto the case. I believe most the Contis are this way. The tread holds pretty well. The hand made cottons and silks - FMB etc. have the tread as a strip. The tread often bought from Italian owned Vittoria, made in Thailand glued on in France then sidewalls coated. These are generally the best rolling tires, the best feel.

Trainer have rollers that cause the tire to deform quite a bit more than normal flat road riding. If riding on rollers the deformation is part of the resistance. Anyway keep bending a glued on case back and forth and the tread will be more prone to come off. A GP4000 - eh, don't know. That is a great clincher, and as a pure trainer tire, I wouldn't use it, but for warming up and periodic use seems fine. My wife used a GP4000 on her rear solely for about 2-3 hours/week on a 2.5" roller. The tire came apart about a decade after first use. That is not so bad.
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Old 05-26-19, 06:10 AM
  #22  
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Originally Posted by gregf83 View Post
I'm curious what type of trainer you are using and the diameter of the roller contacting the tire. I've always used GP4000s on a KK trainer and have never observed any tire damage. The reports of tire-eating trainers I've seen usually indicate a small diameter tire roller.
cyclops fluid 2
i haven't used my trainer in 6 months so I'm not sure what went wrong. I don't remember using the brakes but i don't see what else could have caused this.
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Old 05-28-19, 10:33 AM
  #23  
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It looks like a skid patch to me.

Maybe it was there & the trainer buffed it up to be more noticeable.

Man, chicken little is alive and well around here!
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Old 05-28-19, 10:55 AM
  #24  
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Originally Posted by woodcraft View Post
.Man, chicken little is alive and well around here!
It's a $40 part.

If the OP has questions/doubts about continuing to use it, I'd replace it.
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