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Tires got shredded on the trainer last night.....what's up?(11 posts)

Tires got shredded on the trainer last night.....what's up?ATLien
Jan 29, 2003 7:10 AM
Put in an hour of high spinning on my trainer last night and when I got done the rear tire looked like someone had taken a cheese grater to it and little pieces of rubber were all over the floor. Do I need more tension between the trainer/wheel? My tire pressure was same as my road set-up (110psi) and I thought I had the roller set correctly, but apparently not. How much tension/pressure on the rear wheel is too much vs not enough so that you don't get slippage? I'm training on a kurt kinetic road machine if that makes a difference. Plus, I probably just seriously shortened the life of a michelin pro race so I'm kinda pissed at myself.

Any thoughts?
re: Tires got shredded on the trainer last night.....what's up?DougSloan
Jan 29, 2003 7:15 AM
Use just enough pressure so that the tire does not slip. You may have had too much.

Also, check to see if the wheel is 90 degrees to the roller. If not, it could be working back and forth, building up heat.

I'd never use a tire like a Michelin Pro Race on a trainer, except maybe a warm up for a race. Way too soft (and expensive). Get another cheap wheel and mount old or cheap tires on it to use.

re: Tires got shredded on the trainer last night.....what's up?HillRepeater
Jan 29, 2003 7:30 AM
Trainers are hard on tires, period. You shouldn't use a nice, soft rubber race tire - get something hard and cheap.

That said, I've noticed a lot more damage to tires when the tension was too low. The slipping of the tire on the roller really shreds the rubber. As long as I run it tight, it's ok.
Cheap's the way to goOldEdScott
Jan 29, 2003 7:40 AM
More than 3000 trainer miles ago, I put a 27 in. WalMart Shen on my beater trainer bike. $7.99, I think. Still going strong with none of that black dust/early demise 'good' tires suffer.
2nd the Shen tire.getoffmywheel
Jan 29, 2003 10:33 AM
I burned through all of my old riding tires I had been saving and picked up one of these at a local shop. 2 hours on the trainer with some sessions near threshold with decent resistance and no shredded rubber or wear.

The best part is not having to clean the shredded rubber.
I'm also using a Kurt Kinetic (road) with Michelins...SS_MB-7
Jan 29, 2003 7:42 AM
I'm also using a Kurt Kinetic (road) with a Michelin Axial Pro rear tire (100psi). I have not experienced any problems so far....granted, I've only had 3 rides on it, but one was a 3 hr endurance ride.

Make sure you don't have too much pressure on the tire. Back off the resistance unit completely. Then, bring the roller up to the tire so that it just touches. Now, add 2 turns. I tried 1.5 turns but found I had some slippage under heavy pedalling.

BTW, what a smooth and solid trainer!

Ride Hard,
Mike B.
I'm also using a Kurt Kinetic (road) with Michelins...toronto-rider
Jan 29, 2003 7:50 AM
I also have the same trainer. Do you mean 2 complete turns of the knob, the instructions also say 2 turns but if I set it up just so it touches and then add 2 complete turns (back to starting position) the tension on the tire seems too much. I use a cheap tire and the 1st couple of rides there was a lot of tire left on the floor. I called Kurt and they said to just have enough tension so the tire does not slip.
Otherwise great trainer.
Yes, 2 complete turns as per the manual....SS_MB-7
Jan 29, 2003 7:58 AM
Page 3 of my manual states for "Bike Mounting", step #7:
Setting the tension of the resistance unit against the bike tire is user controlled, by adjusting the knob as shown in Figure 5. Turn adjustment knob (part D) clockwise until roller touches the tire; then turn two additional turns to obtain ideal roller tension.

Ride Hard,
Mike B.
"sobbing" I'm soooo proud of you..."sobbing"Akirasho
Jan 29, 2003 7:54 AM
... I applaud anyone who has the wherewithall to tolerate the abject boredom of the average trainer enuff to shread a rear! Keep up the good work!

Be the bike.
need more tension, most likely.jw25
Jan 29, 2003 12:09 PM
I've seen this happen a few times. The first, the rider didn't dial in enough tension, so the roller was making intermittent contact with the tire. Every time it made contact again, a little of the tire would burn off, abd she ended up with a squared-off tire and a collection of rubber shreds on the floor, not to mention a black ring of rubber on the roller.
The second time, the rider was using a non-round wheel, with the same results.
I'd check the true of your wheel first, since it's easy.
If it's okay, you probably needed more tension. Every trainer varies, but in general, you want enough to eliminate slippage, plus a quarter to half turn more. Also, it's not the best idea to use race rubber on the trainer. Old race tires, sure, but not fresh ones. I like using the old, untrustworthy race tires on the trainer, since the softer rubber gives more friction, but you can use some el-cheapo slicks (and I stress slicks - no tread at all) to save the good rubber for the outdoors.
need more tension, most likely.toronto-rider
Jan 29, 2003 1:42 PM
I have 2 rings on the roller, I know that my wheel is not true, will I damage the roller by not having a true wheel?