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Training & Nutrition Learn how to develop a training schedule that's good for you. What should you eat and drink on your ride? Learn everything you need to know about training and nutrition here.

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Old 10-04-10, 06:36 PM   #1
adam_mac84
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Trainer blowouts, what causes them?

I was riding my trainer tonight. I am usually a rollers guy, but wanted to get some higher intensity work in to help a bit with my XC short commings.

Anyhow, i am riding 23c tire, 120 psi (within recommendations), at moderate intensity with occasional 'sprints' of higher resistance maintaining cadence.

26 minutes into the ride KABOOM, thought it was a drive by, and now this:




On a borrowed bike no less, now i owe him a tire and tube.

I am 220# FWIW, moderatly strong rider i guess... tire was warm, and the fluid 'radiator' was pretty warm as well, but i figure this is normal, but like i said, i usually just do 'base' miles in the off season with the rollers to keep the legs moving
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Old 10-04-10, 07:31 PM   #2
malux
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that boom must have been something to hear. At least the tube will be cheap..
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Old 10-04-10, 07:55 PM   #3
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Yea, i thought i might have made some gang bangers mad, but then i realized that i live in a community with nearly all 75+ y.o. people who give me weird looks when i strut outside in my lycra... lol.

I definitely will stick to the rollers if this is going to be a consistent thing with me. Unfortionatly i cannot work as well with speed changes and standing hard efforts with my rollers
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Old 10-04-10, 10:02 PM   #4
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increase the tire pressure, and reduce the amount that the roller pushes into the tire. Excessive deflection of the tire makes the tire get hot which makes the tire weak....then boom
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Old 10-05-10, 05:22 AM   #5
adam_mac84
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Quote:
Originally Posted by merlin55 View Post
reduce the amount that the roller pushes into the tire.
I will have to check if this is an option on my trainer... it is a traveltrac fluid trainer.

I was thinking of lowering the pressure so that when the tire heats up it would not increase pressure to a failure level. But what you say makes sense as well
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Old 10-05-10, 10:21 AM   #6
malux
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Originally Posted by adam_mac84 View Post
Yea, i thought i might have made some gang bangers mad, but then i realized that i live in a community with nearly all 75+ y.o. people who give me weird looks when i strut outside in my lycra... lol.
You might have killed someone with that boom Was there an ambulance outside afterwards?
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Old 10-05-10, 04:42 PM   #7
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You might also consider getting a wheel with a proper trainer tire on it, and use that for trainer work.
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Old 10-05-10, 05:54 PM   #8
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this is the trainer i have. i cannot adjust how hard the tire pushes on the roller. My wife rides with no problems but is about 80# lighter than me. I will have to try a trainer tire, but i am not sure how different it will be, because the tire wasn't worn out necessarily on the other tire i was using
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Old 10-05-10, 08:15 PM   #9
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you need to run at least 115 psi, which will reduce the flex in the sidewall....and prevent blowouts...if you buy a larger tire like a 25 mm or 28 mm if it will fit, that will also increase life.

Years ago people were flipping their Ford Explorers when their tires blewout...in most cases due to underflated tires getting hot and then failing...inflation is what prevents the tire from excessive sidewall flex...which is what overheats the tire
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