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Do indoor trainers damage seat stays??

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Do indoor trainers damage seat stays??

Old 01-03-07, 11:02 AM
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Clutch49
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Do indoor trainers damage seat stays??

I was at my local bike shop the other day talking with a few people and the topic of rear stays (especially carbon) being damaged due to excess pressure when locked into an indoor trainer came up. I never thought about this before but can it be true? It does make some sense to me. Our bikes aren't designed for trainers, so could there be such a thing as too much pressure on the rear fork when all the downforce weight is put onto it?

What are your thoughts on this???
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Old 01-03-07, 11:04 AM
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My Trek 5200 has been locked on my trainer since June. I'm not worried about it.
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Old 01-03-07, 11:06 AM
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Lots of discussion threads this morning. I would not be concerned with a aluminum frame but I suppose there will be a argument out there concerning CF
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Old 01-03-07, 11:09 AM
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Originally Posted by Clutch49
<snip>What are your thoughts on this???
...I think there are a lot of non-technical people who think they're special just because they stayed at a Holiday Inn.


BTW - the anser is: "It's carbon. It going to explode anyway."
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Old 01-03-07, 11:17 AM
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I don't put my good bike in the trainer... I bought another frame for the trainer and wet winter rides. Thats just me. I've never had a bike fail from the trainer.

cheers-
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Old 01-03-07, 11:20 AM
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Originally Posted by Psimet2001
BTW - the anser is: "It's carbon. It going to explode anyway."
Wrong! Just plain wrong! Everyone knows, carbon is going to melt, not explode! Especially if it's exposed to sunlight. After all, it's just plastic, ya know. You shoulda stayed in that Holiday Inn last night.



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Old 01-03-07, 11:27 AM
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Originally Posted by 'nother
Wrong! Just plain wrong! Everyone knows, carbon is going to melt, not explode! Especially if it's exposed to sunlight. After all, it's just plastic, ya know. You shoulda stayed in that Holiday Inn last night.




That's right. Just look at any Pinarello F4:13 carbon fork.
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Old 01-03-07, 11:30 AM
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Ive had my Cannondale R700 straped to my trainer for a month or more... it hasnt damaged it at all.
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Old 01-03-07, 11:31 AM
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Originally Posted by 'nother
Wrong! Just plain wrong! Everyone knows, carbon is going to melt, not explode! Especially if it's exposed to sunlight. After all, it's just plastic, ya know. You shoulda stayed in that Holiday Inn last night.

It actually is "just plastic". Its carbon fiber reinforced plastic.
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Old 01-03-07, 11:35 AM
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Originally Posted by ranger5oh
It actually is "just plastic". Its carbon fiber reinforced plastic.
Exactly. So you can see why it will melt, not explode.

Also I heard it gives off toxic fumes, and it will erase the hard drives in your computer. One other side effect is that it seems to render many forum users incapable of recognizing sarcasm.
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Old 01-03-07, 11:40 AM
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either way, melt or break, it can only be catastrophic


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Old 01-03-07, 11:44 AM
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I am not going to say I am some kind of an expert but seriously, I would not be worried about your bike breaking in a trainer.
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Old 01-03-07, 11:44 AM
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To actually contribute to this thread:

I think there are probably some variables in this. #1 is how much you tighten the trainer on the skewer. It seems logical that the skewer is taking all the stress, but I think some report than can see the stays move in when really cranked down. I cannot verify or deny this. #2 is how much stress you put on your bike when training. The more you are sort of smooth and not moving back and forth the less stress on the frame. If you are essentially standing and sprinting with everything you go you are putting a lot more stress on the frame.
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Old 01-03-07, 12:07 PM
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Originally Posted by indygreg
To actually contribute to this thread:

I think there are probably some variables in this. #1 is how much you tighten the trainer on the skewer. It seems logical that the skewer is taking all the stress, but I think some report than can see the stays move in when really cranked down. I cannot verify or deny this. #2 is how much stress you put on your bike when training. The more you are sort of smooth and not moving back and forth the less stress on the frame. If you are essentially standing and sprinting with everything you go you are putting a lot more stress on the frame.

My point was a simple way of saying...

I don't see this stress being out of the tolerances for the frame. IE - you would really have to torque that thing to get it to even stress. Take a video if that happens cause I want to see the first trainer crash.
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Old 01-03-07, 12:36 PM
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depends on the bike. when i was talking to seven when i got my bike they were telling me that if i were to get a certain type of tubing for my stays that i wouldn't be able to ride it on the trainer... luckly i didn't have enough money for that bike. i put many hours with my carbon bike on a trainer & had no problems, but i also did not put a lot of force out either.
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Old 01-03-07, 12:53 PM
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One more reason to ride rollers!
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Old 01-03-07, 01:20 PM
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Think of the force of a 200lb rider going 25 mph into a small pothole. The force generated by that has to be orders of magnitude higher than any stress your putting on the frame on the trainer.

If the bike is so weak its going to fail on the trainer, better there than at 35 mph in a group sprint finish.
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Old 01-03-07, 01:46 PM
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Originally Posted by Psimet2001
...I think there are a lot of non-technical people who think they're special just because they stayed at a Holiday Inn.


BTW - the anser is: "It's carbon. It going to explode anyway."
This forum is full of them....and it's a Holiday Inn Express.
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Old 01-03-07, 01:46 PM
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There are a few manufacturers (well at least one) that say riding the bike in a trainer is an “unintended use” and thus voids the warranty. I can’t remember what company it was right now, but I’m sure of it.

I use an old steel bike I bought for like $120 out of the newspaper (Centurian “Dave Scott” Ironman) in my trainer. Even if the frame would be fine, I don’t see the point in wearing out my nice drive train parts during the winter. It’s also nice in that I just get to leave the bike shackled to the trainer, instead of always having to reinstall it.
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Old 01-03-07, 01:50 PM
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Originally Posted by merlinextraligh
Think of the force of a 200lb rider going 25 mph into a small pothole. The force generated by that has to be orders of magnitude higher than any stress your putting on the frame on the trainer.

If the bike is so weak its going to fail on the trainer, better there than at 35 mph in a group sprint finish.
bingo. i think this sums it up well enough. also think about the flex a frame encounters when a big dude is sprinting toward the finishing line at 1600watts. the comparative stress on a trainer just doesn't seem to be enough to damage anything.
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Old 01-03-07, 01:52 PM
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Originally Posted by 'nother
Exactly. So you can see why it will melt, not explode.

Also I heard it gives off toxic fumes, and it will erase the hard drives in your computer. One other side effect is that it seems to render many forum users incapable of recognizing sarcasm.

It's also responsible for male pattern baldness.
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Old 01-03-07, 01:56 PM
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Originally Posted by timmhaan
bingo. i think this sums it up well enough. also think about the flex a frame encounters when a big dude is sprinting toward the finishing line at 1600watts. the comparative stress on a trainer just doesn't seem to be enough to damage anything.
But it's a different KIND of force. The pothole generates linear force, while the trainer generates twisting force as the bike has to hold up the weight of the rider and, being immobilized side to side, it also resists the normal side to side motion of a rider.
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Old 01-03-07, 02:01 PM
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Originally Posted by nycphotography
But it's a different KIND of force. The pothole generates linear force, while the trainer generates twisting force as the bike has to hold up the weight of the rider and, being immobilized side to side, it also resists the normal side to side motion of a rider.

You don't think there's a twisting force on the frame when your pulling up one bar as hard as you can, and putting all your weight and force on the opposite crank in a sprint?


I'd be willing to bet you put a CF frame in a trainer, and a steel bike in a trainer, that the steel frame will fail first because it will rust through from all the sweat. I've know people to ruin steel and AL frames from sweat on trainers from years of use. Never known anyone to break a CF frame in a trainer.
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Old 01-03-07, 02:04 PM
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I dont think your seat stays are touched by the trainer unless you have a very unusual trainer. My rear wheel is supported by the QR resting in metal cups. The cups are tightened towards each other compressing the QR (solid metal) on each side against the dropouts (solid metal)on each side against the rear wheel hub. Now if you have a CF hub (Mavic ES for example) it would appear that some sort of melting explosion is imminent.
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Old 01-03-07, 02:16 PM
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Originally Posted by curiouskid55
I dont think your seat stays are touched by the trainer unless you have a very unusual trainer. My rear wheel is supported by the QR resting in metal cups. The cups are tightened towards each other compressing the QR (solid metal) on each side against the dropouts (solid metal)on each side against the rear wheel hub. Now if you have a CF hub (Mavic ES for example) it would appear that some sort of melting explosion is imminent.

The issue is not so much the seat stays are coming into contact with the trainer but that the trainer is holding the rear end firmly enough that the swaying of the rider and the rest of the bike is twisting the rear forks and that the rear end of the bike is absorbing all of the pressure in that one specific area.
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