Evening, Anyone ever damaged their carbon frames on a smart turbo that clamps the frame at the drop outs (using a dirt without a rear wheel).
Just wondering.
Thanks,
Matt
Yes, trashed a carbon frame using a turbo and old back wheel with a threaded axle. The movement in the frame against the threads wore the dropouts and bollocksed the frame. Very annoying.
That is annoying. My post should have read direto.
I think it contributed to me knackered bb. Might be wrong but the bike being fixed and me trying a bit too hard caused the alloy bb bonded insert to come away. Might be wrong.
I have to ask daern, had you tightened it properly?
Matt I've had a aluminium BB unscrew with the BB cups from a Scott CR1, it was ridiculously light and clearly not glued in well enough (under normal riding - precession).
Probably worth noting that it's generally not recommended to use carbon frames on turbo trainers due to the greater stresses - e.g. when sprinting hard / high power the frame will take more lateral forces than when on the road (where it will be moving under you). Whether you are actually hammering it enough to cause concern is probably up to the individual.. (I've used mine on a TT without noticeable issue).
Thanks all.
I'm going to carry on using it but try a bike with thru axles instead. Spent a fortune on a turbo and the thought of buying an alloy bike to just use on the turbo is a irritating. Then again a £1000 frame cracking might also wind me up. Worse things happening at the moment though in the world I suppose!
Thanks,
matt
It shouldn't cause and issues if properly done up.
Drop outs wearing = not tight enough. BB shell = glue.
Bikes get a lot less battering in a turbo trainer than they would on the road (pot holes, vibration, braking stress). If worried, you could make a rocker board (plenty of projects on "t'internet")
I have to ask daern, had you tightened it properly?
So, obviously I thought I had and the obvious next statement is that I clearly hadn't!
In my case, the bike had carbon dropouts which were far more susceptible to abrasive wear than, say, alloy ones. I think a combination of not quite tight enough QR, threaded axle (so a very sharp surface sat on the frame) and the unnatural movement of my fat ass on the turbo probably acted together to cause the wear. In fact, it's possible that it was a single session that did it, which is a sad thought.
However it is, I'm much more careful now but can't really say whether I've fixed it or not as the turbo hasn't been out this year as I've stuck to riding outdoors!
Carbon frame damage from stationary turbo training is a myth !
https://zwiftinsider.com/will-indoor-training-damage-carbon-frame/
You could make up a DIY rocker plate to sit the turbo on, This must surely reduce the twisting forces that any frame will go through and better simulate real-world riding. The ones using a couple of sheets of plywood and some rubber balls seem pretty simple to construct??
Carbon frame damage from stationary turbo training is a myth !
https://zwiftinsider.com/will-indoor-training-damage-carbon-frame//blockquote >
That's me told then 😉
Its not a myth. Some of it is down to operator error but some of it is due to the bikes not being designed to be flexed from side to side with the axle fixed rigidly.
I have seen damage/failure to three carbon bikes that has only become apparent when put on a turbo.
A low end Bianchi where the carbon seat stays de-bonded from the dropout on the drive side. The second was a carbon trek where the seat stay cracked just above the dropout during a hard sprint. The third was another trek where the dropout split lengthwise at the chain stay on the drive side.
These could all be coincidence as the frames had been used on the road. I wasn't willing to put my carbon bike on my turbo because the seat stays are so thin looking. A mate uses the same bike on the same turbo and has been fine for about a year. I ended up buying a nice alloy road bike to use as a turbo/winter bike but it hasn't left the turbo yet.
A low end Bianchi
No such thing.
Frames are clamped in the front and rear drop outs to test for fatigue cycles. I can't see how a turbo is any different. I presume you ride frames that have been tested? I keep a spare bike on the Kickr all the time. It's not a large incremental cost. Doing it again, I'd just build one up out of cheap/spare parts, after all, you don't need brakes or a back wheel.
That’s me told then 😉
Well then probably this
“We spoke to a number of manufacturers and they all said if you set up your turbo correctly, your bike frame is going to be fine.”
Low end bianchi Via Nirone 105. The old version used to have carbon seatstays