Turbo - True or False

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15/10/2012 at 14:24

One bike shop tells me that on no account should a carbon framed bike be put on a turbo.

Other bike shop tells me it's no problem putting my ££££££££ on a turbo.

My wife tells me that if I buy another bike I'm a dead man walking.

Can I mix carbon and turbo this winter?

cougie    pirate
15/10/2012 at 14:25

Of course you can.

Look at any pro team warming up/ cooling down.  Carbon Frames and turbos. 

Lots of bike shops don't seem to know their arses from their bottom brackets. 

15/10/2012 at 14:30

Mine carbon bike is on my turbo. You need to clamp the rear wheel in place which squeezes the frame a smidge, but no harm done. Would be the same with an alu bike  I assume?

 

cougie    pirate
15/10/2012 at 14:32

I dont reckon theres any squeezing of the frame  - your wheel takes that and I dont think it would transmit to the frame. Unless you crushed your wheel ? 

15/10/2012 at 14:35

No, just a pinch. I use a turbo skewer as well, so that will dictate the width as well. Maybe I shouldnt have mentioned it, I dont want people clamping their wheels to an inch of their breaking point!

15/10/2012 at 14:36

Sounds like a load of bollo to me.

meface    pirate
15/10/2012 at 15:02

They claim it is something to do with the transmission of forces on the rear traingle. As I have an old steel frame on mine I have never worried about it.

Potentially it could reduce frame flex a bit I suppose. The bike doesn't move forwards - is this an issue? I don't think so. Maybe SlowEngineer can comment.

Yes the Pro's use turbos for warming up, but do they do main sessions on them, and do they care about the longevity of the frame?

s-1 is a bit of a bugger especially if you haven't got close to n+1

Road Bike
TT Bike
Mountain Bike
Pub/leisure Bike (so you can leave it somewhere)
Turbo Bike
Cross Bike/Winter Training Bike

So I make that 6 (and haven't got a Brompton i nthe list)

So if s-1=

15/10/2012 at 15:04

I'm sure everyone and their dog has seen this by now, but just in case, this is how fragile carbon road bikes are.

http://www.youtube.com/watch?v=7ZmJtYaUTa0

 

15/10/2012 at 15:12

my carbon framed bike has been used on the turbo for years and with my weight and power () it hasn't broken yet.   it's broken me a few times over that period though.....

15/10/2012 at 16:00

To be honest, if I was sure, I wouldn't have posted the question.

The shop that had the "don't turbo a carbon frame" attitude showed me two bikes that were - apparently - messed up by a turbo. Both issues were in the same spot on the rear triangle, and resembled barely visible hair lines - these, I was told, were caused by a turbo and the rocking side to side rather than forward motion - more than that, I was told that they were fractures of the frame.

One owner came in at the time and confessed to using a turbo with the bike, and looked less than impressed at the news.

Other bike shop is much like you lot - says it's bullsh+t and I should enjoy the bike which I bought from him.

I'm thinking about roller bars to be on the safe side.

15/10/2012 at 16:24

I can possibly understand some weak rear triangles cracking under excess turbo load but I don't see that these loads are likely to be any worse than causing damge by hitting a bombhole on the road which is a short, heavy impact.   my carbon framed Issac has done thousands of miles on all sorts of roads and turbo and is still good.

I took it to Colombia last December and some of the roads out there were shocking - shall we say non-existent tarmac at times so we were riding effectively off-road.  my only issue was a front hub flange which snapped off rendering the wheel defunct - the frame soaked up the hit that caused that no problem.

ooi - what is the frame 210??

Edited: 15/10/2012 at 16:25
AndyB99    pirate
15/10/2012 at 16:28

i dont buy it!!! the stresses put on to the frame on the turbo are soooo much less than the road will throw at it. i've had 2 carbon bikes and both have spent plenty time on a turbo....the skewer will prevent the frame from pinching and if the fron wheel has support under it and its fitted for you properly any force points will be exactly the same.

15/10/2012 at 17:29

Clamping your bike on a turbo probably will stress the frame in different ways than road riding will - it wouldn't surprise me if some manufacturers recommended you don't use their frames on a turbo.   I'm not saying it's a problem - I use a carbon TT bike on a turbo - but if it broke I wouldn't be admitting that if I was making a warranty claim.  Carbon frames are good at resisting forces in certain directions aren't they so forces in directions they aren't designed to resist might be an issue.  

I'd be more cautious about using carbon forks on something with a fork clamp though - like some competition rollers have and I think some early turbo trainers.   

meface    pirate
15/10/2012 at 20:59

Have had a bit of a think.

The skewer is fixed pretty solid. Normally when you apply power at the crank and handle bars (going proper hard) any side to side motion caused results in the whole bike swaying side to side. By fixing the skewer all of that twisting force would be applied to the reat triangle. This could be an issue.

If you are Driving Miss Daisy then can't see it being an issue. If you are really piling on the power I could this may apply unusual forces onto the rear triangle that would likely create the most stress at the crank end.

So possibly absolutely flat out sprints wrenching on the bars could cause a problem. Hard Tempo is unlikely to be a problem as the power is built more steadily and sustained.

I did watch the video and the guy is a very good bike rider, very smooth, the bike hardly takes a hard knock at all.

M..eface

17/10/2012 at 00:18

you can put any bike on a turbo.

you'll sweat all over it mind you.

most carbon bikes are expensive. OK the carbon won't rust but some of the other bits might. i'm thinking myself of buying a cheap £50 ebay bike for the turbo for this reason - then worrying about the aero bars.

 

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Doner Kebab    pirate
17/10/2012 at 09:44

^^ Chocolate teapot

 

18/10/2012 at 13:49

Ashtray on a motorbike

meface    pirate
18/10/2012 at 20:10
the5k runner wrote (see)

you can put any bike on a turbo.

like feck you can. I am now in A&E after a day of experimenting.

Penny Farthing - rear wheel a difficult fit and it tried to drag the turbo away
BMX - jumps too hard
Tricycle - wouldn't fit (If I had two turbos maybe)
Meldy - (don't include in final list)
ScootBike - no pedals
Unicycle - just powered forward and ploughed my face into the ground, broke my nose

Razor51    pirate
18/10/2012 at 20:31
18/10/2012 at 20:41

How long do you get before you can't edit a post any more......!?

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