Ditching the inner ring

Discuss light weight issues concerning road bikes & parts.
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Pantani
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Joined: Tue Jan 11, 2005 11:40 pm
Location: Eire

by Pantani

The post about overshoes brought this to my mind. I think its well established that there is an aero advantage in a TT from ditching the inner chainring. However, I've been reluctant to do it for fear that it might compromise the stiffness of the chainset. Has anyone any experience of riding with just the big ring in this context?

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AED
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Joined: Sat Apr 30, 2005 10:26 pm
Location: Lithuania

by AED

In TT you're riding smoothly. So I think stifness isn't very important.
But if you take of your little chainring I don't think that you'll win. A good cyclist can win even with simple bike with aerobars ;)

by Weenie


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Boonen
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by Boonen

you can easily skip the inner ring, no problems here, just use either spacers or smaller chainringscrews. (Theoretically there isn't a difference in stifness weather you use one or two rings)
I would advise you to keep your front derailleur though, just in case something would go wrong.

weiwentg
Posts: 204
Joined: Mon Feb 09, 2004 8:16 pm

by weiwentg

Boonen wrote:you can easily skip the inner ring, no problems here, just use either spacers or smaller chainringscrews. (Theoretically there isn't a difference in stifness weather you use one or two rings)
I would advise you to keep your front derailleur though, just in case something would go wrong.


David Millar would similarly advise you to keep your front derailleur ... remember the TDF prologue in 03, which he nearly won? he had a single ring and no front derailleur. his chain came off just before the finish. he threw a fit, said his DS made poor equipment choices. certainly the now ex-DS may have, but after riding bikes that long as a pro he should have known these things.

Joel
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by Joel

Yes keep the FD or you won't finish :lol:

megman
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Location: UK

by megman

You can get special chainrings with larger teeth when using a single chainring setup. Supposedly to allow you to remove the FD, but I wouldn't

Pantani
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Location: Eire

by Pantani

Thanks for the advice. On Irish roads there would be no question of removing the derailleur as the chain would definitely come off.

As regards AED's point - I'm already capable of winning TTs - but optimising every aspect of performance is what TTs are all about - especially if you are 1m70 and 55 kilos.

Regarding stiffness - I would have thought that the inner ring plays some role in stiffening the spider. However, thinking about it more I suppose there really are only radial loads on the chain ring and all the axial loads are on on the cranks themselves.

I'll take the inner ring off for the next TT in a couple of weeks time and see what happens.

520 Dan
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by 520 Dan

I think the stiffness issue is why FSA and Shimano started producing the TT specific rings. They're pretty beefy.

by Weenie


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Erez_Pinarello
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by Erez_Pinarello

I missed the local national chamionships due to not having FD

the cain comes off if the chainline is not straight!!!!

do not loose the fd!!!

its not worth the weight saving.


also check www.tisobike.it for their triathlon chainrings - they are reinforced in the rear and do not flex in the large sized 55-56 :-)

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