Ultegra chainring question

General bike chat that does not fit elsewhere
rhurbarb
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Ultegra chainring question

Postby rhurbarb » Sat Sep 21, 2013 14:37 pm

Hi .Im currently running a 52 tooth ultegra chain ring on my Cube bike and i was just wondering possibly if there is a 56 teeth chain ring on the market which would fit this system , If not would the only option being a 53 teeth without changing the the crank arm?

regards Rhurbarb

DavidJB
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Re: Ultegra chainring question

Postby DavidJB » Sat Sep 21, 2013 15:11 pm

Why would you want a 56 chain ring!?

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declan1
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Re: Ultegra chainring question

Postby declan1 » Sat Sep 21, 2013 15:27 pm

As above why on earth do you want a 56t chainring?!?

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I have no idea what's going on here.

diamonddog
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Re: Ultegra chainring question

Postby diamonddog » Sat Sep 21, 2013 15:36 pm

:shock: :shock: :shock: :shock: are you Schwarznegger?

Schobiedoo
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Re: Ultegra chainring question

Postby Schobiedoo » Mon Sep 23, 2013 05:00 am

You must be thinking of replicating Tony Martin, I think he uses one on his TT bike.

I would imagine that if you can get one with the correct BCD then it would fit without a new crank, however I think it's unlikely that you can get one to fit exactly unless Shimano make one for your particular model. You'd also have to check your derailleurs, as I understand they have a maximum spread on gears, maximum sprocket, etc.

gr1
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Re: Ultegra chainring question

Postby gr1 » Mon Sep 23, 2013 06:48 am

Dura ace make 56t chain rings so if you got one from the same series ie 7900 DA for 6700 ultegra I see no reason it won't fit.

Gozzy
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Re: Ultegra chainring question

Postby Gozzy » Mon Sep 23, 2013 08:06 am

Series doesn't matter, speed and BCD are what counts.

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Bobbinogs
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Re: Ultegra chainring question

Postby Bobbinogs » Mon Sep 23, 2013 08:40 am

Miguel, is that you?

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smidsy
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Re: Ultegra chainring question

Postby smidsy » Mon Sep 23, 2013 09:02 am

Gozzy wrote:Series doesn't matter, speed and BCD are what counts.


Speed does not matter either, BCD is king.
Yellow is the new Black.

gr1
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Re: Ultegra chainring question

Postby gr1 » Mon Sep 23, 2013 16:22 pm

Gozzy wrote:Series doesn't matter, speed and BCD are what counts.


I meant that there is no point buying DA 9000 as it will only work on ultegra if the OP has 6800.

As he has a 52t already I assumed it to be 130 BCD anyway.

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dennisn
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Re: Ultegra chainring question

Postby dennisn » Mon Sep 23, 2013 20:10 pm

I'm still waiting, as I'm sure a few others are, to find out what possible use a 56 tooth ring will be. :roll:
I sense troll, but on the off chance that this is a serious question, by a real person, well, I've just got to meet this guy.

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GiantMike
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Re: Ultegra chainring question

Postby GiantMike » Mon Sep 23, 2013 20:21 pm

I have a 55t (I think it's a 130BCD) chainring if you want a cheap one. I think it's a 10 speed one that was previously used for TTing. Drop me a PM if you're interested.
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rhurbarb
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Re: Ultegra chainring question

Postby rhurbarb » Tue Sep 24, 2013 18:00 pm

Hi Guys .I want to improve my speed downhill .The 52 teeth doesnt seem enough.Im a kinda downhill speed freak i guess,and most of the time i suck on hills .But i seem to be ok with downhill and sprints. I thought a 56 might be a little over kill.so either a 53teeth or 54 maybe .Regards rhurbarb

ps sorry about the delay back .Thank you guys for your replies

diamonddog
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Re: Ultegra chainring question

Postby diamonddog » Wed Sep 25, 2013 11:26 am

If 52 is not enough you should be on a pro team they usually use a 53. :shock:

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Grill
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Re: Ultegra chainring question

Postby Grill » Wed Sep 25, 2013 11:33 am

52 will be 110 bcd so no, you can't run a 56.

@rhubarb- You're doing it wrong. Just tuck, it will be faster than even the biggest chainring. Aero > Gearing
English Cycles V3 | Scott Plasma 3 TT | BMC TrackMachine TM01 | Ritchey Road Logic | Scott CX Team

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smidsy
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Re: Ultegra chainring question

Postby smidsy » Wed Sep 25, 2013 12:01 pm

rhurbarb wrote:Hi Guys .I want to improve my speed downhill .The 52 teeth doesnt seem enough.Im a kinda downhill speed freak i guess,and most of the time i suck on hills .But i seem to be ok with downhill and sprints. I thought a 56 might be a little over kill.so either a 53teeth or 54 maybe .Regards rhurbarb

ps sorry about the delay back .Thank you guys for your replies


Cadence is probably too low. Even with a 56 you will still run out of leg speed if the hill is steep enough.

Watch the pros, they do not pedal all the way down a hill. Freewheel when you run out of cadence and get tucked in, that is the way to go fast down a hill.
Yellow is the new Black.

diamonddog
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Re: Ultegra chainring question

Postby diamonddog » Wed Sep 25, 2013 12:48 pm

smidsy wrote:
rhurbarb wrote:Cadence is probably too low. Even with a 56 you will still run out of leg speed if the hill is steep enough.

Watch the pros, they do not pedal all the way down a hill. Freewheel when you run out of cadence and get tucked in, that is the way to go fast down a hill.

^^This +1

964Cup
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Re: Ultegra chainring question

Postby 964Cup » Wed Sep 25, 2013 21:58 pm

52 could be either; if it's a 52/36 mid-compact, it's 110. If it's a 52/39, it's 130.

In any case 52x11 is 71kph (44.4mph) at 120rpm.

Read this: http://mccraw.co.uk/wind-resistance-cycling-speed/

At that speed, any further gains will need so much power that you'll be better off tucking to reduce drag and freewheeling.

rhurbarb
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Re: Ultegra chainring question

Postby rhurbarb » Thu Sep 26, 2013 19:23 pm

Thanks guys interesting points put in here.As for the chainring i I was mistaken on the teeth size..i thought i was using a 52 but i have now found out its a 50...The reason why i thought i had a 52 is because the chainring was originally a triple chainset setup with a 52 toothed chainring ,i had it changed at the shop to a double but didnt know the double large chainring was smaller ..I had a word with my local shop and he seems to think the ulterga chain rings have different size holes drilled for the fixing bolts .
so going to be whatever fits i guess or change the crank with new arms .As for airflow my chin is always on skimming the stem .im not sure whether to sit on the frame as that feels too unstable to me ...I really appreciate the feedback on this.. regards Rhurbarb

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Grill
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Re: Ultegra chainring question

Postby Grill » Thu Sep 26, 2013 20:28 pm

Sitting on the frame is the only way to descend. If that doesn't work then get a push. You see these guys peddling?
https://www.youtube.com/watch?v=-kZSzB4kEE8&noredirect=1
English Cycles V3 | Scott Plasma 3 TT | BMC TrackMachine TM01 | Ritchey Road Logic | Scott CX Team


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