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 Post subject: 10t or 11t
PostPosted: Fri Sep 28, 2012 10:11 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Tue Nov 03, 2009 2:43 pm
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Location: At the pinnacle of fuckwittery
A question of Jockey wheels

At which point do I need which amount of teeth in my rear mech?


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 Post subject:
PostPosted: Fri Sep 28, 2012 1:32 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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It doesn't really matter .


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 Post subject:
PostPosted: Fri Sep 28, 2012 2:27 pm 
Gold Trader / rb Rider / Special
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Wouldnt it have something to do with your ratio?
For example you have a longer cage with a larger ratio cassette/rings.


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 Post subject:
PostPosted: Fri Sep 28, 2012 8:28 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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one says yay, one says nay... anyone got any more conclusive info... :lol:


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 Post subject: Re: 10t or 11t
PostPosted: Fri Sep 28, 2012 8:42 pm 
Retro Guru

Joined: Mon Jun 04, 2012 10:02 am
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GT-Steve wrote:
A question of Jockey wheels

At which point do I need which amount of teeth in my rear mech?


Acording to wikipedia:

Cage length, when combined with the pulley size, determines the capacity of a derailleur to take up chain slack.

Cage length determines the total capacity of the derailleur, that is the size difference between the largest and smallest chainrings, and the size difference between the largest and smallest sprockets on the cogset added together.

A larger sum requires a longer cage length.

Typical cross country mountain bikes with three front chainrings will use a long cage rear derailleur. A road bike with only two front chainrings and close ratio sprockets can operate with either a short or long cage derailleur, but will work better with a short cage.

Manufacturer stated derailleur capacities are as follows: Shimano long = 45T; medium = 33T SRAM long = 43T; medium = 37T; short = 30T

Long story short:

If you're having trouble using all the gears on your bike, and having trouble finding a longer cage deraileur, running bigger jockey wheels helps take up more chain slack and allows a bigger useable gear spread.

Otherwise you don't need them.


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