So the majority of my rear ders in the parts bin have 10t, now I se current models have 11t design, (and the funky Dura-Ace model with a 13t pulley that looks huge)
Why the different count, what is the purpose?
I have a Shimano DX rear derailleur, what pulleys would be appropriate for replacements?
So the majority of my rear ders in the parts bin have 10t, now I se current models have 11t design, (and the funky Dura-Ace model with a 13t pulley that looks huge)
Why the different count, what is the purpose?
Bigger pulleys allow for more takeup without making the cage longer and don't bend the chain as much.
Quote:
I have a Shimano DX rear derailleur, what pulleys would be appropriate for replacements?
10t, you can't increase the pulley size because the larger pulleys won't clear the cage.
alex
joeball
Posted: Sat Jun 09, 2007 12:56 pm
Joined: 24 Jul 2005Posts: 6037Location: Ether
Great thanks, that makes more sense about more chain wrap. Shimano describes the 11t as making sure that the chain has alternating contact but I was having a hard time imagining why that mattered much.
Aaron
Posted: Sat Jun 09, 2007 3:54 pm
Joined: 25 Jul 2005Posts: 4645
It is just Shimano making things different so that you have to buy new. Similarly, MTB cranks now have a 12T difference between the middle and large. It used to be a 10T difference. A new front derailleur will not work on your old crank unless you buy a new chainring, or in many cases crankset, which means you also probably need a new BB.
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