Bike Forums - View Single Post - Larger pulleys.....

10-13-20 | 06:03 AM

#57

Road Fan

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Joined: Apr 2005

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From: Ann Arbor, MI

Bikes: 1980 Masi, 1984 Mondonico, 1984 Trek 610, 1980 Woodrup Giro, 2005 Mondonico Futura Leggera ELOS, 1967 PX10E, 1971 Peugeot UO-8

Quote:

Originally Posted by Lemond1985

I have a couple Altus RD's that use the large pulleys. I suspect that the design allows the quick snappy shifts you get with a short cage (vs long cage) RD, but you get the extra chain wrap of a long cage RD. Brilliant idea, and I think it will catch on gradually, as more people run 32 and 34 tooth cassettes on their road bikes.

The Altus RD's are pretty heavy though, so I hope we start seeing the large pulleys on some higher end, lighter RD's.

If the shifting is really quicker and more accurate, probably the larger upper pulley reduces the free length of chain in the rear, since the chain is a little closer to the cassette teeth when it rolls off the pulley.

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