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SRAM rear derailleur & pulleys

I'm overhauling son's bike, with SRAM Apex drive train. When re-assembling the rear derailleur cage & pulleys, I noticed the top pulley does [U]not[/U] have the intentional side-to-side play found in Shimnao & Campy deraillers. I believe this feature is (or was) a Shimano patent to facilitate index ... Read More »

Rear derailleur cannot be indexed correctly

Symptoms: rear Dura Ace 7800 will not index correctly. If I set the cable tension such that the chain will move from small to largest cog smoothly, then going from largest to smallest cog will be very slow (clank clank clank!) and sometimes it will take two shifts for the chain to move down 1 small ... Read More »

SRAM short-cage rear derailleur w/30t cog?

Quick Q: On one of my bikes, I'm running a short-cage SRAM Rival RD. Am thinking of putting a 12-30 cassette on, but the RD is rated for 28t cog max. I know with most Shimano RDs, you can get away with exceeding the max some, but I don't know if SRAM RDs have less room for error. I read about one ... Read More »

Rear derailleur failed! Not sure what happened...

I got up at 6:30 AM for a nice early bike ride to beat the heat. My bike had been on the trainer for the last several days. I generally put on the "stock" rear wheel when using the trainer and put on my "good" rear wheel for road biking. I removed the stock wheel in the same usual fashion, by undoin ... Read More »

Ultegra Di2 Rear Derailleur noise

I have a new Trek with Ultegra Di2 electronic shifting. It has 34/50 chainrings and 11/28 cassette, all standard. I hear a noise from the rear derailleur when I am coasting and hit a significant bump with the chain on the small chain ring (34). If the chain is on the large (50) chainring I usuall ... Read More »

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