Jul 20, 2001 11:01 AM
|This is a second request on the question. Do I switch out the derail pullies when I switch out the cassette, chain and small chainring as they are nearing the end of their service life. They are working okay and not chewed up. Necessary @$20 for alu ones? And is 4K about normal life for a cassette and chainring on Ultegra?|
|Don't do it...||MrCelloBoy|
Jul 20, 2001 12:27 PM
|At least with aftermarket pullies. No one I know has had good luck with the pretty looking pulley rollers. From what I understand the OEM pulleys have a perfect amount of play for the system they are part of. The aftermarket ones have less play and cause the system to work less smoothly.|
|Don't do it...||grzy mnky|
Jul 20, 2001 2:17 PM
|Yes, my understanding is that Shimano patented the floating pulley design. You don't see it on Campy or SRAM stuff, and certainly not on aftermarket stuff. |
Just pop the retaining bolts out clean, inspect, lube and reassemble. Order the exact replacement parts if new stuff is needed. Once cleaned up you'd be amazed at how long these things continue to keep going.
|Don't do it...||Lone Gunman|
Jul 20, 2001 2:22 PM
|I keep a clean drivechain and they work fine. They are a moving paet that I have always questioned if they need replaced when parts such as cassette and chain and chainrings wear out. But the 4000 mile question...Is it time? They are getting a little noisy and lube is not quieting the noise.|
|Replace 'em||grzy mnky|
Jul 20, 2001 3:54 PM
|If lube isn't dooing it then I suspect wear. The bushing is ceramic so it is going to be fine. However, I shudder at the thought of what Shimano charges for a couple o'bits of plastic.... |
Can't really go by miles - my stuff has way more than 4K, but it's fine.
Jul 20, 2001 4:12 PM
|The only reason to replace pullies is if they are worn. I tried some fancy aftermarket pullies and they seem to work fine, but you do have to dial in your rear deraileur better because there is no slop in the pulley to take up the difference. They also make a little more noise then the plastic, but the sealed bearings are very smooth even after alot of rain rides. I always thought the upper ceramic bushing pulley of Ultegra had too much resistence and mine started to become noisy. If you can, find a Dura-ace pulley or another lower sealed Ultegra pulley and replace just the upper.
4,000 miles is a little on the low side, but normal for the cassette if you did not change your chain often, but I usually get more out of my chainrings.
|re: Pullies....||Lone Gunman|
Jul 20, 2001 5:16 PM
|The noise is from the cassette and chain not the pullies. I changed the chain out @ 3K and I am a spinner so probably 90% of my miles were spent in the 42 chain ring and I am not certain that the chainring needs switched out either. On the pullies, I think I will just clean and grease as opposed to replace.|| |