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Rear Derailleur (105) Squeals During Shifts

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Rear Derailleur (105) Squeals During Shifts

Old 03-15-09, 07:54 PM
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Rear Derailleur (105) Squeals During Shifts

Starting yesterday Iím hearing what Iím calling a squeal from my 105 rear derailleur during shifts (up or down). Since the actual shifting times are short, it comes out like a chirp. But if I push the shift lever in enough to start moving the RD, but before it clicks over to the next gear, the chirp will actually be a squeal that will continue until I either release the shift lever, or press all the way through to cause it to shift.

The bike is only 2.5 months old with 2500 miles. At 1880 miles, the LBS did their full tune up on it instead of their usual 60-day adjustment because of the mileage. But the squeal only began yesterday after about 2350 miles. I put the bike on the stand this morning and confirmed the noise but couldnít isolate it, as I couldnít hold the shift lever just so and still put my ear back by the RD. I totally readjusted the RD starting with a slack cable; got it all shifting normally; oiled the chain; and went riding. Though not as pronounced and as frequent as yesterday, itís still there about 1/3 or 1/2 of the shifts.

Not sure if itís an adjustment problem or a bad pulley that squeals when side forces are placed on it during RD movement from one cog to the next. Itís dead silent once the shift is made. So, whatís your experience say: adjustment or bad pulley?
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Old 03-15-09, 08:04 PM
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The chirp is probably coming from the tensioner wheel rubbing the cage, especially if gthe noise comes when you are pedaling. When you shift you are putting lateral pressure on this wheel and I'll bet it is just rubbing the cage on the side of this wheel.. Put a drop of oil on either side of both or your tensioner wheels between them and the cage. This should do the trick. If not you can buy replacement wheels for the tensioner and that should fix it.
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Old 03-16-09, 02:18 AM
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The pulleys definitely need lubing, but I would recommend doing the job properly by taking both pulleys off and cleaning them up before giving them some new oil or grease.

For the more experienced people out there: What is better to use in this situation? I've always put bearing grease in and around the pulleys, but was recently reading about using light oil instead. Which is better?
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