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03-15-09, 07:54 PM
Starting yesterday I’m hearing what I’m 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 couldn’t isolate it, as I couldn’t 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, it’s still there about 1/3 or 1/2 of the shifts.
Not sure if it’s 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. It’s dead silent once the shift is made. So, what’s your experience say: adjustment or bad pulley?
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 couldn’t isolate it, as I couldn’t 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, it’s still there about 1/3 or 1/2 of the shifts.
Not sure if it’s 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. It’s dead silent once the shift is made. So, what’s your experience say: adjustment or bad pulley?