Rear Deraileur Pulleys have different 'spin rates', 6 months old: Triathlon Forum: Slowtwitch Forums

Rear Deraileur Pulleys have different 'spin rates', 6 months old

Apr 9, 17 14:43

So I had LBS rehab my 6 month old TT equipped with eTap. We had the RD off and I started spinning the pulleys. One of the pulleys had free spin like I could flick it and it would spin several rotations. It actually seemed kind of wobbly as well.

The other pulley seemed to spin differently. I couldnt flick and spin it and it seemed overall more stable.

LBS said not to worry but why would there be a difference at all and does that mean one is failing? Again only 6 months old.

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Re: Rear Deraileur Pulleys have different 'spin rates', 6 months old [Johnnyfever] [ In reply to ]

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esuuv

Apr 9, 17 15:05

Post #2 of 5 (682 views)

my understanding is that the top pulley is the guide pulley - this has a little side to side float to account for the gears not being perfectly aligned, this one will spin more freely.

The lower pulley is the tension pulley, this one is designed to be a little less free and has no side to side float.

All seems normal - shimano is exactly the same.

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Re: Rear Deraileur Pulleys have different 'spin rates', 6 months old [esuuv] [ In reply to ]

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Johnnyfever

Apr 9, 17 15:10

Post #3 of 5 (680 views)

Hmm...Great!! You sound confident enough that Im just gonna let this go and it makes sense. I actually cant remember which one was the free spinner. It was a week out of a 70.3 and I just wanted things together, then assess later. Thanks again for answering!

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Re: Rear Deraileur Pulleys have different 'spin rates', 6 months old [Johnnyfever] [ In reply to ]

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jkhayc

Apr 9, 17 17:06

Post #4 of 5 (616 views)

normal

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Re: Rear Deraileur Pulleys have different 'spin rates', 6 months old [esuuv] [ In reply to ]

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Johnnyfever

Apr 9, 17 17:09