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General Category >> Rubber Side Down! >> movement of driven pulley normal?
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Message started by rijopiatt on 03/12/15 at 18:12:53

Title: movement of driven pulley normal?
Post by rijopiatt on 03/12/15 at 18:12:53

I just removed and reinstalled my rear tire for the first time on my 2012 S40. While still jacked up, I noticed that I could move the driven pulley laterally about 1/32" when I was finished. I didn't really check or notice this when I was removing the tire. Is this normal?

Rick in Indiana

Title: Re: movement of driven pulley normal?
Post by Dave on 03/13/15 at 03:38:03

Unfortunately....the rear pulley hub is a bit weak of a design. The pulley hub rides on a single ball bearing, and the backside where the pulley hub slides into the wheel hub is too loose to provide the needed support. As a result the pulley hub bearing wears pretty quickly and does allow the pulley to "wobble"...you most likely can rock the pulley some. You should not be able to pull the pulley in/out.

You can get aftermarket (Chinese) bearings from the local auto parts or industrial supplier for about $ 8.00, and fitting a new bearing is a good idea if you have a lot of movement.

Another "fix" is to get some rubber carpet runner or floor mat, and cut some rubber spacers to fit between the pulley hub and rubber snubbers to tighten up the play.

http://i41.tinypic.com/2wgf1mo.jpg

The ultimate fix is to find a machinist friend to machine the pulley hub to have a bushing that fits snugly into the wheel hub.

http://i60.tinypic.com/350jwr6.jpg
http://i60.tinypic.com/29axgzt.jpg

Title: Re: movement of driven pulley normal?
Post by rijopiatt on 03/13/15 at 04:28:49

It doesn't move in and out, just rocks. Do you think 1/32" is too much movement?

Rick

Title: Re: movement of driven pulley normal?
Post by Dave on 03/13/15 at 04:35:27

There are a lot of these bikes running around with far more play than that.

I would suggest you do the rubber floor mat mod when you can fit it into your schedule.

Title: Re: movement of driven pulley normal?
Post by Gary_in_NJ on 03/13/15 at 05:13:27

It's normal for the design of the hub.

Dave, good suggestion, I haven't come across that before.

Title: Re: movement of driven pulley normal?
Post by justin_o_guy2 on 03/13/15 at 06:03:41

Ride it. Check it before you drop the wheel to put a tire on.
If you replace the tube you can use the old one to cut shims from..
Some wobble is just Gonna be there.. it's not a problem..

Title: Re: movement of driven pulley normal?
Post by rijopiatt on 03/13/15 at 07:08:07

Thanks for all the ideas. I'll put rubber shims in the next time I need to remove the wheel and consider having the machining done next winter when the winter is sucky.