Jockey wheel alignment
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Jockey wheel alignment
After cycling behind me today, James mentioned that it looked like my chain was rubbing the side of my derailleur cage. On close inspection, it looks like the jockey wheel is running off-centre. Any ideas why this might be? I'm wondering of the derailleur is out of line, or if it's a problem with the jockey wheel itself.
I tried to take a photo (not very successfully, but hopefully you can see what I mean).
I tried to take a photo (not very successfully, but hopefully you can see what I mean).
- Philip Whiteman
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- chris ankcorn
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The cage looked fine. Its more likeley to be the jockey wheel bearings.George wrote:My guess: either the cage is bent (and the jockey wheel is being pulled to the side in consequence) or the jockey wheel's bearing has disintegrated.
All the jockey wheels I've pulled apart have plane bearings with a stainless steel lining/tube. I'm wondering whether it was assembled without this??
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There should be play in the top jockey wheel, but not in the other one. This is so that the jockey wheel can shift the chain from one sprocket to the next, hence why you need this lateral movement.laurence_cooley wrote:There's quite a lot of lateral play in that one, which I presume there isn't supposed to me. I took it apart, cleaned it and reassembled but it's still possible to wobble it a lot by hand, so I think it needs replacing.
A point to note that most if not all after market jockey wheels do not allow for. Which is why I tend to purchase genuine Shimano ones to get the best shifting action.
THIS might help you?
"You only need two tools: WD40 and duct tape. If it doesn't move and it should, use WD40. If it moves and it shouldn't, use duct tape"
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Laurence, what I was suggesting was that it might be bent relative to the parallelogram. The side plates that reach down from the parallelogram may be straight, but the angle of those side plates relative to the parallelogram looks odd to me, as if maybe at some time it had received an inward bash from the side (e.g. in a fall). But, in all honestly, I'm not really sure; I'm just speculating.
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I see Hope now manufacture Jockey wheels that have roller bearings, does anyone have experience of these?
If anything like other things Hope, they will be the canine's whatsits
http://www.hopetech.com/page.aspx?itemi ... escription
They (non Hope ones) are relatively inexpensive so I always renew jockey wheels when changing cassette, chain ring and chain.
If anything like other things Hope, they will be the canine's whatsits
http://www.hopetech.com/page.aspx?itemi ... escription
They (non Hope ones) are relatively inexpensive so I always renew jockey wheels when changing cassette, chain ring and chain.
Laurence,Pedlo Mudguardo wrote:It would seem that the jockey wheels are keeping the correct line but the cage certainly isn't .
Just as a matter of interest, is there any play on the actual mounting bolt where the rear mech attaches to the frame? Because as Nic says, it seems from the photo that the jockey wheels are taking up the bad alignment of the cage.
"You only need two tools: WD40 and duct tape. If it doesn't move and it should, use WD40. If it moves and it shouldn't, use duct tape"
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