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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 05-28-08, 08:56 AM   #1
nextstopwillbe
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Shimano Nexus Inter-8 Help?

I got a flat on my Jamis Commuter 3.0 a couple of weeks so I had to remove the rear wheel for the first time. It has a Shimano Nexus Inter-8 on it which I had no experience with. After repairing the flat, I got it all back together and it's shifting and riding fine but there's one little problem. The cassette joint bracket is not staying in place. I line it up parallel to the chainstay then snug up the cap nut but it creeps upward after riding it a bit.

I suspect that I either don't have the non-turn washer lined up right or maybe the cassette joint fixing ring is not locked properly. Can anyone shed some light on this? Here's a link to the service pdf in case that helps.
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Old 05-29-08, 10:15 PM   #2
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Make sure you have the right non-turn washer on each side, as they are side-specific. Are the red marks aligned on the cassette joint cap?
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Old 06-03-08, 08:14 PM   #3
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the red marks are aligned. i think the problem is with the stock non-turn washers, they're identical for starters and the tabs on them do not extend all the way through the frame. shouldn't they be engaging something on the hub?
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Old 06-03-08, 08:54 PM   #4
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I can't find a good detail shot of the Jamis dropouts. So I'm just guessing here. On mine (non turn washers, yellow-right,brown-left) the cassette joint bracket doesn't line up parallel to the chain stay. I check another's with vertical dropouts (blue-right,green-left) and that cassette joint bracket points up maybe about 20 degrees.

I slightly remember when washing my bike a year or so ago that bracket disconnected when I was wiping it with a cloth. I can't remember which, but one direction loosens it and the other secures it in place. I wonder if you try to align it parallel to the chain stay, that loosens the whole bracket. But I can't tell for sure because the alignment is going to be a little different for each type of drop out and I can't figure out what the Jamis has.
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Old 06-04-08, 07:53 PM   #5
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the dropouts are horizontal, similar to track ends. my suspicion is the jamis stock non-turns are the problem. they're not shimano parts and actually i don't think they're non-turn. the hole in the washer is perfectly round and therefore not keyed to the axle shaft so how could they be non-turn? i ordered the proper shimano parts from harris cyclery so hopefully they'll solve the problem. thanks for the suggestions.
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Old 06-06-08, 02:17 PM   #6
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Keep us updated as to the results.
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Old 06-09-08, 01:44 PM   #7
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the shimano parts did the trick although they position the cassette joint bracket behind the chainstay making it a little hard to get to. no big deal but worth mentioning. the only other anomaly is the built-in chain tensioners are too short now. the stock jamis washers were a bit longer than the shimano ones. i assume i could remove a chain link, maybe, and it would solve the problem but i don't think it's a concern. i hope this makes sense, i can take pics if it would help.
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