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Nexus 7-speed problem
I recently put a Shimano Nexus 7-speed hub on an old bike I'm using for a winter commuter, and am having trouble with it. It seems to have a tendency for the shifter cable mechanism next to the sprocket to rotate (opposite to the wheel rotation), which then ruins the cable adjustment and I then have lost gears and uneven operation. I have to remove the wheel and rotate it back into place, then re-adjust the cable. It's on the fritz now after one moderately energetic ride of only 5-10 miles. I am not using the roller brake, and it has been removed. The little hook-end washer is still engaged; it doesn't rotate, so I assume that the axle doesn't rotate. The nuts are quite tight. The frame is an old Italian road bike with horizontal dropouts. Anyone else have this problem, or a suggested fix? I'm on the verge of ripping it out and converting the bike to either a fixed gear or single-speed. -- David L. Johnson __o | What is objectionable, and what is dangerous about extremists is _`\(,_ | not that they are extreme, but that they are intolerant. (_)/ (_) | --Robert F. Kennedy |
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#2
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Nexus 7-speed problem
"David L. Johnson" wrote:
I recently put a Shimano Nexus 7-speed hub on an old bike I'm using for a winter commuter, and am having trouble with it. It seems to have a tendency for the shifter cable mechanism next to the sprocket to rotate (opposite to the wheel rotation), which then ruins the cable adjustment and I then have lost gears and uneven operation. I have to remove the wheel and rotate it back into place, there should be a special ring to lock it in place then re-adjust the cable. ? It shouldn't affect adjustment, if the outer doesn't get shorter and the cableclamp doesn't slip It's on the fritz now after one moderately energetic ride of only 5-10 miles. I am not using the roller brake, and it has been removed. The little hook-end washer is still engaged; it doesn't rotate, so I assume that the axle doesn't rotate. Why the singular: there should be two, one on each side to support the axle! The nuts are quite tight. The frame is an old Italian road bike with horizontal dropouts. Anyone else have this problem, or a suggested fix? I'm on the verge of ripping it out and converting the bike to either a fixed gear always a good idea or single-speed. -- --- Marten Gerritsen INFOapestaartjeM-GINEERINGpuntNL www.m-gineering.nl |
#3
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Nexus 7-speed problem
It does sound like the axle is rotating, but if you're absolutely
certain that it's not, the only thing I can think of is to make absolutely sure that the cable is routed properly from the cable stop to the hub. From what I remember, it's possible to get it "in the wrong notch" and have it do funny stuff. Been a while since I messed with one, so can't be more specific. Do you have documentation for it? I'd study the diagram and make sure of the routing. Sounds silly, but it's made me scratch my head before. I miss my Nexus bike dearly and had zero problems with it. Short of adjusting the cable for stretch every few months--you shouldn't have to think about it. Hope you got the nice 7spd thumb shifter for it, as it's much nicer than the grip (echh) shifter that the 8spd has. |
#4
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Nexus 7-speed problem
On Fri, 11 Nov 2005 22:01:00 +0100, m-gineering wrote:
"David L. Johnson" wrote: I recently put a Shimano Nexus 7-speed hub on an old bike I'm using for a winter commuter, and am having trouble with it. It seems to have a tendency for the shifter cable mechanism next to the sprocket to rotate (opposite to the wheel rotation), which then ruins the cable adjustment and I then have lost gears and uneven operation. I have to remove the wheel and rotate it back into place, there should be a special ring to lock it in place Locked in place. The whole assembly is rotating. It's on the fritz now after one moderately energetic ride of only 5-10 miles. I am not using the roller brake, and it has been removed. The little hook-end washer is still engaged; it doesn't rotate, so I assume that the axle doesn't rotate. Why the singular: there should be two, one on each side to support the axle! Mine only had one. The left side was a standard lock-washer. -- David L. Johnson __o | Accept risk. Accept responsibility. Put a lawyer out of _`\(,_ | business. (_)/ (_) | |
#5
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Nexus 7-speed problem
On Fri, 11 Nov 2005 13:39:05 -0800, maxo wrote:
It does sound like the axle is rotating, but if you're absolutely certain that it's not, the only thing I can think of is to make absolutely sure that the cable is routed properly from the cable stop to the hub. From what I remember, it's possible to get it "in the wrong notch" and have it do funny stuff. Been a while since I messed with one, so can't be more specific. Do you have documentation for it? No. Got it at a swap meet,. though it was new. I'd study the diagram and make sure of the routing. Sounds silly, but it's made me scratch my head before. will check that out. I miss my Nexus bike dearly and had zero problems with it. Short of adjusting the cable for stretch every few months--you shouldn't have to think about it. Hmm, not my experience so far. Hope you got the nice 7spd thumb shifter for it, as it's much nicer than the grip (echh) shifter that the 8spd has. Yes, I have the thumb shifter. -- David L. Johnson __o | A mathematician is a machine for turning coffee into theorems. _`\(,_ | -- Paul Erdos (_)/ (_) | |
#6
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Nexus 7-speed problem
"David L. Johnson" wrote in message news I recently put a Shimano Nexus 7-speed hub on an old bike I'm using for a winter commuter, and am having trouble with it. It seems to have a tendency for the shifter cable mechanism next to the sprocket to rotate (opposite to the wheel rotation), which then ruins the cable adjustment and I then have lost gears and uneven operation. I have to remove the wheel and rotate it back into place, then re-adjust the cable. It's on the fritz now after one moderately energetic ride of only 5-10 miles. I am not using the roller brake, and it has been removed. The little hook-end washer is still engaged; it doesn't rotate, so I assume that the axle doesn't rotate. The nuts are quite tight. The frame is an old Italian road bike with horizontal dropouts. Anyone else have this problem, or a suggested fix? I'm on the verge of ripping it out and converting the bike to either a fixed gear or single-speed. -- David L. Johnson I have a nexus 7sp hub with a back peddle brake . The hub has a reaction arm to stop it rotating . I assume the roller brake has this arm so if you refit the brake and use this arm the hub canot rotate . It's a while since I had a look at my hub so I can't understand why yours is rotating without the roller brake but refitting the brake assembly is worth a try. PK __o | What is objectionable, and what is dangerous about extremists is _`\(,_ | not that they are extreme, but that they are intolerant. (_)/ (_) | --Robert F. Kennedy |
#7
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Nexus 7-speed problem
"David L. Johnson" wrote:
On Fri, 11 Nov 2005 22:01:00 +0100, m-gineering wrote: "David L. Johnson" wrote: I recently put a Shimano Nexus 7-speed hub on an old bike I'm using for a winter commuter, and am having trouble with it. It seems to have a tendency for the shifter cable mechanism next to the sprocket to rotate (opposite to the wheel rotation), which then ruins the cable adjustment and I then have lost gears and uneven operation. I have to remove the wheel and rotate it back into place, there should be a special ring to lock it in place Locked in place. The whole assembly is rotating. It's on the fritz now after one moderately energetic ride of only 5-10 miles. I am not using the roller brake, and it has been removed. The little hook-end washer is still engaged; it doesn't rotate, so I assume that the axle doesn't rotate. Why the singular: there should be two, one on each side to support the axle! Mine only had one. The left side was a standard lock-washer. Sorry, my bad: 8's have 2, 4's have two, but 7 makes do with one. Is the rh locknut on the axle tight? -- --- Marten Gerritsen INFOapestaartjeM-GINEERINGpuntNL www.m-gineering.nl |
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