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Wobble in hubs
We were building up bikes today at the shop and the freewheel part of the
wheel I was working on has a pretty serious wobble to it when the wheel was just freewheeling. It was on a Giant Sedona. It turned out that it was because the freewheel wasn't tightened down first, but every single freewheel that I've seen had some wobble to it, whether it be slight or not. I can't remember if freehubs do it too, but I think they do. My coworker said that someone else said it was to enhance shifting. It makes sense, but then it would also tend to make it shift worse, since it'd be more apt to jump out of gear. And this was the case. Since that coworker didn't tighten down the freewheel, I pedaled it out for a test ride, and not going anywhere, I knew the freewheel had tightened. Shifting was fine after that. My question is, is the wobble due to poor manufacturing tolerances? -- Phil, Squid-in-Training |
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#2
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In article ,
"ZeeExSixAre" wrote: We were building up bikes today at the shop and the freewheel part of the wheel I was working on has a pretty serious wobble to it when the wheel was just freewheeling. It was on a Giant Sedona. It turned out that it was because the freewheel wasn't tightened down first, but every single freewheel that I've seen had some wobble to it, whether it be slight or not. I can't remember if freehubs do it too, but I think they do. My coworker said that someone else said it was to enhance shifting. It makes sense, but then it would also tend to make it shift worse, since it'd be more apt to jump out of gear. And this was the case. Since that coworker didn't tighten down the freewheel, I pedaled it out for a test ride, and not going anywhere, I knew the freewheel had tightened. Shifting was fine after that. My question is, is the wobble due to poor manufacturing tolerances? Yes, it is. But before someone pounces on me, the wobble is of no practical significance. That "explanation" about enhancing shifting is, as the Brits say, ********. |
#3
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In article ,
"ZeeExSixAre" wrote: We were building up bikes today at the shop and the freewheel part of the wheel I was working on has a pretty serious wobble to it when the wheel was just freewheeling. It was on a Giant Sedona. It turned out that it was because the freewheel wasn't tightened down first, but every single freewheel that I've seen had some wobble to it, whether it be slight or not. I can't remember if freehubs do it too, but I think they do. My coworker said that someone else said it was to enhance shifting. It makes sense, but then it would also tend to make it shift worse, since it'd be more apt to jump out of gear. And this was the case. Since that coworker didn't tighten down the freewheel, I pedaled it out for a test ride, and not going anywhere, I knew the freewheel had tightened. Shifting was fine after that. My question is, is the wobble due to poor manufacturing tolerances? Yes, it is. But before someone pounces on me, the wobble is of no practical significance. That "explanation" about enhancing shifting is, as the Brits say, ********. |
#4
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ZeeExSixAre wrote:
We were building up bikes today at the shop and the freewheel part of the wheel I was working on has a pretty serious wobble to it when the wheel was just freewheeling. It was on a Giant Sedona. It turned out that it was because the freewheel wasn't tightened down first, but every single freewheel that I've seen had some wobble to it, whether it be slight or not. I can't remember if freehubs do it too, but I think they do. My coworker said that someone else said it was to enhance shifting. It makes sense, but then it would also tend to make it shift worse, since it'd be more apt to jump out of gear. And this was the case. Since that coworker didn't tighten down the freewheel, I pedaled it out for a test ride, and not going anywhere, I knew the freewheel had tightened. Shifting was fine after that. My question is, is the wobble due to poor manufacturing tolerances? Yes. Most freehubs, and freewheels wobble. There is lots of slack in most of their bearings. They generally use shims to adjust bearing clearance rather than cups and cones, which is really crude. However, as the bearings only do anything when you're freewheeling and they carry virtually no load, it's no big deal. |
#5
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ZeeExSixAre wrote:
We were building up bikes today at the shop and the freewheel part of the wheel I was working on has a pretty serious wobble to it when the wheel was just freewheeling. It was on a Giant Sedona. It turned out that it was because the freewheel wasn't tightened down first, but every single freewheel that I've seen had some wobble to it, whether it be slight or not. I can't remember if freehubs do it too, but I think they do. My coworker said that someone else said it was to enhance shifting. It makes sense, but then it would also tend to make it shift worse, since it'd be more apt to jump out of gear. And this was the case. Since that coworker didn't tighten down the freewheel, I pedaled it out for a test ride, and not going anywhere, I knew the freewheel had tightened. Shifting was fine after that. My question is, is the wobble due to poor manufacturing tolerances? Yes. Most freehubs, and freewheels wobble. There is lots of slack in most of their bearings. They generally use shims to adjust bearing clearance rather than cups and cones, which is really crude. However, as the bearings only do anything when you're freewheeling and they carry virtually no load, it's no big deal. |
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