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Thread-on freewheel questions
"Luigi de Guzman" wrote:
1) Are all thread-on freewheels the same, or are there differences--threading, etc--that would make some not work on some hubs? The most common threading is BSC/ISO - 1.37" x 24tpi. Italian threads were 35mm x 1mm pitch, and French were something odd like 34.5mm x 1mm. You can use a British freewheel on an Italian hub (if you can get it on), but otherwise you shouldn't mix and match. You'd be unlucky to end up with anything other than BSC. 2) The old Raleigh has 126mm rear dropout spacing, and the original wheel had a Helicomatic hub, taking 6 sprockets. Am I right in assuming that I would be able to use a 7-speed freewheel on the new wheel? In principle, yes. It depends on the arrangement of spacers on either side of the hub. 3) Are wheels that take 6-speed freewheels different, really, from wheels meant for 7-speed freewheels--as in dish, etc? If I use a 6 in a wheel built for a 7, would I need to re-dish the wheel? Some 7-speed clusters are slightly broader than some 6-speed clusters, so a 7-speed freewheel threaded onto a hub intended for a 6-speed may come uncomfortably close to right dropout. In that case you need to transfer washers or spacers from the left of the axle to the right, and ideally dish the wheel right to make up the difference. All that aside, if it's one of these: http://bulgier.net/pics/bike/catalog...4/ral84_06.jpg the rear end may be slightly narrower - mine was 122mm, as I think I mentioned once before. James Thomson |
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Thread-on freewheel questions
I put a 7-speed freewheel on my ex-wife's real wheel that came off a Raleigh
Record (5-speed) and had no problems at all. The only real difference between different freewheels that I can see is which puller they take (old Schwinn, Shimano, Sunigo, whatever). I recently added the above mentioned real wheel to an old Schwinn Varsity. Runs like a Swiss watch. |
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Thread-on freewheel questions
On Mon, 21 Jul 2003 19:37:40 +0000, Luigi de Guzman wrote:
1) Are all thread-on freewheels the same, or are there differences--threading, etc--that would make some not work on some hubs? Except for old French freewheels, they are all the same. Anything you can find now will work. 2) The old Raleigh has 126mm rear dropout spacing, and the original wheel had a Helicomatic hub, taking 6 sprockets. Am I right in assuming that I would be able to use a 7-speed freewheel on the new wheel? Probably, but you will want a bit more spread. Most 7-speed stuff (not all) is 130mm, but that is not so much of a spread and you can just skooch the wheel in there. 3) Are wheels that take 6-speed freewheels different, really, from wheels meant for 7-speed freewheels--as in dish, etc? If I use a 6 in a wheel built for a 7, would I need to re-dish the wheel? Yes, the dish would be different, since most 7-speed freewheels take more space in the direction of the axle. Re-dishing is not too bad to do, as long as the spokes and nipples are in good shape. -- David L. Johnson __o | A foolish consistency is the hobgoblin of little minds, adored _`\(,_ | by little statesmen and philosophers and divines. --Ralph Waldo (_)/ (_) | Emerson |
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