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6 speed freewheel on 7 speed threaded hub?

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6 speed freewheel on 7 speed threaded hub?

Old 11-25-17, 08:42 AM
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robertmccormack
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6 speed freewheel on 7 speed threaded hub?

Can anyone tell me-- can I fit a 6 speed freewheel on 7 speed threaded hub?
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Old 11-25-17, 08:49 AM
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Yes. No problem at all. I assume you do not have indexed shifters. You will need to adjust the limit screws on your rear derailleur.
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Old 11-25-17, 09:22 AM
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If you do have the indexed shifters that Slash referred to...they might be able to be switched between index and friction function. Look on the side of the shift level for the rear derailleur. If so...I think you'll be much happier using them in friction mode when the shift index/gear count don't match. (Edited to add...I guess it's the screw slot and not the thumb nut bail that indicates the setting...because that bike is most definately using SIS and not friction.)

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Old 11-25-17, 10:12 AM
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the hub thread does not have Any "Speeds"..
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Old 11-25-17, 10:56 AM
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Originally Posted by _ForceD_ View Post
I guess it's the screw slot and not the thumb nut bail that indicates the setting...because that bike is most definately using SIS and not friction.
No, the slotted bolt head is to install the levers on the boss; the D-ring selects between SIS and indexed modes, and is intended to be able to switch modes while riding. Shimano designed it this way because during testing, some of the racers expressed concern that the audible "click" when shifting would warn their competition that they were shifting gears and may be attacking. But there is a range of indexing available between full-SIS and full-friction shifting. As the D-ring approaches the "Friction" setting, the indexing becomes softer and softer before finally disappearing at the "friction" end of the range.
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Old 11-25-17, 11:00 AM
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Originally Posted by fietsbob View Post
the hub thread does not have Any "Speeds"..
Yes, the only difference between 5, 6, and 7 speed freewheel hubs is the length of the axle on the drive side. The overall length may also increase, particularly on more modern hubs, but with a traditional 126mm OLD, one could accommodate 5, 6, or 7 cog freewheels simply be re-arranging the spacers on the axle and re-dishing the wheel.
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Old 11-25-17, 11:15 AM
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yes, and I have changed the axle spacers the other way , centered the hub,

and put a single speed freewheel on a '5 speed' wheel

and re dished the spoke tensions.
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Old 11-25-17, 11:19 AM
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Originally Posted by JohnDThompson View Post
No, the slotted bolt head is to install the levers on the boss; the D-ring selects between SIS and indexed modes, and is intended to be able to switch modes while riding. Shimano designed it this way because during testing, some of the racers expressed concern that the audible "click" when shifting would warn their competition that they were shifting gears and may be attacking. But there is a range of indexing available between full-SIS and full-friction shifting. As the D-ring approaches the "Friction" setting, the indexing becomes softer and softer before finally disappearing at the "friction" end of the range.
You are correct. At first I thought something was askew with my shifter because I am most definately using it in the indexing mode. But I just looked again. On the shifter pictured above, there is a small indicator arrow on the chrome collar that is 90 degrees off from the D-ring and is pointing to the SIS...it's not visible in the above pic.

Dan
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Old 11-26-17, 02:58 AM
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Thanks a lot, everyone!
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