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Old 12-06-10, 01:22 PM   #1
globalrider
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Is extending a rear axle possible?

I'd like to install a Sturmey Archer 2 speed kickback hub on a OCC Schwinn Stingray frame. The rear dropouts are so wide the hub would just fit between them leaving no axle in the dropouts much less enough to bolt the hub into place. Could a nipple and axle be safely welded on to extend the length on the axle? Any suggestions/ideas would be appreciated. Thanks
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Old 12-06-10, 01:27 PM   #2
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Quote:
Originally Posted by globalrider View Post
The rear dropouts are so wide the hub would just fit between them leaving no axle in the dropouts much less enough to bolt the hub into place. Could a nipple and axle be safely welded on to extend the length on the axle? Any suggestions/ideas would be appreciated. Thanks
In your place, I would look at respacing the dropouts
to fit the hub versus your proposed axle extension.
Even if you could weld it on there straight (problematic
at best) on an axle it would be forever after suspect
in terms of safety. I don't know the hub, so I don't
know whether a longer axle might be swappable--
but I suspect not.

If I am misreading your post and it is the actual
physical dimensional width of each individual dropout
that is the problem, I got nothin' for you.

Mike
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Old 12-06-10, 01:39 PM   #3
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Seek out a dealer to order from Sturmey Archer parts distributors a longer axle,
and then Overhaul the hub to install it.

I am more familiar with their 3 speed Hubs than the 2 speed Kickback shift hub.

AW3 has several axle length options, It also has the 'Sun Gear' attached to the center of it.
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Old 12-06-10, 01:45 PM   #4
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Older road bikes are often "cold set", or bent under a good degree of control, to wider dropout openings to allow fitting newer and wider rear wheels into old frames. I'd suggest you do the opposite and close in the Stingray frame to allow installing the wheel without a longer axle.

Is welding possible? Yes, but the axle would need to be re-heat treated after. And you would need to really trust the welder to do a really good job. It isn't worth the cost. I'm not familiar with that hub so I don't know if it's just a regular style of axle or if some of the internal mechanism is part of the axle. If it is then I guess that's why you're asking about welding. But I truly wouldn't and would suggest against it due to the need to re-heat treat the whole axle after the welding. It just isn't worth it when it's much easier to adjsut the frame.
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Old 12-06-10, 02:36 PM   #5
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Older road bikes are often "cold set", or bent under a good degree of control, to wider dropout openings to allow fitting newer and wider rear wheels into old frames. I'd suggest you do the opposite and close in the Stingray frame to allow installing the wheel without a longer axle.
That's what I did to fit a 3-speed hub to my MTB frame. Mine only had a 6-speed freewheel to start with, so minimal bending was necessary, but you can quite safely bend a steel frame slightly to fit the hub. Just make sure both sides are bent equally or the wheel will be offset.
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Old 12-07-10, 12:30 AM   #6
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Quote:
Originally Posted by globalrider View Post
I'd like to install a Sturmey Archer 2 speed kickback hub on a OCC Schwinn Stingray frame. The rear dropouts are so wide the hub would just fit between them leaving no axle in the dropouts much less enough to bolt the hub into place. Could a nipple and axle be safely welded on to extend the length on the axle? Any suggestions/ideas would be appreciated. Thanks
Probably not going to happen. The OCC Stingray has a very wide over-locknut dimension, something like 175mm, in order to work around the 4" wide rear tire. You can't respace the frame without making it impossible to install the wheel. Extending the axle might be possible, but it's going to take some special machine work. IIRC, the thread on the Sturmey axle is 10.5mm x 26tpi. You're not going to find taps that size easily.
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Old 12-07-10, 05:15 AM   #7
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I don't want to hijack the thread but I'm just asking out of sheer morbid curiosity. If anyone wanted to build wheels with Shimano HF08 tandem hubs which are 145mm, is it really possible to respace them to 135mm? I thought I read something like that and I can't find the information.
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Old 12-07-10, 08:34 AM   #8
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If it's a lot of difference that might actually be an advantage, it opens up the possibility to make axle extenders as some of you might remember from the early days of skate boarding. Basically cone shaped thingys that fitted like axle nuts at the thicker end and were shaped like axle stubs at the narrow end. If it was me I'd take a S-A axle nut, grind it round and stick it into a short length of thick-walled tubing. Then I'd take a bolt, grind the head of that one round too, and stick the head into the other end of the short stump of tubing. Then I'd braze/weld the three parts together and I'd have my axle extender done. Old axle goes into the axle nut, bolt goes into drop out.
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