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Old 04-28-06, 07:29 AM   #1
Viggen Ed
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Chronic Chain loss - Ribs starting to Hurt!

Well, I finally got the bike I've been drooling over for years, an Electra Rat Rod with 3 speed and coaster brake. (Hey, everybody's god different dreams, OK? ) I have a bunch of bicycle experience from adjusting deraileurs on old 10 speeds, building bmx'ers, etc, as a kid, but wanted something that I'd never have to pick up a wrench so the nexus hub seemed appealing.

Unfortunately, my Rat Rod has been more trouble than many of my junkyard bikes. The bike shop built it, but I was not impressed with the build from the start. Everything seems loose, but the most crucial thing was teh rear wheel. When I stand up to really accelerate, which is something I enjoy, the wheel gets pulled forward in its horizontal drop out and the chain falls off.... Ouch! So I tensioned the chain myself, and tightened the rear wheel down pretty good, but was afraid that the hollow axle of the electra hub would be weaker than a regular bmxer. The other day, it came off again!

So my questions are:
Do I have to worry about bending/stripping the axle of the electra hub any more than I do a regular hub, considering that the shifting rod passes through the axle?
If I have to be gentle, is there any way to get the right tightness without buying a torque wrench?
Or do I just have to stop standing up and pedalling my brand new, supposedly indestructible cruiser bike? This spring, I would estimate my weight at 250 pounds, with a decent gut, but some fairly strong legs from carrying all this weight up and down my many stairs. Is this just too much force for that little axle nut? I guess if that's the case, I'll be half proud and half disappointed
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Old 04-28-06, 07:58 AM   #2
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You could just set the wheel forward in the dropouts and get a chain tensioner or see if you can adjust the chain to where it wont drop off when set forward in hte drop outs
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Old 04-28-06, 08:09 AM   #3
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I think what you need is anti-rotation washers.


Last edited by highlyselassie; 04-28-06 at 08:17 AM.
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Old 04-28-06, 08:54 AM   #4
Viggen Ed
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Thanks guys! Interesting replies. I wonder if a chain tensioner would make my coaster brake require extra back-pedaling to work though? It'd be kinda like a chain tensioner on a fixie.. And the wheel might still move further forward when I pedal too hard...

The anti-rotation washer seems interesting... Those teeth on the inside of the washer look like they would bite right into the dropout to help resist forward motion. I would be a bit worried about it marring my beautiful flat-black paint, but I guess it's not a place where people will really see that anyways..

Any further suggestions are welcome! This physics problem may have more solutions yet..
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Old 04-28-06, 09:00 AM   #5
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I think by chain tensioner he meant chain tugs, like some track or BMX bikes use to pull the axle back before you snug the bolts up. Only works with rear-facing dropouts of certain designs.

And yeah, you can tighten the bolts down hard on a hollow axle without fear. Hollowness doesn't make the threads weaker. That may solve your problem. You might try more aggressive washers like those above, or track nuts (nuts with integral free-spinning serrated washers)
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Old 04-28-06, 09:44 AM   #6
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Yep, I agree to try a chain tug. Looks something like this, and your LBS should have 'em:

Try one on the drive side first, though you may find you need one on the non-drive side also. They shouldn't cost much. $10 each or so.
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Old 04-28-06, 11:20 AM   #7
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Quote:
Originally Posted by highlyselassie
I think what you need is anti-rotation washers.

A Nexus hub should have anti-rotational washers as part of it's originally installed components.
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