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crank arm distroyed

Old 09-15-11, 07:09 PM
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Jaymz
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crank arm distroyed

Hi everyone. I'm glad I found this great forum for bike owners

I bought this cheap Huffy bike with $140 last month and after only 2-3 weeks the spindle damaged the crank arm on the left hand side

I downloaded a 74-page manual and also looked at the printed manual but there are no detailed specs as to what exact crank arm dimensions to look for, to replace the broken one. Can anyone please help me with a starting point/advice ? Thanks a lot.
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Old 09-15-11, 07:22 PM
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fietsbob 
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A Huffy ?
seriously Not enough info .. [that website wont load pictures, on my computer]

If you have not learned Bicycle parts vernacular to use commonly agreed upon terms.
so as to ask understood questions,
you may have to take pictures of what you have, and what you broke .

Q1: Is it a 1 piece crankarm and half inch type pedal ? steel

or a 3 piece with crank arms of aluminum. that would have a 9/16" type pedal.

one problem Department stores don't repair bikes they sell,
and its not uncommon for Bike shops
to pass on a repair of big box chain store bikes ..

Last edited by fietsbob; 09-15-11 at 07:31 PM.
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Old 09-15-11, 07:27 PM
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For the money it may take you to find another crank arm you could find a nice old (non-huffy) road bike at a garage sale or online somewhere.
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Old 09-15-11, 07:30 PM
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I thought you folks would take a look at that link. It has a nice magnifying lens and you would have seen it's a 3-piece

It's not a total crap. I replaced the seat and I knew from reviews that the pedals will come off first, so I was kind of expecting this. Thanks all.
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Old 09-15-11, 07:34 PM
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You have to buy some bike specific tools , a look at the Park Bike tools company website
has a number of how-to topics on Bike repair in general , there.
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Old 09-15-11, 07:49 PM
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Originally Posted by fietsbob View Post
you have not learned Bicycle parts vernacular to use commonly agreed upon terms.
ok, now that I've seen the repair website you mentioned, I can re-phrase with proper terminology:
the pedal damaged the threads on the crank arm

so I would look for any crank arm that accepts 9/16" type pedals ?
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Old 09-15-11, 09:08 PM
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Probably you need a new crank entirely. Possibly a shop may be able to "chase" the threads, but likely it will just fail again.

You're right, your bicycle is not "total" crap. When ridden gently enough and with enough $ invested as things break at inconvenient times, it will remain rideable for a couple years probably. But it's frustrating to do that. If you get in the habit of riding lots (and we very much hope you do), this sort of machine just will not do. How in the world do you get a bicycle with dual suspension and disc breaks to retail for $140 and still cover the cost of production, shipping 6000 miles from China, and still provide a nice profit to the retailer??? Only with effortful, vigilant, aggressive compromise and using the absolute worst components available. And then assembling them automatically whenever possible, with no quality control oversight at all.
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Old 09-15-11, 09:18 PM
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that's a very good point about the quality. I am not a daily rider but more like a once-a-week rider and that was the main reason I chose this bike. of course I would have preferred a $500+ bike but I could not invest that much, at least not now.

so you folks recommend buying a whole new crank set ? any recommendations for a cheap but (lol) still a good one ?
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Old 09-15-11, 09:28 PM
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Take the pedal and the crank arm to a machine shop in your town, not a bike shop. If it's possible, they will have the tools and know how to repair the threads.

Good Luck,
Eric
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Old 09-16-11, 03:57 AM
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If you have a local bike shop, then give them a shot at getting you a new crank arm or fixing yours. If the pedals on the bike are not expensive you might try screwing the pedal back into the crank arm along with a good coating of JB weld as a thread lock and see if it will hold.
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Old 09-16-11, 06:51 PM
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Originally Posted by eric1514 View Post
Take the pedal and the crank arm to a machine shop in your town, not a bike shop. If it's possible, they will have the tools and know how to repair the threads.

Good Luck,
Eric
This is worth a shot, but I doubt they will be able to help unless they also happen to have a bike geek that works there. The threading of the pedal axle and the pedal hole in the crank is 9/16" x 20tpi, not a very common threading outside of the bicycle world. I would definitely suggest taking your bike to a bike shop and telling them exactly what you need done, that is, you need the pedal threads chased on your cranks. If they refuse to help you or try to sell you something, leave and find another shop. Once you have the threads chased, have the shop grease the threads and re-install the pedals so you don't have any more issues.

Oh yeah, don't let people give you flak for your choice of bike. You could have chosen something a lot worse and even less suited to your current needs. I applaud you for taking the time to look into repair rather than settling in as just another American consumer. Good luck!

Cheers
lverhagen
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