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Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

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Old 07-14-14, 09:39 PM   #1
mijohnst
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Cross threaded left crank arm

I just bought a used Pinarello bike that's in great shape. The only issue is that when I went to put the left peddle on, I can see that it has been cross threaded so my left peddle won't go on. I think the person I bought it from should have to pay for it but I'm trying to make it easy for him because I'm a nice guy like that.

I'm looking for just the left crank arm, but I can't seem to find one anywhere close or cheap. The crank set is an FC-R563/FC-R565. In my searching I'm finding that it might be cheaper just to buy a whole new crank like the FC-5750. All this is Greek to me so I'm hoping someone knowledgeable can guide me. Would buying the FC-5750 crank mean I need to change out my back wheel cogs as well or is it a strait replacement? Should I stick with my search for for a FC-R653 and where would I go to find one?

Any help will be much appreciated.
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Old 07-14-14, 10:07 PM   #2
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Originally Posted by mijohnst View Post
I just bought a used Pinarello bike that's in great shape. The only issue is that when I went to put the left peddle on, I can see that it has been cross threaded so my left peddle won't go on. I think the person I bought it from should have to pay for it but I'm trying to make it easy for him because I'm a nice guy like that.

I'm looking for just the left crank arm, but I can't seem to find one anywhere close or cheap. The crank set is an FC-R563/FC-R565. In my searching I'm finding that it might be cheaper just to buy a whole new crank like the FC-5750. All this is Greek to me so I'm hoping someone knowledgeable can guide me. Would buying the FC-5750 crank mean I need to change out my back wheel cogs as well or is it a strait replacement? Should I stick with my search for for a FC-R653 and where would I go to find one?

Any help will be much appreciated.
IF it is a 565 then a 5750 would work. But I would spend the extra cash and get a 6750.
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Old 07-14-14, 10:57 PM   #3
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Thanks for your input fstshrk. I'm going to look into that since I'm going to be buying one anyway. Can you tell me why it would be better? Better metal or something?
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Old 07-14-14, 11:07 PM   #4
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Maybe the thread can be chased (restored). Ask a bike mechanic before replacing the crankset.
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Old 07-15-14, 12:22 AM   #5
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can we assume you tightening the left pedal anti-clockwise
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Old 07-15-14, 04:43 AM   #6
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Park Tool Co. » ParkTool Blog » Pedal Bushing Repair Kit Procedure

Call around to LBS and maybe it can be repaired
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Old 07-15-14, 06:10 AM   #7
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First, have someone else verify there's a problem.
Picture ?
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Old 07-15-14, 06:36 AM   #8
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It's possible that only the first few threads of the crank arm are damaged and the fix may be easier than you think. Try threading the pedal into the opposite side of the crank arm. If it will start from the back, there's a chance that doing this alone will clean up the damaged threads. If the pedal thread isn't long enough to reach the outer portion of the threads in the arm, you may need to find someone with the appropriate tap to clean them up. Either way, unless someone fully threaded a pedal into the arm with the threads crossed, you likely don't need a new crank arm.
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Old 07-15-14, 08:41 AM   #9
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Yep, I made the mistake of not understanding the difference in the left and right pedal threads. I thought my mistake was terminal, but a quick stop in the LBS proved otherwise. They chased the threads back to normal and it cost me barely anything compared to replacing the crank arm.
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Old 07-15-14, 08:55 AM   #10
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Thank heaven for the 41.
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Old 07-16-14, 11:59 PM   #11
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Hey, thank you all for the good advice. Whet I ended up doing is using an old peddle and screwed it in from the inside all the way out and that was enough to fix all the threads. I followed what joejack951 just posted and now I have a functioning peddle. I really appreciate the help here!
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Old 07-17-14, 07:37 AM   #12
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Excellent outcome!
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