New life for stripped crankset
02-10-08, 10:28 PM
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New life for stripped crankset
I'm building a fixed gear polo bike on the cheap and have been pulling parts from my parts box to put on a sturdy lugged omega frame I found. I have a truvativ fixed gear crankset with one stripped pedal thread, Is there hope for salvaging this crankset? Does locktight work? Or is there a liner that can be used? This is not going to be a commuter or real road bike - just a knock about polo bike.
02-10-08, 11:23 PM
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In theory inserts could be placed to repair the thread. Locktite, short
of the industrial strength stuff needing an oxy torch to remove is unlikely to work.
JB Weld is similar and worth a try but really, surplus old cranks are a 'dime a dozen'
if you check LBS where cast offs stack up and should be available cheaper than
a 1/2 donkey solution, especially if the L crank is involved. If you gamble on JB
or heavy duty locktite, adding a couple of allen set screws on either side by
drilling and tapping the 9:00 and 3:00 positions or at least the 6:00 position to
help lock the shaft in place. I doubt any of the epoxy variants are strong enough
for this duty though.
of the industrial strength stuff needing an oxy torch to remove is unlikely to work.
JB Weld is similar and worth a try but really, surplus old cranks are a 'dime a dozen'
if you check LBS where cast offs stack up and should be available cheaper than
a 1/2 donkey solution, especially if the L crank is involved. If you gamble on JB
or heavy duty locktite, adding a couple of allen set screws on either side by
drilling and tapping the 9:00 and 3:00 positions or at least the 6:00 position to
help lock the shaft in place. I doubt any of the epoxy variants are strong enough
for this duty though.
02-11-08, 07:29 AM
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If you gamble on JB
or heavy duty locktite, adding a couple of allen set screws on either side by
drilling and tapping the 9:00 and 3:00 positions or at least the 6:00 position to
help lock the shaft in place. I doubt any of the epoxy variants are strong enough
for this duty though.
or heavy duty locktite, adding a couple of allen set screws on either side by
drilling and tapping the 9:00 and 3:00 positions or at least the 6:00 position to
help lock the shaft in place. I doubt any of the epoxy variants are strong enough
for this duty though.
02-11-08, 09:14 AM
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My set screw/JB weld offering was tongue in cheek, I don't really advise
doing this. Surplus cranks are not hard to find and there is no great virtue in
fixie cranks unless you are a clyde or 400watt type. It was offered in a
spirit of Make magazine.
doing this. Surplus cranks are not hard to find and there is no great virtue in
fixie cranks unless you are a clyde or 400watt type. It was offered in a
spirit of Make magazine.
02-11-08, 11:06 AM
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Your LBS can repair the stripped crank at small cost ($10?).
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02-11-08, 12:18 PM
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Not even the strongest locktight will hold in this application for long. I would doubt that JBWeld would either, since it is just epoxy which has low shear strength.
LBS can put a heliocoil in for not much money. Or find another random arm and put it on there.
LBS can put a heliocoil in for not much money. Or find another random arm and put it on there.
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02-11-08, 07:14 PM
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Thanks for the advice. I'll check the LBS for retapping. It looks like there's a market for orphan crank arms out there.
