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Old 10-15-09, 01:37 PM   #1
juniorhornlicks
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Stuck Pedals--You Need a Propane Torch

So I had a couple of stuck pedals on my rummage sale mountain bike (I wasn't the one that put them on--I know to grease them beforehand). After trying WD-40, PB Blaster (letting it soak in over 24 hrs), beeswax, and pouring boiling water over the crank arms, nothing worked. They were stuck. Yes, I was turning them in the right direction, BTW.

I finally broke down and got a propane torch from Autozone, heated up the crank arms near the pedals, and they came off in no time flat.

I'm also able to use the propane torch for soldering copper pipes and toasting marshmallows. So I think I definitely got my money's worth.
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Old 10-15-09, 02:07 PM   #2
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Gots to remember to get marshmallows at the store...
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Old 10-15-09, 02:09 PM   #3
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Most likely the combo of PB Blaster and the heat. One question, are the crank arms still usable?
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Old 10-15-09, 03:01 PM   #4
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Yeah currently have the same problem with one of my bikes, except I have xtr spds and they only take hex wrench in the back wich i almost stripped from trying so damn hard.
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Old 10-15-09, 03:53 PM   #5
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they only take a HEX? theat is sort of dumb OH yeah shimano
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Old 10-15-09, 05:48 PM   #6
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Yeah currently have the same problem with one of my bikes, except I have xtr spds and they only take hex wrench in the back wich i almost stripped from trying so damn hard.
Don't use the wrong tool for the job (little itty-bitty L-shaped allen keys). Get an automotive-style ratchet wrench (at least 12" in length) and some of these bits:



I find if you grind 1mm off the tips, you get a nice sharp corners at the end that really grip well.
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Old 10-15-09, 05:53 PM   #7
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they only take a HEX? theat is sort of dumb OH yeah shimano
No, it's not dumb. Most high end road pedals do not feature wrench flats for decreased q-factor.
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Old 10-15-09, 05:58 PM   #8
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No, it's not dumb. Most high end road pedals do not feature wrench flats for decreased q-factor.
Also structurally, you end up with a stronger pedal-axle for the same weight if you don't have flats and sharp edges on it. Perfectly round spindle would be strongest.
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Old 10-15-09, 06:04 PM   #9
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Also structurally, you end up with a stronger pedal-axle for the same weight if you don't have flats and sharp edges on it. Perfectly round spindle would be strongest.
Explain if this

is stronger than this


That is one difference between the dura ace pedals and the rest of the line up.
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Old 10-15-09, 06:11 PM   #10
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Assuming "all else is equal". Meaning same alloys, same construction methods, same loading and usage, etc. Difficult to quantify in real-life situations. But from an engineering & design viewpoint of someone designing a pedal-axle from scratch in Solidworks, if you wanted the strongest design for the lowest weight, you'd make as round and as smooth an axle as possible.
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Old 10-16-09, 09:14 AM   #11
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Most likely the combo of PB Blaster and the heat. One question, are the crank arms still usable?
Yes, I didn't have to heat them that much. I did probably put more heat on the pedals themselves where they attach to the crank arms than I would if I wanted to save the pedals. They were junk, so I just torched them a little too.
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