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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 12-12-07, 11:08 PM   #1
shotgunshoe
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couple questions

Hello im about 370 lbs , and just started riding a fixed gear mtb conversion i just got done putting together . Im having a problem with my left crank arm nut loosening while riding ,the arm has actually fallen completely off once .What would be the solution to htis problem ?And ,can you put a 26x2.0 tire on a 26x1.5 rim , or a 26x1.5 tire on a 26x2.0 rim? your help would be greatly appreciated . thank you
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Old 12-12-07, 11:18 PM   #2
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Originally Posted by shotgunshoe View Post
Hello im about 370 lbs , and just started riding a fixed gear mtb conversion i just got done putting together . Im having a problem with my left crank arm nut loosening while riding ,the arm has actually fallen completely off once .What would be the solution to htis problem ?And ,can you put a 26x2.0 tire on a 26x1.5 rim , or a 26x1.5 tire on a 26x2.0 rim? your help would be greatly appreciated . thank you
26X2 tire will go on a 26X1.5 rim nicely.

Crank nut: Proper torque and Loctite Blue on the threads should do it and you won't need a torch to remove either. Confirm this in the mechanics forum to be sure though.
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Old 12-13-07, 09:53 AM   #3
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It's possible the arm has been worn in the middle which is why it's unwinding.
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Old 12-13-07, 02:10 PM   #4
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Are these square taper or?
There are 2 standards used in sq. taper cranks, with the angle of the taper slightly different.
IF it's a used crank, it may have been "messed up" before you got it.
Typical torque, IIRC, is 30 FT-LB. You might just go ahead and exceed that some if 30 isn't doing the job. A 24x series loctite should do the job. That would let you know if the problem is the bolt/nut backing off, or if the taper/spline is damaged.
Fixed gear! Your knees are a lot better than mine!
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Old 12-13-07, 06:18 PM   #5
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Your crank arm is probably shot. Replace it and make sure you retorque the new one after the first few rides.
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Old 12-13-07, 06:21 PM   #6
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i feel like the nut isnt getting enough of the thread , i got the hammer out and tried to force the arm in as far as possible but it would still loosen after about 15 mins orf riding . The arm has got a sguare cut and it seems like the receiver tapers so im assuming thats what it is....
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Old 12-13-07, 06:22 PM   #7
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oh yeah and the arms are brand new bulletproof
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Old 12-13-07, 08:52 PM   #8
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After tightening, ride a couple blocks and retighten. Repeat at (hopefully) increasingly longer intervals, until they seem to NOT loosen anymore.
I was doing some crank swapping a little while back and just carried the wrench with me, while running errands. It took 3-4 "repeats" until they were tight enough to stay.
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