Mountain Biking - A Clicking sound has Developed.
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After many smooth runs on my Giant MTB, after todays ride Ive noticed a distinct clicking sound coming from the crank. The sound only appears when i push hard on the pedals to move forward quickley. Im pretty sure its from near the crank somewhere.
Any suggestions? Anyone had this before??
09-30-08, 10:27 PM
can be a one of many things, first off i'd say eliminate the easy to fix, loose chainring bolts, pedal problems, somthin with the front derail and chain. But most likely it is either loose crank arms, or dirty/dry bottom bracket threads, it could also be a dead bottom bracket, or a loose one, but thats less likely. Anyway, hold your frame and try to wiggle your crank arms side to side, I find its easiest to hold the bike with your upper arms/torso (arm over the top tube) and put a hand on each crank arm when they are at 12 and 6 o'clock, if you get any play then you crank arms are loose and need to be tightened, even if you feel no play this could still be the problem, the crank bolts need to be tightened to 30ft/lbs assuming splined/isis/octalink/squar tapered setup, if you have an external BB you may still need to hit that 30ft/lbs, if you have only 1 bolt on the nondrive side and no pinch bolts then 30ft/lbs, if you have pinch bolts then you neede to tighten the main bolt like you would a headset, don't overtighten. So if that wasn't your problem then pull the cranks off and pull your BB, clean all the threads, grease, and reinstall torqueing to 35 ft lbs. You will prolly need to head into a shop for that unless you have a torque wrench crank puller and BB tool.
If you have a full suspension make sure all your pivots are tight, i've seen people mistake loose pivots for crank or wheel problems.
fyi BB just need to be pulled once in a while cause the threads go dry after so many miles and they start to get noisy, somtimes crank arms just need to be tightened, it just happens, bearings in BB go bad
Its definitely the pedal bearings.
Thanking you for the informative reply, ill definalty try that out when i return home.
I know its not my pedal bearing as i bought brand new pedals 2 days ago and the sound remains.
Sometimes it's the plastic dust covers on the BB. Pull the crank and remove the dust cover with a pick, pack it with grease and re install new dust covers. 90% of the time it's just this but a lot off people end up changing the whole BB.
If you have to order the covers, pull cranks, re grease, and use the old ones till the new ones arrive. It will shut up for a while with the old ones re greased but it will come back fast. I know it's hard to believe it just this but that's what it is. Let me know if it works.
10-01-08, 02:34 AM
be sure to grease where your bb spines face with your cranks...
just in case that wasn't covered...
I know someone suggested that could be the problem. But don't just tighten them, grease 'em too.
10-01-08, 07:07 AM
^ you assume splined BB, but yes if its splined grease that part if its square tapered actually clean the square taper part and the square taper hole on the crank arms,
hmm never seen just the dust covers go bad but i guess it could be
10-01-08, 07:35 AM
See if it still makes the noise while you're off the bike and pedaling with your hands. I thought my BB was creaking once and discovered it was actually coming from my seat.
Pedals tightened properly? Threads greased?
This might sound weird, but it happens to me (despite the forward facing clamp); Clean and grease the seatpost/seatube. Dirt and moisture buildup there can cause weird clicking and creaking that sounds like it's coming from the crank.
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