Mountain Bike Crank Bolt Keeps Coming Loose
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You just can t go a crank it down and say it s tight.
Mountain bike crank bolt keeps coming loose. The first thing to do is to try and re tighten the crank arm on to the bottom bracket axle. Crank bolt keeps coming loose in mechanics lounge. Get a new cranksset and make sure you tighten the bolts before after every ride. I rehabbed my old mountain bike into a singlespeed.
All the cranks i ve installed i have always used a torque wrench and never had one come loose. I turned for home and managed to lose the bolt on the way home. The best solution is to take them completely off and clean them with solvent. Ususally crank arms come loose because they were not properly torqued from the get go.
Once a crank arm has come loose it is damaged and should be replaced. The problem i m having is the left crank arm will not stay tight. When a bike gets its first tune up which should be 30 60 days from when it was purchased the crank bolts are suppose to be retorqued. This is one area of a bike where the ownership and use of a torque wrench must be used.
Then apply a liberal amount of a bering retaining compound preferably one that is temperature sensitive. As far as missing teeth go. If your crank arms flop with every pedal stroke or if you can wobble them from side to side fix them now before they become irreparable. If this doesn t work the crank loosens after a short period of time or the bolt is missing there are more drastic measures.
If they are coming loose that often your crank arms are likely rounded out from riding them while loose. Your issue is that the retaining bolt is not being torqued to proper spec. Gotta use a torque wrench.