Why Does My Left Crank Arm Keep Coming Loose

September 24, 2021 Post a Comment

The issue with that type of crankset is that riding the bike with either arm being loose at all starts causing permanent damage. Surprised its not an interference fit the crank arm it comes right off.

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I have a truvativ stylo gxp crankset with a left crankarm that keeps coming loose.

Why does my left crank arm keep coming loose. Why does my crank arm keep coming loose. Why does my left cranks arm keep on coming loose. If your cranks are square taper once youve had them come loose youll have dammaged the taper and they will keep coming loose.

Theres a bit of a theme going on here though with crank arms coming loose. Aluminum is softer than steel so if the interface is loose at all you start rounding out the opening for the spindle. -if your crank is developing the profile wobble check and see if when the bolts are tight if the crank arm can be moved up down on the spindle slightly not side to side this indicates that your splines are wearing out is why it keeps coming loose-if your threads in the spindle and the bolt are still good and not stripped.

Thats because the spindle the axle the crankarms spin on is made of steel and the arms are aluminum. When the crank loosens the arm rocks back and forth slightly rounding out that square. The same thing is happening over in the shimano forum.

Blue Loctite but in a pinch any kind of glue works on the threads. The areas of the nut that are no longer black are aluminum build up from the crank arm not the black coating wearing away. Since they dont sit solid on the spindle they start to wobble which works the nut loose.

With these Id use loctite. The bolt pushes against the metal piece as it unscrews forcing the crank arm to come off the bottom bracket axle at the same time. Re-torqueing the bolt will keep the arm on for.

Why does my front derailleur wont shift to the highest gear. Im also going to clean the ends of the crank shaft and crank arms and use some contact adhesive. The first time it felt loose I only tightened it and it was allright and then it came loose again and replaced the crankbolt.

The splines on the crank arm can be ovalized or otherwise damaged if ridden when loose. Theres no such thing as a good quality steel crank. A neighbor kids bmx left crankarm kept coming loose so I pulled the crankarm off cleaned it good didnt really notice any excessive wear or.

Hi to all. I used to do that with square taper cranks - I could always get them off but they never came loose. Re-torqueing the bolt will keep the arm on for a short amount of time but eventually will critically damage the crank arm.

This creates a situation where its hard to keep things tight it comes loose again does more damage and the cycle repeats itself until the. In this situation you dont want this to happen so remove the metal piece first. The metal piece will probably unscrew clockwise reversed.

Most likely these screws are either stripped or damaged and no longer apply enough pressure to keep the crank arm in place. You could try tightening with lots of torque grease on the square taper and threadlocker eg. Start date Mar 12 2009.

If youve been repeatedly riding with a loose crank arm it could be that its now damaged. It doesnt have to do with quality. I agree with you - I either lube or use loctite.

The only fix to that is a new crank arm. How to Remove Oil from Disc Brakes Like a Pro. Why does my rear derailleur wont shift to lowest gear.

Fortunately if you only want to replace. You can try locktite but Ive had no success with that either. All cranks will do this.

Whats most likely happening when a bolt will not keep a crank arm tight on the spindle despite being tightened to torque is that the crank arm interface is damaged in some way. Maybe think about that. If you found a piece of metal over the crank arm bolt which let you see the bolt but not remove it this is a self extracting bolt assembly.

If youve been repeatedly riding with a loose crank arm it could be that its now damaged. Since the arm is aluminum and the bb spindle is hardened steel it is usually the arm that is damaged. Get a new crank arm left only and another new nut for good measure.

When the crank arm is. Mar 12 2009 1 yeh my crank keeps on coming loose and i keep on tightening it what is happening is it going to snap. It lasted for about 2 months when I went for a weekend outride the left cran.

As someone pointed out above with a newly fitted crank it will bed in and needs regular tightening for a few days. You can tighten that bolt and everything feels fine until you start riding and putting pressure on the arm and it wiggles its way lose again. Why does my left crank arm keep coming loose.

You need a new crank. If the arm is damaged no matter how tight the bolt is torqued it will not stay tight on the spindle.

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