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Questions and answers about sports

Why does a loose pedal destroy the crank threads?

5 min read

Asked by: Christian Ella

Once loose, the pedal spindle will describe a cone as the crank rotates. This concentrates force at certain points in the crank threads, leading to damage.Apr 20, 2018

How do you fix a loose pedal crank?


Quote from video: Really make sure that you hold the pedal. And when you're tightening you want to get. This. On there as tight as you can to keep the crank garment flush with the bike.

Why does my pedal keep coming loose?

The act of the pedal slowly coming loose wallows out the threads of the crankarm, especially the outermost threads. This makes it more susceptible to happening again. If you put it back on tight and it fell out again, it’s almost certain that the crank is shot and you’ll need to replace it.
Sep 18, 2013

How do you fix a cross threaded pedal?

Quote from video: On the condition of the crank arm if you need to replace the threads or you can just run a tap through the threads. They do make a thread replacement that you can purchase you'll need a drill.

Why do bike cranks wobble?

It may just be that it’s a one-piece “cartridge” and is rattling around in the frame, or it may be that the unit is “loose bearings” and the bearing caps need to be adjusted. Or there may have been some sort of failure of the bearings.
Apr 27, 2016

How tight should my cranks be?

Quote from video: We put the tool in the cap. Just a couple of fingers will do us about four inch pounds. Sometimes not that much if you bring the crank arm over to the bearings.

Why is my bike crank creaking?

The most common cause of a squeaky crank is that the bolt is loose. Check for play in your cranks by pulling on one side and trying to wiggle it side to side. If there is play, check that your crank bolts are tight using a hex wrench—bolts should be hand-tight.

How do you tighten a crankshaft?

Quote from video: Now using the screwdriver tighten up the cones they it takes out the play in the cranks and secures the bearings of the correct. Place do not over tighten.

Should you use Loctite on bike pedals?

Don’t use loctite at all! Pedals are designed so they are always rotating in the direction to tighten them, which is why one side is reverse threaded…. So put a little grease on the threads and thread them on. I would tighten them with a pedal wrench fairly snug, not super tight.
Jun 16, 2011

How tight should bike pedals be?

Always be sure to double check that the pedals are tight. They should be firmly snug but don’t have to be herculean tight. Losing a pedal is a recipe for crashing and a loose pedal can damage your crank arm threads beyond repair. Installing pedals is easy when you know what to do.
Jan 6, 2016

How do you fix a stripped crankshaft thread?

Quote from video: And you can take a thread checker like this and verify the thread pattern you can see that 21.5. And I got a new bolt. That's a 1.5 you can see right there.

Can you Rethread a crank arm?

If you have an aluminium crank, then it is possible for the crank to be fixed by creating a new thread with a rethreading kit as described above.
Oct 20, 2020

How do you fix a cross threaded crank arm?

Quote from video: The tool on so that it cuts the threads. Straight. I'm just gonna put like a just a little bit of oil in there to lubricate.

Can you over tighten crank bolts?

if you overtighten a bolt, you will damage the thread. all bolts have a strength limit – depending primarily on the thread diameter. overtightening is a common mistake by amateur spanner twirlers (i.e. most of us). crank arm mounting threads are pretty meaty, you can apply some muscle, but there is a limit.
Feb 26, 2010

How freely should your cranks spin?

The bearings should spin freely with the crank installed too. The cranks should not experience a lot of extra force when you get the spindle to the far side bearing. My 2017 Roubaix had an out of square bb and i had to use a 1 piece bb from bbinfinate.
Feb 24, 2020

How much torque should a crank bolt have?

Crankset, Bottom Bracket and Pedal Area

Component Type/Brand Newton Meters
Crank bolt (including spline-type cranks and square-spindle cranks) Shimano® Octalink® XTR® (M15 thread) 40.3–49
Campagnolo® 32–38
Campagnolo® Ultra-Torque® 42
FSA® M8 bolt 34–39

How do you tighten a crankshaft?

Quote from video: Now using the screwdriver tighten up the cones they it takes out the play in the cranks and secures the bearings of the correct. Place do not over tighten.

How do you tighten pedal bearings?

Quote from video: This is easiest with a lock ring spanner that fits the notches on the ring. Exactly you can also use a universal tool with one tooth or tap it round with a hammer and an old screwdriver.

How do you replace bike pedal bearings?

Quote from video: Now I'll just go ahead and use a big crescent wrench get onto this this la hex part here and we'll just carefully unscrew this part from the bottom bracket.

How do I know if my crank bearings are bad on my bike?

Worn out or dry bearings will feel rough, metallic and dry. Sometimes they’re so dry that if you pull your finger fast across the axle you can make the axle keep spinning because there’s no grease inside the bearings to slow it down.

How often should you replace bike pedals?

As for more durable pedals, Time is as good as it gets in the world of clipless pedals. If you’re going through them every couple years, you will most likely kill any other pedal in well under a year. Best bet would be to hunt down a set of ATACs from around 10-12 years ago or a set of Shimano M747 pedals.
Aug 31, 2013