My 09 model 740 bottom bracket is broken

It has nothing to do with the crankset, mainly because the screw tooth pattern in the bottom shaft is slippery, resulting in the screw not being able to be locked, and the crank will fall off when riding. You need to replace the bottom bracket, but you also need to remove all the cranks and chainrings on the left and right sides before you can replace them.

Of course, if you just bought it, you can take the invoice to your store and ask them to change a central axis for you for free.

This is a crank. If the old pine I suspect it has been slippery.

Crankset, change M361, 170 pieces, bottom bracket cheap VP seal, 25 pieces each.

Foot pedals, cheap VP550 25, Wellgo M20 7,80, MG1 180-200, WR1 around 150.

It's not a crank or a bottom bracket sliding teeth, first change a maintenance-free bottom bracket, try to see if the bottom bracket part is broken, if it's still the case, it is recommended to replace the crankset crank, two add up, 200 should be done within 200.

It is recommended to take it to the store you bought and let him change a waterproof screw on the bottom bracket.

If you really want to change it, the square hole bottom bracket, the cheap VP is 20-30 yuan, and the good SHIMANO is 60 yuan.

Even the crankset is replaced with a hollow integrated crankset of deore, including the bottom bracket, more than 400 yuan for a set of pedals to change the bearing, the general Wellgo M20 80-90 yuan. The better ones range from 100 to 300, depending on your preference.

20 quick money is enough for a place to repair bicycles.

No matter how ordinary the bottom bracket, it will not be replaced after a few months of riding, 740 should be used is a maintenance-free square hole bottom bracket, the quality is definitely better than the marble loose bead center on the vegetable car, the general riding is no problem, as for the large intensity of off-road is also enough, the so-called problem, many are not paid attention to maintenance, or excessive use of the cause, no matter how good the thing, can not stand the blind play.

09 hasn't been out for a few months.

But it's not good to go.

Congratulations, you got it right. Generally, it is not bad to ride, if there is sand and mud in the mountain or you have strong King Kong legs, it will not be able to hold it.

The bottom bracket is the rotating part installed in the bottom bracket of the frame to connect the left and right cranks. There are three common types of sports cars: square hole, spline and one-piece.

The central axis is not expensive, and the owner of the store will help you repair it. Twenty or thirty is OK.

Tell you, the crankset of the Warrior 550 is ProTeeth ISA312P, ** only twenty or thirty on the top, and the SIS front dial is only thirty or forty is enough, so the bottom line is not expensive. Definitely below this**.

McLus has you covered:

Yes, above 1300 is basically sealed.

The simple way to distinguish is whether the place where the frame is installed on the central axle is convex or concave, and the concave and small square teeth like gears are sealed or semi-sealed.

The duke's bottom bracket is a sealed bottom bracket. The warriors are all sealed central shafts, not to mention the dukes.

Grandmaster McLus said it well. The points should be taken away by the family.

Officially, it is sealed, but the tightness is questionable.

Therefore, when washing the car, be careful not to flush the water against the bottom line.

Change the central axis, 400 oceans, I don't know how much money you have prepared.

What is the taper at the junction with the crank on the bottom bracket of the bike? Question added: I think they should add a point in the "Bicycle National Standard": which part of the crank of the bicycle that the landlord is talking about? Finally, there is a sketch that indicates one.

The two are equivalent to bolts and nuts, the two ends of the central shaft are threaded, and the middle is hollow, so it is a perfect combination.

If the bottom bracket of the bicycle is broken, the bottom bracket needs to be replaced.

Drive (transmission or travel) system: It is composed of pedals, bottom bracket, crankset, crank, chain, flywheel, rear axle, rear wheel and other components. The pedaling force of the human foot is transmitted by the pedal through the crank, sprocket, chain, flywheel, rear axle and other components, so that the bicycle continues to move forward.

The key moving friction parts of the bicycle are the center bracket and the front and rear axles, all of which are lubricated with ball bearings and grease. During each overhaul, the balls and the bead groove and the cover should be cleaned, the bead groove should be coated with grease, and the special balls (beads) with smooth and complete surface and uniform particles and consistent size should be placed around the shaft, and then the cover should be put on, so as not to mix the dust and impurities. However, on bicycles, it is a special case, in order to simplify the equipment, the grease nozzle is used, and the only way to improve lubrication is to refill the lubrication.

I've also had this problem, just knock two hammers on the car repairer, (one side with an iron hammer, the other side with a wooden hammer), you can also try it, if it doesn't work, just find a car repairer.

You can consider pushing to the bicycle repair shop...

Generally, they are replaced together, because some look good, but they are actually damaged!

The old version, how to repair the rear wheel of the variable speed bicycle is broken?

Faint: This is also posted on the Internet.

Who knows?

It's better to fix it later.

If you don't have time to shout, Li Jian will endure again.

If you are lucky, you will get through it.