How to disassemble a chainring wheel on a bicycle

How To Change Chainrings. Changing Your Chain Rings For Road Or Mountain Bikes

How to replace front sprockets on a bike?

disassemble, chainring, wheel, bicycle

Change chainrings on your bike with our step-by-step video tutorial. Replacing the sprockets on a road or mountain bike is a fairly straightforward task, but one that needs to be done urgently when the cogs wear out. You can swap the chainrings to change the gear ratio, lowering which will make it easier to climb slopes, and increasing it will speed up in flat races.

Before starting work, find out the exact landing diameter (PDD) of your leading star system before purchasing new ones. Typically PDZ 110 or 130 mm. or significantly reduced or traditional size. If the bike is equipped with a 50x34T system, then the PDR is almost certainly 110 mm. If it is 53x39T, then the PDZ will be 130 mm.

Of course, you can always measure the circumference of your system to be sure. There are exceptions, such as the “four feet” used in Shimano’s newest 11 speed hitch, for which sprockets of various sizes are available without worrying about the difference in PDL.

How to replace asterisks?

If your goal is not just to replace the outer sprocket. which can be easily done by removing the fasteners and threading it through the connecting rod. you will have to start by removing the drive sprockets. 2. Some high quality connecting rod systems allow you to remove the sprocket bolts with regular hexagons or special Torx wrenches, but if your sprockets have regular bolts, you need either a special puller wrench that can be placed in the slotted groove of the sprocket nut or another hexagon (often 1 mm larger than the front) to keep the nut from turning. Special key. a puller holds the sprocket nut immobile while unscrewing or tightening the bolt.

Lock the nut and unscrew the bolts counterclockwise. Remove them carefully, they will come in handy for installing new sprockets. You can now remove the old chainrings or clean them thoroughly if you replace only the outer chainring to change the gear ratio.

Replacing stars

When replacing the asterisks, you need to pay attention to their relative position.

The outer star, usually the largest, has a small pin protruding from one side. The sprocket should be positioned so that the pin is behind the connecting rod in order to avoid complete seizure of the chain in the event of its dismounting and falling between the outer sprocket and the connecting rod. The inner sprocket usually has a small marking in the middle of the outer edge, which should also be placed behind the crank.

How To Replace Chainrings Without Removing Your Crank

The chamfered edges of the cogs. which aid in gear shifting. either the brand name or any other markings must be visible from the outside when the sprocket is installed.

Install the sprocket with the markings outward, thereby placing the teeth correctly for smooth gear shifting. When the sprockets are positioned correctly, insert the nuts into the holes. Fix them with a special wrench or hexagons, then screw the bolt into the nut clockwise until you feel a slight resistance, while fastening the sprockets.

Repeat these steps for all bolts, then alternately tighten each bolt a quarter turn at a time until it stops. A torque wrench can be used to do this by tightening the bolts to the torque indicated on the bolts.

Install the sprocket connecting rod onto the axle, remembering to thread them through the chain. Pedal and change gears to make sure everything is working properly. If you have resized the outer sprocket, you may need to readjust the front derailleur for smoother speed changes.

How to remove a star from a bike

In order for the bike to be in good working order for a long time, it is necessary to carry out an inspection from time to time. First of all, the chain comes into a worn out state, and behind it the stars on the wheels are the main components in the gear shifting system. These parts can be removed and replaced by yourself by purchasing the corresponding parts in advance. How to remove a sprocket from a bicycle and replace it with a new one, we will consider below.

You can remove and replace worn-out sprockets on your bike yourself, it’s not difficult at all. Professionals recommend conducting a technical analysis of the bike’s transmission at least once every 2 years, for early identification of problems. Thanks to this, the cyclist will be spared from bitter surprises on the road, on trips, and the mechanism itself and the bike will serve for many years.

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What tool do you need

Shabby sprockets are subject to mandatory replacement, as they take the bike out of service. In order to remove them correctly, it is necessary to supply tools, with the help of which the replacement can be carried out easily without damaging the parts. The stars are divided into two categories in terms of the level of action in the transmission:

  • the system of leading stars (from one to three). located at the crankset with pedals, on the right side;
  • driven. located on the rear wheel, they are in the form of a ratchet or cassette.

Depending on which category of elements on the bike fail, the necessary tools are selected to remove them. Bike Lead System Tools Required:

  • puller for connecting rods;
  • technical grease and napkins;
  • keys. cap and open;
  • hexagons;
  • purchased replacement parts.

With frequent off-road cycling, the smallest one breaks in the leading stars. And at average speeds, on roads with not the best asphalt pavement, the average one fails. If the bike is used for racing at speeds, then the breakdown will be big.

The driven elements fail more often, this is facilitated by the switching of the most popular gears while driving. The tools you will need to remove the sprockets on the rear wheel of your bike are:

  • cassette remover;
  • adjustable wrenches;
  • open-end wrenches for removing the wheel for repair work;
  • whip. a retainer with a chain;

A ratchet drivetrain is commonly found on budget 5-8 speed bikes. And the cassette is a modern and modernized solution that includes, at the moment, up to 12 constituent elements.

What difficulties can there be

If the bike has not undergone maintenance before and the transmission will have to be removed for the first time, then some difficulties are possible:

  • The mechanism twists heavily, it is impossible to disassemble it, and to remove it even with enormous efforts. We will correct this moment. You can stock up in advance with a special aerosol. spray WD-40. It is designed to facilitate repair work with a bicycle and car. It is necessary to treat the desired mechanism with an aerosol and wait for the specified time, after which it will be much easier to unscrew and remove the parts;
  • If you disassemble the cassette inattentively, the parts and fasteners are messed up. In order to avoid this, it is advisable to replace parts carefully, remembering the entire sequence of subsequent steps, possibly with a note, or use the instructions attached to the new bike part.

Cassette manipulation

The rear wheel drivetrain is more complex and consists of many components. When the ratchet becomes unusable, it remains only to remove it with a puller and an adjustable wrench, and replace it with a new one, since it is monolithic and does not consist of individual stars. But the cassette is just to be repaired. To do this, take the following steps:

  • The wheel is dismantled from the bicycle using an open-end wrench. If the mount is eccentric, then it is much easier to remove the wheel by opening the retaining lever;
  • With an adjustable wrench, unscrew the axle nuts (using another nut for convenience) and remove the axle;
  • Install the puller with slots in the grooves of the retaining ring;
  • The whip is placed on a star (preferably a large one) and held;
  • The puller is turned counterclockwise with an adjustable wrench, and the whip is directed in the opposite direction so that the cassette does not scroll. Sometimes you have to make a lot of effort;
  • The retaining ring is unscrewed and the entire cassette is removed. They select the worn-out stars in the mechanism and remove them, replace them with new ones. It is important not to confuse the sequence of disassembling and assembling the cassette parts and the bicycle mountings;
  • After it was possible to remove the parts, you should clean the cassette from dirt, replace the worn out elements and lubricate the mechanism.
  • it is advisable to apply lubricant to the thread of the retaining ring at the beginning of the assembly. then at the next maintenance of the bike the mechanisms will be removed more easily;
  • the stars should be assembled in the same sequence, alternating with spacer rings;
  • put on, twist and tighten the locking ring clockwise;
  • fasten the axle with nuts from the side of the cassette, tighten the chain and put the rear wheel in place.

Check the idling operation of the transmission.

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Sequencing

Consistency in actions is an important point.

System manipulation

Replace the failed stars on the leading system as follows:

  • The axle bolt is removed from the connecting rod on the right side, using a hexagon, and the pedal is unscrewed with an open-end wrench;
  • Install the puller in the connecting rod, clearly along the thread. Then the spanner wrench is placed on the puller and screwed in until it stops. the connecting rod must come out of the carriage shaft;
  • The next step is to remove the drive system from the bike, memorizing the sequence of actions. The large star, as a rule, remains on the connecting rod, and the middle with the small one is fixed to each other by a spider.

Then new elements are placed instead of worn out ones:

  • install new sprockets (if it is small or medium) on the spider mount;
  • replacing the large one is carried out together with the right connecting rod, followed by screwing the remaining stars to it. Depending on the mounting standard, the large chainring can also be removable and does not require replacement of the connecting rods;
  • the assembled structure is installed in a carriage pre-treated with grease and a chain is put on;
  • the connecting rod is scrolled, using a puller, in the opposite direction;
  • all bolts and nuts, plugs that had to be removed earlier, are screwed in strictly in the same sequence;
  • put the right pedal in place and check the movement of the bike elements.

You can remove and replace worn-out sprockets on your bike yourself, it’s not difficult at all. Professionals recommend conducting a technical analysis of the bike’s transmission at least once every 2 years, for early identification of problems. Thanks to this, the cyclist will be spared from bitter surprises on the road, on trips, and the mechanism itself and the bike will serve for many years.

System manipulation

Replace the failed stars on the leading system as follows:

  • The axle bolt is removed from the connecting rod on the right side, using a hexagon, and the pedal is unscrewed with an open-end wrench;
  • Install the puller in the connecting rod, clearly along the thread. Then the spanner wrench is placed on the puller and screwed in until it stops. the connecting rod must come out of the carriage shaft;
  • The next step is to remove the drive system from the bike, memorizing the sequence of actions. The large star, as a rule, remains on the connecting rod, and the middle with the small one is fixed to each other by a spider.

Then new elements are placed instead of worn out ones:

  • install new sprockets (if it is small or medium) on the spider mount;
  • replacing the large one is carried out together with the right connecting rod, followed by screwing the remaining stars to it. Depending on the mounting standard, the large chainring can also be removable and does not require replacement of the connecting rods;
  • the assembled structure is installed in a carriage pre-treated with grease and a chain is put on;
  • the connecting rod is scrolled, using a puller, in the opposite direction;
  • all bolts and nuts, plugs that had to be removed earlier, are screwed in strictly in the same sequence;
  • put the right pedal in place and check the movement of the bike elements.

Cassette manipulation

The rear wheel drivetrain is more complex and consists of many components. When the ratchet becomes unusable, it remains only to remove it with a puller and an adjustable wrench, and replace it with a new one, since it is monolithic and does not consist of individual stars. But the cassette is just to be repaired. To do this, take the following steps:

  • The wheel is dismantled from the bicycle using an open-end wrench. If the mount is eccentric, then it is much easier to remove the wheel by opening the retaining lever;
  • With an adjustable wrench, unscrew the axle nuts (using another nut for convenience) and remove the axle;
  • Install the puller with slots in the grooves of the retaining ring;
  • The whip is placed on a star (preferably a large one) and held;
  • The puller is turned counterclockwise with an adjustable wrench, and the whip is directed in the opposite direction so that the cassette does not scroll. Sometimes you have to make a lot of effort;
  • The retaining ring is unscrewed and the entire cassette is removed. They select the worn-out stars in the mechanism and remove them, replace them with new ones. It is important not to confuse the sequence of disassembling and assembling the cassette parts and the bicycle mountings;
  • After it was possible to remove the parts, you should clean the cassette from dirt, replace the worn out elements and lubricate the mechanism.
  • it is advisable to apply lubricant to the thread of the retaining ring at the beginning of the assembly. then at the next MOT of the bike the mechanisms will be removed more easily;
  • the stars should be assembled in the same sequence, alternating with spacer rings;
  • put on, twist and tighten the locking ring clockwise;
  • fasten the axle with nuts from the side of the cassette, tighten the chain and put the rear wheel in place.
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Check the idling operation of the transmission.

What tool do you need

Shabby sprockets are subject to mandatory replacement, as they take the bike out of service. In order to remove them correctly, it is necessary to supply tools, with the help of which the replacement can be carried out easily without damaging the parts. The stars are divided into two categories in terms of the level of action in the transmission:

  • the system of leading stars (from one to three). located at the crankset with pedals, on the right side;
  • driven. located on the rear wheel, they are in the form of a ratchet or cassette.

Depending on which category of elements on the bike fail, the necessary tools are selected to remove them. Bike Lead System Tools Required:

  • puller for connecting rods;
  • technical grease and napkins;
  • keys. cap and open;
  • hexagons;
  • purchased replacement parts.

With frequent off-road cycling, the smallest one breaks in the leading stars. And at average speeds, on roads with not the best asphalt pavement, the average one fails. If the bike is used for racing at speeds, then the breakdown will be big.

The driven elements fail more often, this is facilitated by the switching of the most popular gears while driving. The tools you will need to remove the sprockets on the rear wheel of your bike are:

  • cassette remover;
  • adjustable wrenches;
  • open-end wrenches for removing the wheel for repair work;
  • whip. a retainer with a chain;

A ratchet drivetrain is commonly found on budget 5-8 speed bikes. And the cassette is a modern and modernized solution that includes, at the moment, up to 12 constituent elements.

What difficulties can there be

If the bike has not undergone maintenance before and the transmission will have to be removed for the first time, then some difficulties are possible:

  • The mechanism twists heavily, it is not possible to disassemble it, and to remove it even with enormous efforts. We will correct this moment. You can stock up in advance with a special aerosol. spray WD-40. It is designed to facilitate repair work with a bicycle and car. It is necessary to treat the desired mechanism with an aerosol and wait for the specified time, after which it will be much easier to unscrew and remove the parts;
  • If you disassemble the cassette inattentively, the parts and fasteners are messed up. In order to avoid this, it is advisable to replace parts carefully, remembering the entire sequence of subsequent steps, possibly with a note, or use the instructions attached to the new bike part.

How to remove a star from a bike

In order for the bike to be in good working order for a long time, it is necessary to carry out an inspection from time to time. First of all, the chain comes into a worn out state, and behind it the stars on the wheels are the main components in the gear shifting system. These parts can be removed and replaced by yourself by purchasing the corresponding parts in advance. How to remove a sprocket from a bicycle and replace it with a new one, we will consider below.

How to do without a special puller

In order for the equipment to serve as long as possible, it is recommended to remove and replace the worn out parts of the bicycle with a special tool. But there is an option of how to remove the elements of the driven part of the ratchet without a special puller:

  • Prepare tools that are in any garage or pantry: center punch, hammer and gas wrench;
  • The center punch is inserted into the two existing recesses in the ratchet and gently hit with a hammer, in a clockwise direction. The impact force must be calculated accurately so as not to damage the bearings below;
  • The ratchet is removed with a gas key, replaced with a new one. The new drivetrain is secured back to the bike.

Replacing a cassette on a bicycle without using a puller is not recommended, since it will not be possible to carry out this manipulation without damaging the transmission. The bike will have to be returned to the workshop for repair.