Bike Cog
How to Take off the bike wheel ?
After the brakes are loosened, you’re ready to remove the wheel. To remove a wheel, follow these steps:
- Shift the chain to the smallest cog in the back, so that the chain and derailleur have more slack and are out of the way. If you’re removing both wheels, remove the front wheel first, because it’s the easier of the two.
- For wheels that use axle nuts: Use the proper size wrench to loosen one side slightly and then the other, alternating until the wheel is free. Avoid loosening one side all at once, because this could lead to problems with the bike’s hub bearings. If you have two wrenches, you can undo both nuts at the same time.
- For quick-release wheels: Pull the lever away from the bike. The initial release of the lever may be enough to free the front wheel. If not, hold the nut opposite the lever with one hand and rotate the lever a few times to loosen it.
All newer bicycles have some type of safety retention device to hold the front wheel in the frame, even if the quick release is opened or the axle nuts have been loosened. If your front fork has a clip-on type of safety retention device, disengage it. If the safety retention device is molded, cast, or machined into the front fork dropouts, loosen the tension, adjusting it enough to allow removal of the wheel.
If you’ve successfully taken off the front wheel, you’re ready to remove its more challenging counterpart — the rear wheel. Unlike the front wheel, which practically drops off the bike after you release it, the rear wheel has the chain and derailleur wrapped around its cogs. To free it you need to:
- Loosen the nuts or the quick release for the rear wheel in the same way as you did for the front. This time you may need to give the wheel a stiff blow from the rear of the wheel toward the front of the bicycle to jar the axle loose.
- Move the wheel away forward and downward from the derailleur to let the chain fall off. If this doesn’t work, you may have to get a little dirty and lift the chain off the cog with your hand.
Don’t be afraid of the chain, derailleur, and cogs when you remove the rear wheel. The chain and rear derailleur will stay attached to the bicycle frame and the cogs will stay attached to the rear wheel. You won’t affect any of the adjustments.
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Basic Bicycle Repairs : How to Install a Bicycle Cog
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