Part II: Basic Bike Repairs in .NET framework

Make QR Code in .NET framework Part II: Basic Bike Repairs

After you ve released the brakes, follow these steps to remove the front wheel (start with the front wheel it s the easier of the two): If your wheel uses hub nuts or bolts, use a wrench to loosen the axle (as shown in Figure 7-1) Start with one nut, loosen it slightly, and move to the other nut, switching back and forth until you can free the wheel

Avoid loosening one side all at once because this could lead to problems with the bike s hub bearings Alternatively, if you have two wrenches, you can undo both nuts at the same time In place of bolts, many bikes these days are manufactured with a quick release which are loosened by opening the lever on the side of the wheel hub If your wheel has a quick release, open the lever When you release the lever the axle may loosen enough to remove the front wheel If it doesn t, hold the nut opposite the lever with one hand and rotate the lever a few times to loosen it (as shown in Figure 7-2) The quick-release skewer is shown in Figure 7-3 Modern bikes are designed with a safety retention device built into the dropout which holds the wheel in place even when the quick-release lever is loosened There are many different designs, so inspect yours and/or refer to your owner s manual In order to release the wheel, you have to lift and maneuver the wheel off the dropouts of the frame

Unlike the front wheel, which drops off as soon as the axle is loosened, the rear wheel requires another step or two to remove it because of the chain and derailleur being attached to it Here s how to remove the rear wheel: 1 Shift to the smallest cog on the rear, making the chain more slack 2 Loosen the nuts or the quick release for the rear wheel in the same manner as you did for the front 3 To remove the wheel, you may have to give it a slight blow to knock it loose from the frame 4 When it comes loose, move the wheel away from the derailleur (forward and down) to let the chain fall off Don t be afraid of the rear wheel The chain and rear derailleur stay on the bicycle and, by removing the rear wheel, you won t effect any of the gear adjustments In some cases, you may have to use your hand to lift the chain off the cogs or pull back the derailleur from the wheel in order to slack the chain from the cogs

Even if you keep your tires properly inflated and try to avoid obstacles in the road, at some point, if you ride enough miles, you re bound to hit something that will cause a dent in the rim If this happens to you, don t despair You don t necessarily have to replace the wheel Try these steps: Use an adjustable wrench on the lip of the rim as a lever Work little by little on the dent, being careful not to bend the rim too much in the other direction Put the rim into a vise Tightening the vise sometimes will squeeze the dent out of the rim In the case of a dent on both sides of the rim, try laying the rim on a flat surface like a block of wood Using a mallet, try flattening out one dent with a sharp blow Turn the rim over and do the same to the other side

Installing the front and rear wheels is a fairly simple process but one that should not be taken lightly The wheels must sit firmly in the frame s front and rear dropouts If you have anything less than a tight fit, you could be risking the chance of a wheel coming loose, something that would be potentially disastrous if you were biking Follow these steps and you ll be in good shape: