Question about Cycling
Sue, there are lots of how-to videos out there about this. Just google "How to change bike tube" or tire, or flat. You have to remove the wheel, which is easiest with TWO wrenches - they can be the adjustable "Crescent" wrenches, but don't use pliers. You also have to remove the small screw that holds the fat little L-shaped lever to bike. Use a rag to remove the chain from the cog on the wheel. Then use the little "Tire irons" to remove the tire from the rim and get the old tube out - these come three to a set, the plastic ones are best, and you can get them at K-mart. Also, use some baby powder (talc is better than cornstarch) to make the new tube easier to position correctly in the tire - sprinkle the powder inside the tire when you have if off and put the tube in the tire before you put the tire back on the rim. It helps if you put a little air in the tube to make it a nice sausage first. And make sure you get the valve stem straight and pulled all of the way through the hole in the rim. Be very careful that you don't pinch the tube against the rim when you put the tire back on. And the hardest part might be getting a pump to hold tight onto the valve stem - using compressed air (like at a gas station) is by far the easiest method. Good luck.
Posted on Nov 06, 2012
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Posted on Jan 02, 2017
There are nuts at each side of the axel, on which the wheel turns. These may have to loosened by a spanner or may have quick release levers. If there are levers pull them outwards from the wheel and you can then turn them to release the wheel. Let all the air out of the wheel. Then insert 2 levers under the edge of the tyre, about 6 inches apart and pull the tyre out over the rim of the wheel. Put in your finger and pull the rest of the tyre over the rim. Then lever the other side of the tyre over the same side of the wheel and remove the tube. Replace the tube ensuring that the valve for pumping is in place first. Replace the tyre as far as possible by hand and use the levers for the final few inches taking care not to trap the tube between the lever and the rim of the wheel as this could cut the tube. Place the wheel back on the bike and tighten the nuts.
Posted on Jul 17, 2010
SOURCE: Slipping gears on bicycle
Make sure the rear wheel axle is snugged up against he dropouts in the frame and that the wheel is centered in the brakes. Also, check the seating of the shifter cable at each end, but most likely at the rear shifter, to make sure the jacket is inside the ferrule.
Of course, it is impossible to get a sense for how well maintained the bike is. Perhaps the shifting problem's appearance is not related to the wheel removal and may be something else like bad cables or cable housing. The cable should slide easily in the housing. Shift the bike to its lowest (easiest) gears in front and in back. Then, without moving the crank, manually tug on the rear shifter cable from the rear and push it in. Resistance is bad. Sometimes a bit of lube inside the housing will buy you some time. Use something thin and squirt a little into the end then cycle the cable in and out to distribute it.
If you don't have a bike repair stand, find a small tree with a stout, narrow, low horizontal branch about shoulder height and hook the front of your seat on it so you can spin the cranks and test the shifting. If it's hard to downshift the rear (pulling cable into the housing) it will likely not freely shift upward because the only froce pulling the cable out is the little spring in the derailleur.
Shift to the highest (smallest) cog and sight along the axis of the it and the two rear derailleur pullies. They should all be in the same exact vertical alignment. If they're parallel but not aligned you can adjust the barrel on the cable at the derailleur. Try a small turn then shift up and down while turning the crank to get the cable and shifter to settle where the new adjustment wants to be.
If you ride regualrly it would be worthwhile to find a local bike shop (LBS) and get to know them. They can teach you some self sufficiency in exchange for a little business from you.
Posted on Apr 29, 2009
You probably can't obtain an original part but if you can get the pedal off the crank ( right pedal unscrews counterclockwise, left pedal unscrews clockwise) you can take it to a good bike shop to match it up to a new one. You will probably have to buy a set unless they have a spare in the shop. Hope this helps.
Posted on May 26, 2009
A good bicycle dealer?repair shop should be able to help you. Take the seatpost and old seat if you have it with you and they can sell you one. They will definitely need the seatpost to match the seat.
Posted on Jul 10, 2009
Look for the manufacturers name and model number on the gripshift and check at www.parktool.com. Look under derailleurs for repair tips which will give you an idea how they work. A twelve speed has six gears on the rear sprocket and two on the crank giving you a combination of twelve speeds. sheldonbrown.com is another good site with good articles and pictures.
Posted on Jul 17, 2009
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