SOURCE: removal of sprocket and gears from rear tire for replacement
A special sprocket removal tool is required usually only $20 to $30 bucks at a decent bike shop.
SOURCE: On my Mongoose i tred to fix a rear flat and when
1. You need to make sure the tube doesnt have more than one piercings [inflate the tube and, using a bucket of clear water, immerse it and observe any air outlets. if you have a pen or marker, mark them]
2. Make sure the valve of the tube really is tight enough. If it isnt, use a valve spanner to tighten it, but make sure you dont do it too hard, or else it will snap.
3. You'll need to check the tyre for any sharp objects that could have got stuck in it and are causing new punctures
4. You need to make sure that both the tube and patch are course enough to be glued to each other when you apply the contact adhesive to them.
5. When you apply the adhesive, depending on the brand, you wont need to 'immediately stick the two surfaces together, let a bit of fresh air dry them a bit, [this would imply waiting for minute or 2] then patch things up
SOURCE: how do you change a 20
This is how to fix the tire:http://www.youtube.com/watch?v=pzr_RGTWWoc I unfortunately haven't seen any good videos on rear BMX wheels and tires. If you already have the wheel off, you can just follow the video and then reverse the steps you took to remove the rear wheel. If not, you will first have to make sure all the air is out of the tire. Then if there are stunt pegs on the rear you will need a deep socket that fits the wheel nut and an extension bar and ratchet wrench. The reason to have the tire flat when removing and installing the wheel is so you can get past the brake pads if you have rear brakes. If you have pegs it is easier to remove them completely so you can unhook the chain from the rear freewheel. When reinstalling the wheel, you have to apply tension to the chain by sliding the wheel back before tightening the nuts. It is easier if you center the wheel and tighten the nut on the side opposite to the freewheel just snug enough so the wheel won't move forward. Then put tension on the chain side and tighten that nut. Alternate this procedure until the wheel is centered and there is proper tension on the chain. Proper tension is when you back pedal by hand and it feels smooth not stiff and the chain does not sag.Once the wheel is installed with a new tube or both a new tube and tire you can look on the sidewall of the tire for how many pounds of air to inflate it to. I know this sounds confusing and it is tricky to do by yourself but once you've done it successfully it becomes easier each time. If you don't have the tools it is easier to have it done at a local bike shop. It is worth the money.Here are a couple more websites to search through for more information:http://www.parktool.com/repair/readhowto.asp?id=144 and http://sheldonbrown.com/gloss_e-f.html#flatland I hope this helps and please get back to me if you need more help.
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