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There are different procedures depending on the type of bicycle and the various brake and axle bolt configurations. This is one fix where it is best to check a youtube video.
This is a synopsis:
-move chain to smallest sprocket;
-if non-disc brake, release brake tension; otherwise tire may catch on the brake pads;
-turn bike upside down (place old towel under seat and handlebar);
-loosen/remove quick-release bolt; or use two wrenches to remove the axle nuts and bolt if so equipped;
-gently pull the wheel up. You may have to move chain around a bit. Dont forget to look at how the chain mounts on the sprocket for reassembly (take a photo if you must);
-remove tire valve cap. if tire has a presta valve (skinnier than a car tire valve), remove the nut.
-Here is tricky part: use tire levers to remove tire from the wheel. Only use plastic levers and you only need two.
-once one side of the tire is off the wheel, pull out the tube.
-air up new tube just enough to hold the circle form and start by inserting valve stem through hole in wheel and work rest of the tire around the wheel.
-here is trickiest part: use hands only to start rolling the tire over the wheel. Never use any levers for this part or you will pinch the new tube and cut a hole into it. The last ten inches or so will be the hardest part. If you 'message' tire bead into the wheel, you will get the extra millimeter or two to slip the last part of the tire over the wheel.
-once tire is on the wheel, center the valve stem if it is crooked. Then air up the tire and reassemble wheel on the bike.
If your simply replacing it with a new one or installing an inner tube you take a sharp knife and cut back side off. Don't cut completely as you want to catch that piece before it falls inside the tire. Then you simple pull the stem breaking that piece off, catching the back piece as it falls.
If you wanting to put back in a new stem for tubeless use you need a t-shape valve core wrench. After you place the new stem in the hole you thread the tool on and pull the new stem into place.
air it up and spray it down with mild soap and water mixture (gallon of water with a teaspoon of dish soap mixed in). where it bubbles is your leak. spray whole tire (tread and sidewall), the edge of wheel where tire bead is seated to it and the valve stem. If there is one or 2 leaks on tread, you can plug with automotive tire plugs. More than that and you should buy a tube.
Be ready, this is a little bit of a dirty job, have rags handy.. What you need to do is coax the tube back inside the tire, without damaging it. Use hands only, no screwdrivers or other tools.
Sometimes letting all of the air out helps, some air back in helps...but you need to wind up with the tube fully inside the tire and NOT at all in the tire bead to rim area. This is where the add air helps... When you achieve the above steps, you need to ensure that the tire bead (the part that actually touches the wheel) is even and seated all the way around. INSIDE and OUT... Then add air and often check that the tire bead is still correctly located inside the wheel. (What happens is the bead goes deep into the rim on one side, and that allows the tire to go clear past the wheel on the other side...Just center everything..) Then blow the tire up to the correct pressure. I think you want to be a little on the high side, as the tires need to be able to roll with low resistance, and that takes pressure. I hope this helps. Check all of the other tires for issues and pressure and cruise on. Doc
Sounds like you may need new tubes. Tubes may be purchased from bike shops, most hardware stores, and some big box retail stores like Kmart and Target, to name a few.
If the leaks in the tubes are reasonably small, there are several products that can be squeezed into the tubes to seal punctures - both existing ones and ones that occur after the product is added. They are put into the tube through the valve stem, similar to adding air). Two that I know of are Fix-a-Flat and Slime. Both can be purchased at most hardware and automotive stores.
Changing a tube is not terribly difficult but can appear daunting if you've never done it before and don't have some of the tools required.
Hereare step-by-step instructions for most styles bicycle:
Loosen thenuts that hold the axle to the frame.If they are extremely tight, spray some lubricant on the nuts - a siliconelubricant or even vegetable oil will do the trick.
Take thewheel out of the frame. If it's therear wheel, you will need to lift the chain clear of the gear cluster. To easethe removal of a rear wheel, shift the chain to the smallest gear on the wheelbefore loosening the skewer or nuts. If it's the front wheel, that one will bea little easier. You may also need to release the brakes if they interfere withwheel removal.
Deflate thetube completely by pressing down on the inner part of the valve.
Take acouple of tire levers (you can purchase these at your local bike/outdoor store). You can use the handle of a spoon or similarobject if you don't have tire levers but be very careful, as you riskscratching or damaging the rims of the wheel and/or puncturing the inner tube.Ease one lever in under the wheel rim and lever out the edge of the tire(taking great care not to puncture the inner tube) and pry it up over the wheelrim. Move around the rim about an eighth of the circumference and repeat theprocess again, leaving the first tool in place. Now zip the second lever aroundthe wheel and the tire should come right off on one side.
Remove thewheel and tube completely.
Replace theinner tube
Check thetire wall for an arrow or similar to indicate the direction of rotation - sometires have a "direction specific" tread pattern.
Put one sidein first, then ease the partially inflated tube into the tire and locate thevalve in the hole in the rim.
Starting atthe tire edge closest to the valve, use your thumbs to work the other side oftire over the rim and into well.
Beforeinflating, use your thumbs again to ease the tire from the rim all around the circumference,peeking in to make sure that the tire is not pinching any part of the tubeagainst the rim. When youinflate the tube, if it is pinching, it will pop, and you will have to repeatthe entire process, and buy a new tube.
Inflate thetube,checking to make sure the tireis on evenly and there is no "pinching".
You're now ready to put the wheel back on the bike.
You need a set of tire levers to begin with.. anyplace that sells bike parts/tubes tires will have these.. they are just a nicely set of angled thin yet dull levers.
Using the levers you will need to lift one edge of the tire off the rim so the tire is half way on the wheel. To simply replace the tube.. continue on to B.
To completely remove the tire off the wheel.. flip the wheel over and using the levers pry the tire the rest of the way off the wheel. working your way around.. it will be snug then suddenly free.
Replaceing the tire is the same..except you only want to put it on half way before inserting the tube..
B. Remove the air stem cap and if you have the tool to remove the needle valve from the stem.. do that too as to let ALL the air out of the flat.. then pull the bad tube out.
Put the new deflated tube inside the wheel as flat and wrinkle free as possible starting with placing the air stem through the wheel.. and working it around until well seated.. some folks will use a bit of talcum powder on the tube.. usually they come dusted to allow them to properly fit when inflated.
Once you have the tube in the wheel.. start pressing the tire bead back under the rim.. depending on the wheel.. you may want to partly inflate the tube.. just a tiny bit.. so it will not get trapped between the tire and wheel rim when you re-seat the tire.. you can usually re-seat the tire to the rim with your fingers..becareful not to pinch yourself.
Inspect the wheel to make sure no parts of the inner tube is visible.. inflate to proper psi.. put on the stem cap.. replace the wheel.
You can buy a set of tire liners that will prevent punctures.. but of course this involves doing most of the above times four.
Lastly.. if you feel you just can't get it done.. stop by a good bike shop.. they will do it for you in just a few minutes.. possibly for no charge or little charge.
Your inner tube is leaking air. Remove the wheel and remove the tire on one side only (one bead over the rim edge) to allow access to the inner tube. remove the tube and the tire the rest of the way. Basic tire removing tools are neccesary such as tire spoons and rim protectors. check the rim for sharp points as well as any debris that might have punctured the tire. Check the inside of the tire very carefully as well. If somthing punctured the tire it might be still sticking out on the inside - a potential hazard to your fingers. Patch the tube or, better yet, replace it - a much more dependable solution. Install one bead of the tire back on and then the tube. Infate and deflate the tube with one side of the tire off the rim to ensure proper fit and arrangement of the tube inside the tire. Reinstall the tire and the wheel back into the bike following manufacturers recommended procedures and torques found in a service manual.
First try pushing the valve out while your pumping with bugaboo pump. If it blew out need to call bugaboo you have a two year warranty and they will send you a inner tube or a new wheel.