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I split the wheel, BUT, if the tire seems firmly stuck to the rim, before you split the wheel, run by a tire shop and let them use a bead breaker to push the tires off the rim. Just takes a minute and my local shop didn't even charge me. The first time, I tried to do it at home (didn't have a real bead breaker) and it was a royal PITA. Dropping them off at the tire shop was much easier!
John is right on. Make sure they are a careful bunch. I took mine to the local shop and they put a big cut in the side of the tire with the machine they used to get the tire off the rim. Got another one the next day. Still easier than trying to get the tire off of the rim yourself.
That's why I just let them only push the bead away from the edge of the rim and then I split the hub and removed the tire myself. I was afraid if they used the powered pry tool that prys the bead up and over the rim, they might damage the tire, or worse yet, damage or scratch-up the rim!
You can make a very simple bead breaker for these small tyres or buy a bead breaker from the go-kart racing tyre supply guys this works very well.
I just got this bad boy...
and it's the cat's meow. About 100$ on e-bay, slicker than heck and it works on ANY tire. I have ATV's that I restore so it's pretty handy for me with those tires, since they have special lips on them that make them even harder to pop than "normal" tires!
I have got to get one of these. There is a right tool for everything. Thanks Mark.
Figured out my slow leaks (two of my tires were leaking, one in about 20 minutes!) as well. I know you have to "lube" the o-ring to make it airtight but obviously I wasn't putting enough on. I used a boat load this time and lubed the rim edges, the o-ring, the o-ring seating surface and the tire beads themselves. Put them all back together and now it's been 4 days with no leaks. However amount of "lube" you put on the tire and think it's enough TRIPLE IT!!! Now I have a useless tube... guess I can keep it just in case I ever need it.