do you need specific rims / tyres to go tubeless?
both yes and no.
proper tubeless setups have rims with no nipple holes and tyres with a slightly thicker side wall.
nothing stopping you running a ghetto tubeless setup though.
just get a 20" tube put a bit of air in it and stretch it around the rim, cut it down the middle and fold each edge over the sides of the rim.
then follow the instructions for regular tubeless, and trim back the excess inner tube.
i'm not using specific UST tyres on either setup, but i'm not running them at low pressures.
so, at the risk of sounding like a complete donut... i stretch a 20" tube around the rim putting the 20" valve through the valve hole rather than using a self sealing valve unit.
i then stick a scalpel through the outermost layer of tube & peel it like a banana, put each edge over the rim, fit the tyre inside then inflate & trim back.
so far so good, next question, what benefit does this have over the £45 / £50 stans's conversion kit (aside from cost) and finally, can i still bung a tube of stans inside to puncture proof the tyres?
edit: youtube is a wonderful thing! looks like i'll be giving this a crack at some point in the not too distant future. are there any drawbacks to doing this on rim barke rims as opposed to disc? (does the braking force acting on the rim affect it?)