I would like to buy a new bike but can't really justify the expense so instead I'm 'reconfiguring' some of my existing bikes and will try a bit of self-hypnosis to convince myself that these are, in fact, spanking new bikes. To this end I've now got a mtb frame with 27" wheels and have encountered a brakes problem that would have been obvious to everyone else I'm sure. My existing cantis won't adjust far enough to reach the rims - what is my best solution? Assuming there is one of course. Do Super-adjustable cantis exist to combat this? Can I fit road bike calipers instead and expect them to work with my current LX STI levers?