I have recently brought an echo frame, forks , middleburn crank and more a few days ago so only have about £50 to spend. I have a long arm xt derailor , 7 sp xt cassette and a 7 sp grip shift type 'sach' shifter. All this does not work and like i said i have £50 to spend. I was thinking of getting a single speed conversion because i can get a surley singulator tensioner for £5 off a mate but im not sure whether people use single speed on trials bikes or just tryig to buy a short arm derailor and new shifter and keep my gears. What shall ido? Please help, Luke :)