ok thanks im not an actual dirt bike rider but just want it fixed up as it is a bit broke with no front brake broken front gears. so i want it to be ok for when i do ride it on the dirt track like for just jumping and if i go single speed how would it cost as at the moment i am running 21 sp but i was planning to juts run a 7 sp whilehaving the middle burn chainring (middle) and my cassette. also what if i was to go single speed what type of ratio should i have. and also what stuff extra would i have to buy for going single speed etc like a new hub or anything like that.. thanks toby