Gearing is torgue multiplication,so it takes what the engine makes and adds or subtracts (if u change from what u already got) to the rear tire. So if u want tire spinning/smokin,front tire in the air,grip it and rip it torgue (in theory lol) out of ur bike do the 26t,no one makes a 25 or 24,i asked! would need to change rear sprocket for more,,i only care about leavin a stop light as fast as possable sideways so thats what i did.Billy G. once said he makes his (small inch) engines believe there bigger then what they are and thats why they run so fast(quick).in a small way this is what goin from a 28 to a 26t gear would do,makes what u (1130/1250) got seem bigger (more torgue)