Ok so 1/ First of all after spending alot of time setting up my brakes each time I take my back wheel off or when it starts rubbing i was wondering if it would be possible to make a small chain tensioner that would be blocked using the axel and snail cam bolt ? If yes would they be any big disavantage 2/ I was thinking about getting and rear freewheel as a profile or chris king. But is there any advantages of having the freewheel on the rear ? Disavantages ? Is it much heavyer ? Thanks