For sale is a Clincher quick change gear set #4Q which is the same a set 4A.  This is an 18 and 23 tooth set that in a 4.11 ratio rear end yields a final ratio of 5.26 and in a 4.86 ring and pinion rear end yields a final ratio of 6.21.  Little used and in excellent condition.  Thanks for looking and as always I combine shipping when possible.