I have a white industries ENO rear hub which allows me to ride a fixed gear on my vertical drop out road frame. I want to switch to a single speed freewheel (hub is a free/fixed flip flop). The Eno hub allows me to pivot the hub in the rear forks but if i have a freewheel I should (evenin' officer) have a rear brake...but the pivoting of the rear hub means that the calipers won't reach the rim. anyone had similar issues or know of long reach calipers? Alternatively could anyone suggest a singlespeed rear hub/wheel build which would sit "normally" vertical dropout road frame which I could use with a chain tensioner? merci!