Originally Posted by
jsavage451
well kudos on finding that, i did not think sturmey archer would ever do that, good luck on your conversion!
Sturmey Archer also offers disc brake 3 and 5 speed hubs.
http://www.sturmey-archer.com/products/hubs/cid/4/id/60
http://www.sturmey-archer.com/products/hubs/cid/4/id/60
Although the 3 speed is for extra wide dropouts (170mm)
To the OP, drum brakes would be a much better option for that bike. No frame modification required.