I recently read the following thread about a crankset setup and am looking for some further advice for my specific goal of building an electric assist commuting bike (Bionx system) with three chainrings and a 7 speed Shimano freewheel. http://www.bikeforums.net/archive/in.../t-377250.html
The thread discusses a 52/42/26 crankset. I would like to use a similar crankset with a 13 - 15 - 17 - 19 - 21 - 24 - 28 7 speed freewheel on a Surly Long Haul Trucker frame that I intend to build up. (The link to the frame specifications for the Surly is http://www.surlybikes.com/longhaul.html )
Here are some of my questions:
1) Can a Sugino XD300 or XD600 crankset be setup to use 52/42/26 chainrings? If not, can someone please recommend a brand/model suitable for the Surly frame?
2) What front and rear derailleurs would work for this setup?
3) What shifter should I use (mounted to a flat handlebar)? (would a downtube shifter be more appropriate?)