Joined: Feb 2006
Posts: 12,286
Likes: 317
From: Lake Geneva, WI
Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2
If you are using a MTB rear derailleur, you should be ok at the rear. The chain wrap required is 2 units greater on the touring drivetrain, but should work. Check the chain on the big-big combination to see if the chain is long enough.
The front derailleur will need to repositioned and adjusted. Changing over will take some time and effort.
Assuming that these are 3x9 or 3x8 drivetrains, I would use one crank. A Shimano Tiagra 4503 can take a 26 or even a 24 small chainring. This will provide a 50, 39 & 26 (or 24) chainring set. You could sell the two cranksets and the extra derailleur and be $$ ahead.
http://www.google.com/products/catal...d=0CGcQ8gIwBA#
and
http://www.google.com/products/catal...d=0CDQQ8wIwBA#
or
http://www.google.com/search?tbm=sho...l0l77l77l1l1l0
__________________
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
Last edited by Barrettscv; 02-28-12 at 12:06 PM.