Originally Posted by
Eddie50
If I am understanding it correctly you converted it to right side drive using the outer (normally where the 52 goes) as the timing ring?
Using a 36 as the granny and 36 too as tining? and what did you use as front crank?
Used 42 as the timing ring, not 36.
Front I used an Ultegra 6600 double, removed the 53/39 rings and mounted the 42 timing ring in the outer position with a 5mm spacer to get a slightly straighter chainline.
Overall the drivetrain changes to full 2x11 and one less timing spider saved me 396g. All I had to purchase was the 74 bcd 36T ring for $55 plus postage and local duties and 3 11 speed chains. The Shimano Ultegra cranks were lying around in the parts bin. Being a hoarder paid off for this project.
One problem with the Ultegra 6603 was the Q factor was not quite wide enough for the tandem frame so I machined an 8mm axle extension that bolted inside the axle.