Originally Posted by oilman_15106
Rebuilding/upgrading a Centurion, no snide remarks I have already been trashed on Road Bikes, & having problem converting the Suntour downtube 12 speed shifter to a more modern 24 speed setup. The frame boss is on the top for the Suntour. LBS did not have a solution short of making a part to accept the new shifters. I do not want to drill the frame! Any ideas will be appreciated.
Also, can you convert a 1" threaded fork setup to a threadless fork. If so how do you go about it?
Thanks.
Ya you can make it threadless with a new fork,HS and stem. Your problem will be the centurion probably used a JIS HS rather than the ISO in current common usage. JIS cups are 30.0 rather than 30.2 of ISO. Crown race difference doesn't matter since you are ditching fork. There are no lack of clamp on down tube friction shifters. Finding a clamp on on for a Shimano or other index down tube is a much tougher job. Alternate solution is barends or sti shifters and a clamp on downtube cable stop.