I'm currently swapping out the Ultegra 6500 groupset on my '92/93 Orange Dynamo for a more period correct 6400 600 "Tricolor" group, and I'm having issues with the downtube shifters.
The 6500 group currently has 9-speed "brifters" and cable stops on the downtube mounts.
Firstly, I can't seem to get the silver backing plates off the studs.
Secondly, if I do get the backing plates off, the ones from the 600 shifters won't fit the tube profile of the aluminium frame (they came from a steel framed donor bike).
Lastly, the 600 shifters won't fit on the current backing plates as they're of a different design.
So... As I'm pretty sure they didn't make 6500 downtube shifters, what are my options? Is there something that will fit & work with the 600 drivetrain? Any tips for removing the backing plates? I assume they DO come off?
The 6500 group currently has 9-speed "brifters" and cable stops on the downtube mounts.
Firstly, I can't seem to get the silver backing plates off the studs.
Secondly, if I do get the backing plates off, the ones from the 600 shifters won't fit the tube profile of the aluminium frame (they came from a steel framed donor bike).
Lastly, the 600 shifters won't fit on the current backing plates as they're of a different design.
So... As I'm pretty sure they didn't make 6500 downtube shifters, what are my options? Is there something that will fit & work with the 600 drivetrain? Any tips for removing the backing plates? I assume they DO come off?
![IMG_20231226_153102.jpg IMG_20231226_153102.jpg](https://www.retrobike.co.uk/data/attachments/647/647353-a9a89ae782a037fa378e19347767e79c.jpg)
![IMG_20231226_152727.jpg IMG_20231226_152727.jpg](https://www.retrobike.co.uk/data/attachments/647/647354-d6fb38ee1f5d2c380a154f85dd87cb57.jpg)
![IMG_20231226_152836.jpg IMG_20231226_152836.jpg](https://www.retrobike.co.uk/data/attachments/647/647355-5c94db1448fb71308e3b2b3c0438bfa5.jpg)
![IMG_20231226_152909.jpg IMG_20231226_152909.jpg](https://www.retrobike.co.uk/data/attachments/647/647356-e4679491a7fc8e7989a50e080f6f21f2.jpg)