One of my bikes, an older Giant OCR, features flat bars, 8 speed rear and an older 105 seires crank with 53/39 double on the front. The bottom bracket and the front derailer were changed for the double setup.
I am currently shifting the front rings with a 3 speed left side grip. It works ok with lots of room for trimming and the high and low stops carefully set. I thought it would be neat to have a left side double grip shift and can't source one.
Has anyone ever seen one or have a source?