I have a Cannondale which runs 105 sti 10 speed, it is about 4 years old. Last month the left hand STI lever failed and I took the bike into a bikeshop in Berlin, where I live. I collected it the next day and it was sporting a new lever saying simply "Shimano Flightdeck" It has worked OK until today, when the chain started to come off from small ring to big, it looks like a triple changer has been fitted.
My German is not brilliant, I am going back to the shop tomorrow, but I would like to know whether I have been charged for a 105 unit, and have been fitted with some old piece of kit that they have had hanging around for ages.
I am also surprised that the unit failed, my other bike also runs 105, is 12 years old and has done loads more miles and I have just replaced the cables!