Originally Posted by walshconor

So I recently got my old 105 components put on a new frame. Got back from the shop and put the bike on the trainer for a short ride. To my dismay when I shifted from the big ring to the small ring (while in one of the smallest rear cogs) the chain did not engage on the small ring teeth and instead just slid on top of them. This doesnt seem to happen when Im in a large cog in the rear. Did they put a 10 speed chain on my 9 speed bike? What going on?

Thanks for any help.