yeah talk to the bike store guy. have him try it out on a full stop and see what he thinks.
Have him check the rims, too.
ps. yes, there are differences. I found the cheaper 105 on our rental bikes more "aggressive" than my ultegra or previous campy. they bite, but you can't "dose" as subtly. But that should not be your problem as you're saying they don't bite at all?



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