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Which 105 is it - 5600, 5700 or 5800?
5700 and 5800 have the longer new Super SLR cable pull and so will work with mini-Vs (I'm running 5700 levers with 90mm TRP CX9 brakes and they're great). 5600 don't have the longer pull and need shorter arms (<84mm). If you're running 5700/5800 with the shorter arms then you might have insufficient mechanical advantage and it'll feel underpowered.Do the rims have machined sidewalls? If there's anodising then it'll brake like wank.
Anyone else got any advice on the above. Struggling to find a good solution.