The HollowTech-II standard has been with us for many, many years, and encompasses every top-tier crank system Shimano produces from Dura Ace to Deore, XT. The beauty is that all HollowTech-II systems feature a 24mm spindle, be they road or MTB spec, and so we are offered the ability to swap our HollowTech-II for HollowTech-II cranks without compatibility issues within reason. Let's hear what some of those compatibilities are right now.
We get questioned a lot about Shimano cranks "Hey I have a Dura-Ace crank what bottom bracket should I buy." "I have a 105 crank." What matters is what standard it is this is a HollowTech-II crank standard now Shimano has been running this HollowTech-II standard on their road and mountain bike cranks for about 15 years. Their real low end cranks are still like three p square taper and all that I'm not talking about those I'm only talking about the HollowTech-II style which is going to be like Tiagra all the way up to Dura-Ace and then XT, XTR, DIORE all that and once again if you have a HollowTech-II road crank set it will fit in any HollowTech-II bottom bracket including any of our direct fit Shimano if it's from us and it says direct fit Shimano it works with HollowTech-II. now this once again applies for mountain bikes if it's a newer like HollowTech-II style mountain bike crankset it will fit in any of our direct fit Shimano mountain bike crank sets you cannot put a HollowTech-II road crank in a mountain bike and the other way around you could put a mountain bike one in a road crate but you'd have to put spacers on but you absolutely cannot put a road crank in a mountain bike unless it had a 68mm shell let's not get into that right now but what matters is, is it HollowTech-II or not
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