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There are pros and cons to switching to 180mm cranks. There is no shame in a compact crankset, and there is in fact weight loss in the build. But a quality 180mm crankset with longer crank arms is a plus. Be glad to switch to 180mm cranks! Converted a Bontrager Race Lite 175mm 52/42/30 to the new Shimano Dur-Ace 7800 53/39 exo-bearing b.b. with 180mm crank arms and I am pleased with the results. It took a little getting used to feel-wise, but now I can more effectively use my long legs and can power up those hills better! Mixing Italian shifters/derailleurs/brakes with a Japanese drivetrain - had an American drive-train on before, so what's the diff? Got an incredible deal on 180mm cranks off eBay (basically got the bottom bracket for free) and the 2005 Dura-Ace 7800 is by far the lightest and stiffest crankset out there. My mechanic says that the new external bearing bottom brackets are a mechanic's best friend as far as maintenance and they are very strong, which is important to a big rider. If you have a 38 inch and run 177.5 mm Dura Ace cranks with a full Campy record drivetrain, consider 180mm cranksets. Used 180's but my other road bikes are 175's and I wanted to keep them consistent. You can use 180's on a single speed mtn bike though. Believe the difference when you switch to 180 mm cranks (just ilke you I went DA10 180mm cranks). 175mm happens to be the standard crank arm length for a medium mountain bike. Starting in the 1980s, there was a movement toward "low profile" cranks. With a low profile crank, the pedal ends of the arms stay in the same place, but the axle is shortened, and the arms run at an angle, outward from the bottom bracket and then toward the pedal end. Low profile cranks save a bit of weight, and are also potentially stiffer. The 180mm crankset design is a real benefit to riders who have a splay-footed (toes out) pedaling style, because they avoid interference between the rider's heels/ankles and the crank. Some people are not into low profile cranks because they blame the design for the wider tread seen on newer cranks, but that's not an accurate anlysis. The wider tread came first, for reasons mentioned above.