In my opinion, this is a fascinating topic! A reduction in unsprung weight and rotational mass will make a big difference on your bike by making it more nimble and giving a small bump in horsepower! In these two videos, I am documenting the process of replacing a 520 chain and sprockets with a lighter 415 size. I am also replacing the mounting studs for the rear sprocket with 8mm shorter Titanium studs. This will simplify the process of swapping wheels at the racetrack since the studs won’t be protruding as much and, therefore, less likely to get caught in the chain. While doing this work, I’ll also replaced the rear disc rotor with a Galfer Wave.  In the 2nd video, I had to deal with some challenges when shortening the 415 chain. I will publish another episode in the next few weeks talking about a new chain tool specifically for this chain size.   The total weight savings are considerable.  Here is the full list:  Item  OEM Weight  New component  Weight Reduction   520 chain vs. 415  1633g  971g  662g  Front Sprocket  184g  139g …