Bash guard for 3x to 2x conversion

thingiverse

To swap your 3-speed crankshaft for a 2-speed model, you'll need to attach a washer to secure the ex-middle, now top ring. I opted not to use washers and instead created a straightforward bash guard. You can replace the largest chain ring with this guard and be done. This bash guard was designed specifically for my Shimano Deore crankshaft (FC-M542). However, its inner dimensions are based on the outer dimensions of the chain ring, so it may fit other crankshafts as well. The chain ring size is 36T.