No drama just a quick guide to install the new Oneup 11 spd XT/XTR 45 tooth cog extender kit. Requires some basic shop knowledge. There's ~12 % improvement in range. Dropped 2.5 lbs off the bike with the OneUp 30t front chain ring. https://www.google.com/url?sa=t&rct...LWMVV5CwK92JqQdg4xQLpw&bvm=bv.116274245,d.dmo Tools/Materials: Chain whip (1) Shop Towel (1) Grease (1) Cassette lock-ring removal tool (1) Time: ~12 min. Steps: 1. Remove cassette using chain whip and cassette lock ring removal removal tool. Use a shop towel to protect the cassette from the chain whip tool. 2. Remove the XT/XTR cassette. Clean hub and cassette. 3. Leave the washer that was previously installed on the hub (if present). Install OneUp 45 t cog first (Photo 2) and the stock 40 t cog next along with the next set of cogs. 4. Put aside the stock CT/XTR 17 & 19 t cog (Photo 2) and replace with OneUp 18t cog (Photo 4). 5. Reinstall the rest of the cogs and cassette lock ring (Photo 5) and rear wheel. Your are done (Photo 7). Congrats.