Niner Bikes NZ - Running the new SIR 9 with the Boost RDO MTB Fork: "The SIR was designed around a 120mm suspension fork resulting in a 68 degree head tube angle.
Best Rigid Mountain Bike Forks: Side-by-Side Comparison and Buyer's Guide - Exploring Wild
Niner RLT9 Steel now travels w/ flat mount disc brakes; Plus new Boost RDO carbon fork & longer RKT - Bikerumor
Freewheeler - Niner's new Boost RDO Carbon Fork - You can now run their imfamous fork on boost 110mm bikes. Perfect way to lighten up a plus bike! | Facebook
Going Rigid: 10 Rigid fork Options for the Ultimate Flatbar MTB Gravel Bike Conversion