MRP - You asked for it - Better Boost Adapter Kits for Chris King hubs are ready! These feature precisely-made, but simple to install, press-fit end caps that add 5mm to each
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MRP Better Boost Hub Conversion Kits – Mountain Racing Products
Amazon.com : MRP Better Boost Endcap Kit - Converts 15mm x 100mm to Boost 15mm x : Sports & Outdoors
Mrp Dt-Swiss Better Boost Adapter Kits | Jenson USA