Enduro

HDK-0013 Drop-In Headset Kit - IS41/28.6 Upper | IS52/40 Lower - 36x45 - Tapered

Enduro HDK-0013 Drop-In Headset Kit is a precision integrated (IS) headset designed for frames using an IS41/28.6 upper and IS52/40 lower with a tapered 1-1/8" to 1-1/2" steerer. Built around Enduro’s angular contact bearing design and high-grade materials, it’s a durability-focused choice for riders who want smooth steering feel and strong sealing in wet, gritty conditions.

This IS41/IS52 integrated/drop-in headset uses 36°/45° (36x45) chamfers and premium bearing construction—440C balls and races plus a 90% fill of high-pressure waterproof grease—to keep contamination out and performance consistent between services. Enduro bearings in this kit are guaranteed for as long as the rider owns the bike.

• IS41/IS52 tapered compatibility - Fits head tubes with 41mm top ID and 52mm bottom ID for common integrated tapered setups (1-1/8" to 1-1/2")
• Angular contact bearings (36x45) - Designed to handle the combined radial and axial loads a headset sees under braking and cornering
• 440C balls and races - Corrosion-resistant, wear-focused materials chosen for long service life in real-world riding conditions
• Dual-lip sealing + 90% waterproof grease fill - Helps block water and grit while maintaining smooth rotation over time
• Complete drop-in kit hardware - Includes upper bearing cap, hidden bolt topcap preload adjuster, 36° crown race, and compression ring for a clean, integrated build
• Bearing specifications - Upper: ACB 3645 SS (30.2mm ID / 41mm OD / 6.5mm W); Lower: ACB 6808 SS (40mm ID / 52mm OD / 6.5mm W)