Headset Crown Base Ring Compatible with Tapered Fork and Headset Compatible with MTB

Headset base ring, compatible with tapered forks and headset systems for mountain, road, and hybrid bikes; fits 29.8mm inner and 39.8mm outer diameters.
Precision-machined aluminum alloy for smooth steering; helps center the lower bearing, reduces play and noise; corrosion-resistant silver finish, easy to clean after wet use.
Taper fork conversion: allows replacement or upgrade when swapping forks, frames, or headsets; restores correct support geometry and improves contact between the steerer tube, crown, and lower bearing.
Dimensions: 29.8mm inner, 39.8mm outer; thickness suitable for 40mm lower bearings; installs with a crown crimping tool or soft mallet; press-fit mount for even support around the crown.
Bike service scenarios: for home mechanics and shops, trail, commuting, gravel, touring, and city riding. ensures consistent steering after headset overhauls, fork upgrades or frame renovations.