IS52 Headset for Semi-Internal Routing

Built for riders who prefer the flexibility of semi-internal (under the stem) routing, our Headsets for Semi-Internal Routing were developed for frames using an IS52 headset. These headsets are equipped with a custom seal at the cable entry ports that eliminates contamination from moisture and debris, maximizing bearing life.

[FEATURES]

• Designed for semi-internal cable routing to allow the use of standard 1-1/8" stems and headset spacers with bikes that use an IS52 upper/lower headset and a 1-1/8" to 1.5" tapered steerer tube.
• Only compatible with frames designed for through-the-headset routing.
• Custom cable entry port seals eliminate moisture and debris contamination, maximizing bearing life.
• Use the compression plug that comes with your fork.
• Sold as a complete upper and lower IS52 Headset.

Specs:

• TYPE: IS52, Semi-Internal Routing
• BEARINGS: Upper & Lower Oversize Cartridge Bearings, SUJ2 Steel, 45° x 45° Angular Contact
• TOP COVER: CNC-Machined Alloy, Pre-Drilled for Internal Cable Routing
• CROWN RACE: CNC-Machined Alloy
• STACK HEIGHT: 10.7mm ±1mm
• HEAD TUBE FIT: 52mm ID / 56mm OD
• BEARING OD: 51.8mm
• CROWN RACE BORE: 39.8mm or 30mm (steerer-dependent)
• STEERER: 1-1/8" to 1.5" Tapered

Includes:

• Upper & Lower Cartridge Bearings
• 2x Port Hole Covers — for 1x and electronic builds running fewer than 4 routing lines
• Nylon Compression Ring with Cable Routing Hole
• Nylon + Fiber Spacer (adds clearance height for smoother rotation)
• Custom-Sealed Cable Entry Ports
• Compression Plug included

Compatibility Notes:

• Compatible with the Carbon All-Road v2 and Carbon Road and most IS52 bicycles