ZTTO Bicycle Internal Cable Routing Headset

High-Quality Construction
Crafted from precision CNC-machined 6061 aluminum alloy, this headset features chromoly steel sealed bearings for long-lasting durability and smooth steering performance.

Internal Cable Routing Design
Equipped with 4 integrated cable ports (2 x 4mm, 2 x 5mm), allowing neat and effective internal routing for brake hoses, shift cables, or e-bike wiring. The entry angle of approx. 30° ensures a smoother cable curve and reduced drag.

Compatibility & Size Options
Compatible with tapered forks (1 1/8" – 1 1/2") and offered in multiple SHIS configurations:
N5252ST: IS52/28.6, IS52/40 (with 30 adapter)
N5256ST: IS52/28.6, ZS56/40 (with 30 adapter)
N5656ST: ZS56/28.6, ZS56/40 (with 30 adapter)

Technical Specs
Material: 6061 Aluminum Alloy
Bearings: 45°/45° Sealed, Size 52x40x7mm
Weight: N5252ST ≈ 110g / N5656ST ≈ 140g
Fork Compatibility: 1-1/8" to 1-1/2" tapered

Adjustable Compression Rings
Includes 3 compression rings in different thicknesses (6.5mm / 7.5mm / 8.5mm) for precise adjustment and a perfect frame-crown gap fit. Also comes with 0.3mm and 0.5mm shims to fine-tune stack height by ±0.7mm.

Important Installation Note
If your frame uses a ZS56 interface, the headset uses bearing cups directly and does not require a compression ring. Always measure the depth of your frame's bearing seat before installation to select the correct compression ring thickness. Refer to the diagram in the product images for detailed guidance.

Ideal For
Cyclists looking to integrate clean internal cable routing into their frame and fork setup without compromising on performance, adjustability, or ease of installation.