Geiles Teil 4.0 stem

Tune Stem Geiles Teil 4.0 – light, precise and seriously good-looking. Its conical shape, both inside and out, follows the load path precisely and provides excellent stiffness and stability where it is needed most.

Designed for road, gravel and XC-MTB use, the Geiles Teil 4.0 is compatible exclusively with 1 1/8" fork steerers and 31.8mm handlebars, whether carbon or aluminium. This makes it the ideal choice for modern lightweight cockpit setups where precision, low weight and clean design matter.

Add some colour to your cockpit: the Geiles Teil 4.0 is available in all Tune anodized colours, allowing you to match it perfectly with the rest of your build.

Installation note: The stem can technically be flipped. However, the laser marking is aligned for the downward position with negative angle — that is how it looks best.

Technical data

Material: Aluminium, shaft and front plate
Screws: M5 titanium screws, 2x 13mm length and 4x 14.5mm length
Manufacturing: CNC-turned and CNC-milled
Angle: ±8°
Height: 40mm
Length: 50 / 60 / 75 / 85 / 95 / 110 / 120mm
Handlebar clamping diameter: 31.8mm only
Fork steerer compatibility: 1 1/8" only
Weight: 50mm / 95.5g, 60mm / 101.5g, 75mm / 109g, 85mm / 115g, 95mm / 121g, 110mm / 128g, 120mm / 131.5g
Field of use: Road, Gravel, MTB-XC
Max. rider weight: 100kg