On-One's slackset fits any of our Smoothie Mixer compatible frames to slacken the head angle by about 1.5degs, giving stabler handling at speed. Also, because of it's internal lower cup, this headset will steepen your seat angle for better climing, lower your standover height and make the bike handle with much more stability at higher speeds.

The headset is designed to fit the Smoothie Mixer standard size head tube - 44mm upper, 49.6mm lower. Upper cup is now external to allow the offset for the angle adjustment, but the total steerer length is practically identical. Headtube length is 90mm (16in), 105mm (18in), 120mm (20in).

The headset kit contains all parts and completely replaces your current headset.

Instructions are provided here

Note:- This model will only work with straight, NOT tapered steerer forks. A taper steerer model is in development.