Persist Optimus Crown/Stem review

Stiff & light upgrade for Fox 40 forks

Our rating 
3.8 out of 5 star rating 3.8
GBP £170.00 RRP
Persist Optimus Crown/Stem

Our review

An expensive, but beautifully made upgrade for Fox 40 forks
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Made from 7075 T6 aluminium, the Optimus integrated crown and stem is stiffer than the standard Fox upper crown, and is also slightly stiffer than other aftermarket crowns made from 6000 series aluminium.


The main advantages of having an integrated unit are that it will be lighter than using a separate stem and upper crown. It will also be lower with rider weight on the front end and, in turn, more traction. As well as this, your bars will stay facing forwards when you have an off.

The Persist crown is beautifully machined and has a burly look. Every bit of unnecessary material has been removed. On the front of the crown are twin 4mm titanium bolts to spread the torque load and reduce the chances of the crown slipping.

The stem separates from the crown, rather than being a one-piece design. It is mounted with twin 4mm titanium bolts, and a single bolt around the steerer tube – much like the Sunline 888 stem. Four 5mm bolts secure the clamping plate of the stem and more intricate machining keeps the weight down.


On the bike, the low stem height keeps everything up front nice and low as well as keeping it all tidy and clutter-free. 

Product Specifications


Name Optimus
Brand Persist

Description The stem separates from the crown, rather than being a one-piece design. Gold Titanium Cap-head socket screws as standard.
Colour Black
Material 7075 T6 Aluminium