Bos updates downhill offerings with new Obsys fork, Syors shock and updated Dhyos fork

A resurgence from the dh legends

Bos has unveiled the Obsys downhill fork and the Syors shock at Eurobike as well as revealing the dhyos fork (an updated BOS Idylle).

Bos Obsys downhill fork

Bos is wearing its motorbike history on its sleeve with the new inverted Obsys fork. Looking at this thing you realise it’s a true brute. The 42mm stanchions and even thicker tubes make it the meatiest fork on the market and the oversized crowns only add to the aesthetic.

The reason for all this reinforcement is torsional stiffness, something Bos is claiming is lacking on other inverted forks such as the Manitou Dorado or the DVO. Bos is claiming that despite being inverted, the Obsys is up there with the stiffest on the market, including the Fox 40.

The fork is 220mm travel with a 200mm, 29 inch version also available. The fork will come with 2 different steerer tubes that allow you to set the offset between 53 and 59mm.

The damper is an improved FCV damper that was tested by the Polygon UR team for a whole year on the World Cup circuit when they were still on Bos. It’s smaller and comes with new bushings and seals.

As for tuning, Bos are surprisingly ungenerous. Their philosophy is that they’ve perfected the spring curve and don’t want you to be able to mess with it by allowing for adjustment of the negative chamber. The two valves on top are for air pressure and pre-load only.

This looks like a brute of a fork and we can’t wait to get some laps into it. The downside? The weight is above the three kilogram mark. We’ll be putting some runs in to see how much of a difference this makes soon.

Bos Syros shock

The Syors is Bos’s first metric coil shock. It’s got everything you’d expect from a modern gravity shock – trunnion mounts, high speed/low speed compression and lightweight springs.

However, on bit of tech that stood out for us was the Kick Valve – this is a special, non-tunable compression setting that aims to take the sting out of very high speed compressions (e.g you’re speeding down a fireroad and hit a rock).

Bos Dhyos fork

The Dhyos is basically an update on the old Idylle (a firm favourite here at Dirt). There are new stanchions, bushings and seals and the damper is the updated FCV that’s also in the Obsys.

We’ll be getting some runs on the new BOS kit on their home trails in a few weeks. Keep it tuned to Dirt for a full report.


Newsletter Terms & Conditions

Please enter your email so we can keep you updated with news, features and the latest offers. If you are not interested you can unsubscribe at any time. We will never sell your data and you'll only get messages from us and our partners whose products and services we think you'll enjoy.

Read our full Privacy Policy as well as Terms & Conditions.