Exposure GRX Di2 £4,850.00

44MM HEADSET

A straight 44mm internal diameter head tube uses the EC44/ZS44 press fit headset standard which allows compatibility with all current fork steerer tube standards as well as angle adjust headsets.

44mm RING-REINFORCED HEAD TUBES

This frameset features a UK made Reynolds 631 head tube, CNC-machined by BEAR Frame Supplies.

The large overall diameter provides a useful weld area, with ‘Ring-Reinforcement’ top and bottom for strength and tapering down in the middle to reduce weight.

Custom Mason X Dedacciai Tubing: ZERO

Almost the entire tubeset was developed in conjunction with Italian tube gurus Dedacciai, using their new 'ZERO', fine grain, micro-alloyed, progressive butted steel tubing. We work very closely with them to develop our Alu, Ti and steel tubesets for Bokeh, BokehTi, Definition, ISO, RAW and Exposure models.

Mason X Barco

MASON is renowned for designing and producing award-winning bicycle frames in conjunction with the world’s finest frame builders, drawing on their expertise to create a finely tuned bicycle from both manufacturing and riding perspectives. This model is fabricated in Italy by our friends at Cicli Barco. Like MASON, they are a family business and are amongst the most highly skilled frame fabricators in the world, renowned in the global frame building industry. What has brought us together with Cicli Barco is their highly personal approach to frame building and business, backed up by perfect fabrication.

Multiport

Our frames use an adaptable, internal cable routing system. Developed by us to allow your Mason frame to be used with a combination of control systems and adapt and evolve with your requirements and riding styles. We were the first to bring this type of system to a performance steel frame and now use this system across our range. Interchangeable alloy parts allow five options:

1. Full cable outer. 2. Hydraulic Hose. 3. Split outer. 4. Electronic cable [e.g. Shimano Di2]. 5. 2 x Hose/cable or Hose/Dynamo wire 6. Blank.

F-Stop Axle System

27.2 Seat Post

Our oversize seat tubes don't house oversize seat posts. The large diameter seat tube helps the 'core-stability' of the frame but large, stiff seat posts don't help rider comfort. A 27.2mm post helps to dial out road-buzz and the smoother ride means you stay fresher for longer.

Disc Brakes

This frame is designed for disc brakes. They work consistently in all conditions, pull up quicker in the wet, they don't grind your expensive rims into black sludge and in my experience they change the whole riding experience for the better, especially when coupled with modern disc-specific wheels and high-volume tyres. You’ll find yourself riding in a more confident, controlled, fluid and ultimately more efficient way.

Internal Routing

We route the hoses and cables internally where practical, keeping the 'adventure nature' of our bicycles firmly in mind. For smoother runs and a cleaner aesthetic, all control cables, hoses and electronic shift control wires now run through the down tube, via the special BB shell and out through the chainstays, guided by our Mason 'MultiPort' adaptable inserts. Interchangeable Internal routing keeps the control cabling away from road dirt and grime, helps avoid accidental damage, makes cleaning easy, de-clutters your bike and means you can adapt your bike easily to work with various shifting and braking methods. For adventure and endurance riding, internal routing also has the advantage that it is easy to strap frame packs to the frame tubes without being hindered by external cabling and hoses.

T47

This frame features a stainless-steel T47 BB Shell which allows the brake hose and gear cables to be 100% internally routed through the frame tubing and exit through the chainstays to the rear mech and flat-mount brake caliper.

650B/700C

The Bokeh and Exposure are optimised for large-volume treaded tyres, and are designed for 650B and 700C wheel sizes. Using the smaller 650B wheel means that you can fit a larger-volume treaded tyre for off-road applications, or use a 700C wheel with a tyre of less volume, but with the same rolling radius, when prioritising rolling speed.

We've worked together with HUNT Bike Wheels to develop the tubeless-ready, extra-wide, 650B 'AdventureSport' wheelset: replaceable cartridge bearings; traditional J-bend spokes; easy strip down of the hub system requiring traditional tools only.

Bottle #3

A third bottle cage mount at the base of the down-tube to allow for an additional bottle or tool keg to be fitted. The third bosses are positioned close to the BB to maximise tyre clearance and keep the centre of gravity low. 

Switchlever

This model uses SwitchLever Thru-Axles front and rear. This high quality axle system features a removable lever to be used with both axles. Store the lever in the front axle for quick use or remove completely for extra security and a clean, low-profile look.

8x Bottle / Accessory Mounts

The Exposure is designed for long-distance and multi-month adventure touring, so all Exposure framesets have a plethora of bottle and accessory mounts. There are 2 x bottle/accessory mounts on the RangeFinder AS fork, as well as traditional pannier rack mounts.
Standard frame mount bosses: x4 down tube (top side); x3 down tube (underneath); x3 seat tube; x2 top tube for securing a top tube pack; x2 seat stays (both sides). Designed for maximum adaptability and adjustment when using larger or full-frame bags.

RangeFinder•AS

We have developed and tooled for the entirely new ‘RangeFinder•AS’ fork which is custom-tuned for the Exposure and Bokeh3 models. Featuring pannier & ‘rando’ style rack mounts, triple ‘anything-cage’ style accessory mounts, Ø12mm Thru-axle, 160/180mm flat-mount, and huge 27.5 x 2.35” | 700C x 50mm (with a 62mm fender) tyre clearance. The carbon lay-up of this fork has been optimised for this frame’s usage. Additionally featuring sealed internal brake and dynamo light cable routing and our unique Mason 'F-Stop' axle system, with Mason developed SwitchLever axle and replaceable fork inserts.