Bokeh Ti Shimano. From: £5,250.00

T47

This frame features a 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.

EN Tested

All our frames and forks complete the brutal strength and fatigue testing to comply fully with EN regulations. They are pushed, pulled, dropped and twisted over 100,000 times and must survive without any damage before they can pass.

It's not law that frames and forks have to be tested to their limits like this, but our frames will always be tested in this way, so you can be sure that your MASON frame not only looks beautiful with a ride quality to match, but it is tough, safe and dependable too.

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.

Taper Head Tubes

Our frames use modern 1-1/8” - 1.5” taper head tubes. Pioneered by composite frames, the taper head tube makes huge sense for metal frames too;

The large overall diameter provides a useful weld area. The fully integrated headset is light and has a very low stack-height. Large 1.5” lower bearing, mated to a tapered carbon fork steerer, spreads the load and gives flex-free braking and instant response to steering input.

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.

Integrated Headset

Integrated, 41.8ø upper, 51.8ø lower, for taper head tube. Both bearings are ‘ACB’, meaning ‘Angular Contact Bearings’. The head-tube seat angle is 45º.

The headset drops into a tapered seat in the head tube and is tensioned using a headset tensioner within the fork steerer. Tensioning the headset centres it on the taper and prevents any play. The larger lower bearing allows a tapered steerer and larger crown. This gives sharper response, helps reduce flex under braking and spreads bearing load.

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.

D-Form Downtube

The DForm down tube is designed by us and tooled exclusively for MASON by Dedacciai in Italy. It is not a simple ‘D’ section and varies in shape from being taller/narrower at the head tube to being wider and lower in section where it meets the BB shell. This shape allows a very wide weld where the tube meets the BB, giving it great stability and ensuring that the weld doesn’t excessively overlap onto the base of the seat tube.

Custom Tubeset

We choose each tube individually, considering the influence that it will have on ride quality and overall performance. We will use a blend of tubing types, custom shapes and bends to help us achieve this goal.

Modern metal frames draw on many of the design influences learnt from composite frames, such as oversized BB’s, taper head tubes and switchable internal routing. Teamed with our properly designed carbon-monocoque forks, the contemporary Aluminium, steel or Titanium frame is a formidable piece of kit.

Structural Surface Finish

Re-Machinable Bearing Seats

QuadSlot Seat Tube

MASON x Dedacciai Ti Tubing

Our BokehTi, Aspect and Aspect Integrale use a full compliment of custom 3AL-2.5V/GR9 seamless tubing. Every tube is designed or shaped specifically for MASON, nothing is ‘Off the shelf’. Dedacciai tooled up for our special ‘Dform’ down tube and all other tubes have bends and profiles developed between MASON, Dedacciai and our frame makers in Italy. THIS is the key to the superb, ‘grin inducing’ ride of these award winning bikes.

UDH Equipped

This frame is equipped with the 'UDH' [Universal Derailleur Hanger]. The 'Universal Hanger' standardises the shape and fixed position of the hanger across the industry and is compatible with all modern rear mech types from all major brands.

Our UDH dropouts are compatible with all SRAM 'T-Type/Transmission' rear mech models, and any future rear mechs and gearing systems that are designed to work with the UDH standard.

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.

8 FRAME SIZES

8 frame size options are unusual for a small bicycle company like ours. We believe that a large size range helps to guarantee an optimised fit, essential for long-distance comfort and efficiency. 48cm through to 62cm, the geometry and clearances vary throughout the size range, meaning that there will be a MASON to fit you perfectly.

DEDICATED DYNAMO ROUTING

We often fit modern dynamo lighting and charging systems to our builds, so we have added dedicated dynamo cable routing ports to the top tube, using the space freed up by refining the cable routing. This important feature means that the cable is more easily routed between front and rear lights and gives alternative mounting points, either at the seatclamp or dropout, depending on rack and bag setup and requirements.

6x Bottle / Accessory Mounts

The InSearchOf is designed to travel, so all ISO framesets have a full compliment of bottle and accessory mounts. We do not reduce the number of mounting points with smaller frames.
There are 2 x bottle/accessory mounts on the HotShoe fork + the TriMount for the Mason Shutter load-bearing mudguard and Condenser rack system.
The frame has 3 x bottle/accessory mounts. The smallest [42cm] size has an extra boss on the down tube which allows greater adjustability to make space for extra bottle on seat tube or a larger frame-bag on the top tube.

RangeFinder•AR

We have developed the entirely new ‘RangeFinder•AR’ fork which is custom tuned for the SLR models. Featuring pannier & ‘rando’ style rack mounts, Ø12mm Thru-axle, 160/180mm flat-mount, and 700C x 40mm tyre clearance (with a 52mm fender) which is ideal for grand-touring duties. The carbon lay-up of the SLR fork has been optimised for this frame’s usage, delivering a super-smooth riding experience on variable and firmer surfaces. 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.