SLR Shimano. From: £3,600.00

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.

CUSTOM MASON X DEDACCIAI TUBING: ZERO/ZERO UNO

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

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.

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.

Hourglass Stays

We tried many shapes before settling on this one, the wall thickness tapers from top to base and the perfect ‘hourglass’ profile gives a sublime, smooth ride with the added spring of steel keeping things lively. We add a custom bend at the base to work with the disc-rotor and calliper.

F-Stop Axle System

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.

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. 

Thru-Axle Front & Rear

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.