InSearchOf Frameset £1,595.00

InBoard Disc-Mount

The calliper is mounted on the chain stay, this allows us to use lighter more comfortable seat-stays and gives a flex free mounting for the post-mount components to be welded to. Mounting the brake on the chain stay also keeps it cleanly out of the way of rack and ‘guard stays.

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.

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.

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.

1x Drivetrain

'1x' is a multi-terrain performance drivetrain with maximum chain security thanks to the narrow-wide chainring and jockey wheels and 'clutched' rear-mech. The range of gears is equivalent to a 2x compact drivetrain, but with the elimination of doubled-up crossover gears. '1x' are lighter, quieter, and more secure.

FlatMount Brake Calipers

Flat mount disc-brake callipers are lighter, neater, and open up more space within the dropout area for racks and ‘guards. The calliper is mounted to the dropout, allowing us to use a lighter, more comfortable seat-stay.  Up front, the calliper is mounted directly to the fork [via the brake manufacturers adaptor] and offers a cleaner and more minimalist appearance and also provides a compact packaging of the brake caliper.

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.

Custom Tubeset ISO

For the ISO every tube has a custom profile, section or bend to work exactly how we want it for ride quality, clearance and durability.

Threaded BB

The ISO frames use high quality stainless steel 73mm, BSA, threaded BB’s. This gives greater durability and creak-free reliability over many miles. The threaded BB is easier to service using standard tools and you are more likely to find a replacement when adventuring far from home. A properly lubricated, threaded BB is also an ideal interface with a metal BB shell.

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.

Suspension-Ready

The InSearchOf geometry and tubing is designed and tested to accomodate a suspension fork. The custom down tube allows plenty of clearance for the crown.
Crown height is 483mm, equal to a typical 100mm travel XC fork with 20% sag. Please check your chosen suspension fork tech data before fitting to ensure that the travel is no more than this stated dimension. Using forks outside these dimensions will void warranty and could result in frame failure.
Forks with 51mm offset are recommended.

Dropper-Ready

A dropper is great for getting the saddle out of the way for steeper, rougher and more technical riding, especially with a loaded up bike.
The 31.6 post size allows the use of most modern dropper-posts. The seat tube has internal ‘stealth’ routing which can be blanked-off when not in use and there are specific eyelets for dropper cable routing on the down tube.

31.6 Seat Post

The Reynolds seat tube is Ø31.6 internally to be compatible with all popular dropper posts and our own Penta carbon seatposts.

27.5"/29"

The ISO is designed to work with both 27.5” [650b] and 29” [700c] MTB wheels and tyres, meaning this bike can be ridden over an extremely wide range of terrain. Recommended tyre sizes: 27.5 x 2.8” and 29 x 2.4”.

DForm Down Tube

We worked with Dedacciai to design and tool for the exclusive Mason ‘DForm’ down tube for the ISO frame. The special 'D-Section' shape where it meets the BB gives a flat wide weld for maximum stability at the pedalling platform and avoids excessive tube overlap onto the seat tube which can lead to fatigue failure.

HotShoe2 Carbon Fork

As with all our framesets, we design and tool for our own fork. Both the MASON ISO and Macro use our MASON HotShoe2 carbon fork. The refined shape maintains ride quality and feel and there are multiple mounting points for accessories, including our TriMount on the fork crown for ‘MASON Shutter’ load-bearing fender and 'MASON Condenser' rack. Internal routing for hose and dynamo wire and light mount on crown. Huge clearance for up to 29 x 2.6" tyres.
Fully tested to MTB standard with 483mm crown height [equal to a typical 100mm travel XC fork inc. sag] and 50mm offset.

Reynolds Seat Tube

A super high quality Reynolds 853 butted tube, oversize Ø34.9mm for 'Core Stability' and Ø31.6 internally to be compatible with all popular dropper posts and our own Penta carbon seatposts. Exclusive Mason Macro Ø34.1mm seatclamp tops it off. Seat tube also has internal routing for stealth dropper.

BOOST Spacing

148 x 12 at the rear and 110 x 15 at the front for max compatibility with modern MTB wheels. Boost spacing allows us to optimise frame clearance and stability and run large rim widths and big volume tyres.

160/180 Flat-Mount

Our HotShoe2 [Macro & InSearchOf] and RangeFinder [SLR, Exposure, Bokeh3] forks, were amongst the first carbon forks to have Flat-Mount compatability for 160 and 180mm rotors. This allows for controllable, dependable stopping power when riding loaded and in steep, rough conditions.

Shutter Mudguard

ISO tested to 2kg and specific to the HotShoe TriMount. Standard equipment with ISO framesets and bikes. The Shutter helps keep dirt and water away from the rider, meaning you stay fresher on longer rides + it keeps your packs cleaner/dryer. The load platform is for bulky/lighter loads or frequently accessed items, It's ideal for something like a sleeping mat, bivvy bag or jacket etc in drybag. it avoids having to always use a bar-bag which can be annoying and restrict hand positions and mounting points. The flare at the front is for max coverage with large tyres to help stop stuff blowing back, the 'kickup' at the rear is to stop water/grit being hurled into the headset to prolong the bearing life.