RAW Frame Kit
An engaging and sprited ride for folks venturing beyond gravel.
Every MASON bicycle is built for adventures. But the RAW is the bicycle created for the biggest, roughest, most off-the-grid journeys on the planet.
With its flat bar layout and 120mm suspension fork, the RAW takes a mountain bike format and pushes it further: into the realms of bikepacking, adventure racing and remote exploration. Multiple equipment-mounting points enable the longest voyages, carrying fluids, food, and camping gear for the long haul, without compromising on serious off-road performance.
Combining a custom mix of Dedacciai and Reynolds tubing, the RAW is built by hand in Scotland to exacting specifications. The latest update for 2025 future-proofs the RAW with MASON-designed UDH (Universal Derailleur Hanger) dropouts – designed carefully to open up a full choice of modern transmission specifications. Other updates include dedicated rack-mount eyelets at the base of the seat stays and a new colour choice: AccursedOchre.
The RAW is race-proven, with a record that includes the Atlas Mountain Race, the Silk Road Mountain Race and the Highland Trail 550. Race after race, it has delivered results for ultra racers taking on the biggest terrain with days’ or weeks’ worth of kit.
Features
- Full European construction, tubing and components, including custom shaped and formed Dedacciai Zero/Zero Uno as well as Reynolds UK seattube and a ring-reinforced, internally machined 631 head tube.
- Fabrication and wet-painting by Scottish-based Five Land Bikes, as well as eCoat corrosion treatment inside and out.
- CNC machined brake mount and dropouts, developed in conjunction with our Italian manufacturing partners.
- New for 2025: Redesigned CNC dropouts with UDH compatibility and dedicated rack mounts, developed and refined with our Italian makers
- For use with longer travel dropper posts on the smaller sizes, male threaded bottle bosses can be specified allowing for an uninterrupted seat tube and as much seatpost insertion as possible.
- MASON ‘Element’ 3D printed TPU chainstay protector.
- Stealth routed dropper and internal cable/hose routing.
- Premium quality ‘black stainless’ bolt and fittings set.
- Provisions for bolt-on top tube bag and ample full frame bag space with with opened-out front triangle.
- Clearance for 29 x 2.6” tyres and 34 tooth chainring.
- 73mm stainless BSA threaded bottom bracket shell.
- 15 discreet integrated bottle/bag/accessory mounts, including semi-custom options such as male threaded / standard bottle bosses or top tube pack mounting points
Details
There's so much thinking and neat detailing in our products that it's really impossible to tell you all about it here. There's more in the TECH section below, or If you would like to learn absolutely everything about this product grab a cup of tea and go to The Thinking.
The following parts are provided with your frameset;
DedaElementi Headset, MASON Macro clamp, MASON SwitchLever Thru-Axle, Full Black-Stainless bolt set, all fittings and MultiPort inserts, MASON Element chainstay protector. Prepped, faced and chased, ready to build. Standard price includes 15 bottle/bag/accessory mounts, all internal routing and options for male threaded or eyeletted cage/accessory mounts on seat tube and with/without top tube pack mounts.
Technical info
Select size
|
Dimensions (sagged, mm unless specified) |
||
|---|---|---|
| A > | SEAT TUBE C/T | 395 |
| B > | SEAT TUBE C/C | 355 |
| C > | BB DROP | 60 |
| D > | REAR CENTRE | 435 |
| E > | TT EFFECTIVE | 577.7 |
| F > | TT ACTUAL | 565.5 |
| G > | STACK | 610.3 |
| H > | REACH | 426 |
| I > | S/O - 29 x 2.6 (Measured vertically, 50mm in front of BB centre) |
735 |
| J > | OFFSET | 45 |
| K > | TRAIL Trail data for more wheel/tyres in full geo. chart (where applicable) |
118.6 |
| L > | FORK CROWN HEIGHT | 530 |
| M > | HEAD ANGLE | 66 |
| N > | HEAD TUBE LENGTH | 100 |
| O > | VIRTUAL ST ANGLE (BB Centre to Centre of post Clamp at seat height shown) |
75.2/690 |
| P > | WHEELBASE | 1151.2 |
| Q > | HANDLEBAR (OUTSIDE DIMENSION) | 800 |
|
Dimensions (sagged, mm unless specified) |
||
|---|---|---|
| A > | SEAT TUBE C/T | 430 |
| B > | SEAT TUBE C/C | 380 |
| C > | BB DROP | 60 |
| D > | REAR CENTRE | 435 |
| E > | TT EFFECTIVE | 606 |
| F > | TT ACTUAL | 588.4 |
| G > | STACK | 619.4 |
| H > | REACH | 451.2 |
| I > | S/O - 29 x 2.6 (Measured vertically, 50mm in front of BB centre) |
758 |
| J > | OFFSET | 45 |
| K > | TRAIL Trail data for more wheel/tyres in full geo. chart (where applicable) |
118.6 |
| L > | FORK CROWN HEIGHT | 530 |
| M > | HEAD ANGLE | 66 |
| N > | HEAD TUBE LENGTH | 110 |
| O > | VIRTUAL ST ANGLE (BB Centre to Centre of post Clamp at seat height shown) |
75.12/745 |
| P > | WHEELBASE | 1180.3 |
| Q > | HANDLEBAR (OUTSIDE DIMENSION) | 800 |
|
Dimensions (sagged, mm unless specified) |
||
|---|---|---|
| A > | SEAT TUBE C/T | 470 |
| B > | SEAT TUBE C/C | 420 |
| C > | BB DROP | 60 |
| D > | REAR CENTRE | 435 |
| E > | TT EFFECTIVE | 628.4 |
| F > | TT ACTUAL | 606.6 |
| G > | STACK | 628.5 |
| H > | REACH | 471 |
| I > | S/O - 29 x 2.6 (Measured vertically, 50mm in front of BB centre) |
790 |
| J > | OFFSET | 45 |
| K > | TRAIL Trail data for more wheel/tyres in full geo. chart (where applicable) |
118.6 |
| L > | FORK CROWN HEIGHT | 530 |
| M > | HEAD ANGLE | 66 |
| N > | HEAD TUBE LENGTH | 120 |
| O > | VIRTUAL ST ANGLE (BB Centre to Centre of post Clamp at seat height shown) |
75.11/780 |
| P > | WHEELBASE | 1204.3 |
| Q > | HANDLEBAR (OUTSIDE DIMENSION) | 800 |
|
Dimensions (sagged, mm unless specified) |
||
|---|---|---|
| A > | SEAT TUBE C/T | 505 |
| B > | SEAT TUBE C/C | 445 |
| C > | BB DROP | 60 |
| D > | REAR CENTRE | 435 |
| E > | TT EFFECTIVE | 654 |
| F > | TT ACTUAL | 630.4 |
| G > | STACK | 637.7 |
| H > | REACH | 494.3 |
| I > | S/O - 29 x 2.6 (Measured vertically, 50mm in front of BB centre) |
820 |
| J > | OFFSET | 45 |
| K > | TRAIL Trail data for more wheel/tyres in full geo. chart (where applicable) |
118.6 |
| L > | FORK CROWN HEIGHT | 530 |
| M > | HEAD ANGLE | 66 |
| N > | HEAD TUBE LENGTH | 130 |
| O > | VIRTUAL ST ANGLE (BB Centre to Centre of post Clamp at seat height shown) |
75.37/800 |
| P > | WHEELBASE | 1231.6 |
| Q > | HANDLEBAR (OUTSIDE DIMENSION) | 800 |
This page gives you some guidelines based on rider height, but these are only a starting point for a proper bike fitting. There are of course many other factors to consider when choosing the right size for you and sizing advice will vary depending on your choice of model from the Mason range and the way that you intend to ride it. We're always here to help of course and would always recommend a professional bike fitting and visiting us for a ride on the Mason Cycles riverside gravel/country lanes test-loop if you can. There is further advice, based on specific models, below the height chart.
Fitting a bike to a rider is an important process, this information is a start to the process but it’s not really possible to give 100% accurate fitting instructions online.
Humans are odd shapes, each person’s physical dimensions: arm, torso, femur length, level of flexibility, skill level and intended model usage are very different. This means that there will invariably be different frame size requirements, even for people of the same height and inseam.
SIZING ADVICE BASED ON MASON MODELS
ROAD, ALL-ROAD & GRAVEL - Aspect | Resolution | Definition | SLR | BokehTi | Bokeh | Exposure: Size range is 48cm to 62cm depending on specific model. The chart dimensions show the extremes of useable frame size based on height and the rider size range is very similar for all our frames with 6 or 8 standard sizes.
ULTIMATE ADVENTURE - InSearchOf: Size range is 42cm to 58cm [5 sizes]. As a start point, we would recommend selecting one size down from your normal 'road' frame size. For example, if you would normally ride a 54cm then a 50cm InSearchOf is probably best for you.
ADVENTURE HARDTAIL - RAW | Macro: Size range is Sml to XL [4 sizes]. With the advent of modern, more progressive mountain bike geometry, the sizing process is even more fluid. The Mason RAW and Macro are no different: seat tube lengths are kept deliberately low so riders have a certain amount of flexibility in choosing size based on their preferred reach, wheelbase, handling characteristics and intended use. For instance, for high speed and loaded up stability you may prefer a larger frame that will also provide more pack space in the front triangle. Or, if you are spending most of your time on twisty woodland singletrack, you’d benefit from the shorter wheelbase and extra response of the smaller frame.
We are experienced in sizing and geometry, so of course we will be on the end of the phone or email to help and advise, but we would always recommend having a proper bike fit done before committing, especially if you feel like you may be between sizes. If you do fall between our frame sizes, it’s probably best to go with the smaller size. It’s easier to make a smaller frame fit a little larger than vice versa.
CONFIGURATION: With all models, you can use our drop down menus to configure your finishing kit to suit your needs, including which brake lever operates front/rear wheel and for MTB we’re happy to cut down the handlebar to your desired width.
Please email us here or call 01273 463000 if you have further requirements that you would like to discuss, we are always happy to help.
CUSTOM TUBESET RAW
For the RAW every tube has a custom profile, section or bend to work exactly how we want it for ride quality, clearance and durability.
DFORM DOWN TUBE: RAW
We worked with Dedacciai to design and tool for the exclusive Mason ‘DForm’ down tube for the RAW 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.
UP TO 4X BOTTLE / ACCESSORY MOUNTS
The RAW is designed to travel, so all Raw framesets have a full compliment of bottle and accessory mounts. We do not reduce the number of mounting points with smaller frames.
The frame has 4 x bottle/accessory mounts. All sizes have an extra boss on the down tube which allows greater adjustability to make space for an extra bottle on the seat tube or a larger frame-bag under the top tube.
Top tube pack mounting points are standard with the option to order without if not required.
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/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.
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.
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.
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.
Important: Scroll to see 'essential dimensions' with maximum dropper length details.
REYNOLDS RAW SEAT TUBE
A high quality Reynolds seat tube, custom shaped to provide the right balance of tyre clearance and chainstay length. Ø31.6 internally to be compatible with all popular dropper posts and our own Penta carbon seatposts. Exclusive Mason Macro Ø34.9mm seatclamp tops it off. Seat tube also has internal routing for stealth dropper post.
120MM SUSPENSION FORK
The RAW is designed around a 120mm suspension fork with a static axle to crown height of 531mm and an offset of 44mm. This is the ideal amount of fork travel to keep geometry changes in check throughout the stroke and allow traversal of the chunkiest terrain when combined with large volume 29” wheels and tyres.
INBOARD DISC-MOUNT
The caliper is mounted to our custom, CNC’d post mount bridge that sits between the chain and seat stays. This allows us to use lighter seat-stays and maximizes the tubular chainstay for maximum compliance. Native brake rotor size is 160mm, or 180mm with an adapter.
OPTIONAL MALE THREADED BOTTLE BOSSES ON SEAT TUBE
For use with longer travel dropper posts on the smaller sizes, male threaded bosses can be specified allowing uninterrupted seat tube for as much seatpost insertion as possible. Fitted with 8mm, Black Stainless, locking Flange nuts.
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.
BOOST SPACING
148 x 12 at the rear for compatibility with modern MTB wheels. Boost spacing allows us to optimise frame clearance and stability and run large rim widths and big volume tyres.
1X DRIVETRAIN SPECIFIC
Designed specifically around the latest 12 speed mountain bike drivetrains allowing for greater tyre clearance, chain security and performance in muddy conditions. Ultra wide gearing options provide ample range for any terrain.
29ER
Large diameter wheels and tyres are extremely fast-rolling, with a big contact-patch and low rolling resistance. Bikes with 29" wheels are ideal for long-distance adventure, giving speed, comfort and forgiving handling, over an extremely wide range of terrain.
The MASON RAW is designed for 29” MTB wheels and tyres up to 2.6”. Recommended tyre sizes: 29 x 2.3” - 29 x 2.6”.
The MASON Macro is designed for 29” MTB wheels and tyres up to 2.4”. Recommended tyre sizes: 29 x 2.0” - 29 x 2.4”.
3D PRINTED CHAINSTAY PROTECTOR
Custom designed and 3D printed in Europe from thermoplastic polyurethane (TPU). This flexible, rubber like material utilises the latest 3D printing technology to minimise chain slap noise and prevent the paint on the chainstay from getting chipped.
THREADED BB: RAW
The RAW frames use high quality stainless steel 73mm, BSA, threaded bottom bracket shells. 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.
ESSENTIAL DIMENSIONS: RAW
BRAKING
Rotor Size: The rear rotor diameter will be 160mm with the calliper mounted directly to the brake mount. An adapter can be used for a 180mm rear rotor maximum.
Caliper Type: This frame is designed for Post-Mount calipers.
We always recommend using genuine brake mounting hardware and consulting us directly using the 'Technical' dropdown, or using a qualified cycle mechanic if in doubt.
WHEELS + AXLE SPACING
The RAW is designed around the 'BOOST' 148mm hub standard, allowing wider wheels and high volume tyres with larger clearances front and rear. The wider hub flanges result in a stiffer wheel, giving enhanced bike handling and shorter/wider stays allow progressive geometry, whilst a wider rear hub helps give a greater choice of chainrings.
Axle length/pitch: 172x12mm x 1.5tpi axle with 2mm spacer.
TYRE SIZES
All frame sizes are designed for and tested with up to 29x2.6” tyres.
The below are guides only. Fitted width may vary depending on tyre manufacturer and rim width. Please check true fitted dimensions of chosen components to be sure.
Max tyre size: 29" x 2.6"
Min tyre size: 29" x 2.3”
SEAT POST
31.6mm internally routed for dropper post cable routing.
DROPPER SEAT POST MAXIMUM INSERTION
| Frame Size | Max. Dropper Insertion |
| Small | 190mm |
| Medium | 220mm |
| Large | 260mm |
| X-Large | 300mm |
SEAT CLAMP
34.9mm
BB TYPE
73mm shell width. BSA threaded.
HANGER TYPE
Pre 2025: Conventional replaceable hanger, for all conventional, MTB rear mech types.
From 2025: UDH [Universal Derailleur Hanger]. Compatible with all modern rear mech types. Dropout is compatible with SRAM 'T-Type/Transmission' rear mech models.
CHAINRING FIT
1x Cranksets: SRAM - Use 3mm or 0mm offset chainring. Shimano - Use 52mm or 55mm chainline crankset.
Maximum chainring size: 34 tooth round chainring on 52mm chainline.
SUSPENSION FORK COMPATIBILITY
The RAW frame was designed and tested for use with a typical Suspension fork of 120mm travel.
Ideal dimensions: Crown height - 531mm. Offset: 44mm.
Check fork manufacturers data to ensure chosen fork falls within this dimension, longer forks will void warranty.
Stack-washer maximum: 30mm below stem is max. recommended with the Rockshox SID Ultimate. Warranty is void above this dimension. Please ensure manufacturers guidelines are followed when installing other forks.
Crown Clearance: Frame design gives suspension fork crown clearance for most modern forks. We cannot guarantee ALL forks will clear, so please check compatibility/clearance when installing.
HEADSET FIT
Upper: ZS44 press fit, EC44 can be used but will increase stack.
Lower: EC44 press fit.