Bokeh Ti GRX Di2 £6,400.00

Bokeh Ti GRX Di2

"Mason’s new Bokeh takes all that I loved about the original alloy bike and has amped it up to the all-roading, gravel-riding titanium max."

Overall: 4.5/5. BikeRadar, 2020.

The exclusive Bokeh Ti frameset is welded in small batches in Tuscany, Italy, and pre-order only. The bicycle builds shown here is our factory spec option, but if you'd like to go custom we'll work with you to bring you your perfect bicycle.

This is our ultimate smooth, comfortable, fast, Multi-Terrain, Continent Crushing, Ultra Endurance machine! 

The BokehTi takes all the characteristics of our hugely popular, award and review winning Bokeh Alu and adds the incredibly taut, propulsive ride that is made possible by a full custom Italian tubeset made just for us by Dedacciai. 

This bike is designed for an engaging, spirited and dynamic ride across a hugely varied spectrum of surfaces and terrain. Take a look at our BokehTi gallery for an idea of how owners have specified their builds to exactly suit their riding styles or planned adventures.

GRX Di2 is Shimano's fully electronic adventure-riding specific groupset. Designed with a range of unique performance features and ergonomics developed over several years to make adventure riding as fast and comfortable as possible.

Our builds are available with 1×11 or 2×11 cranksets, both using adventure/bikepacking tuned ratios, and the latest clutched RX-817 Di2 derailleurs to match.

Please contact us for more details.

Mason Custom Programme

Individual Inspriring Bicycles are what we do. All our Mason models are as close to ‘custom’ as you can get with their bespoke tubing design and carefully designed build levels. Because the BokehTi frames are built to order, we can take the ‘individual’ to a new level and give you the choice of a ‘standard’ build drawn from one of our Bokeh build levels such as the GRX Di2 build shown here, or choose to base your BokehTi build on your ideal specification. Whilst your frame is being welded and carefully finished you also have the chance to specify a full ‘Mason Custom Build’, basing your finished bicycle on a choice of components from our various carefully chosen suppliers. Please contact us HERE for further information on this process and to start your dream build.

Each frame is welded to order: This is a highly refined and small volume product, so we make to pre-order only by taking a 50% deposit for the frameset.

We can make certain detail alterations to the frame features and geometry and we can discuss these as part of the ordering process.

Please contact us to get the process started.

Features

  • The 'Parallax2' carbon monocoque fork has been refined for 2019 in conjunction with our Italian frame builders, it uses a Ø12mm thru-axle, flat-mount and internally routed dynamo and brake hose porting, weighing just 465g.
  • This bike can be fitted with the Mason Luminance Upgrade. The ultimate dynamo + lighting set-up for all-terrain and multi-surface adventures. See 'Accessories + Upgrades' for details.
  • Available in 1x ( 42T : 11-42) or 2x (48/31 : 11-34).
  • Full Shimano GRX 815, 11speed, electronic Di2 groupset.
  • Ø12mm, MASON 'SwtichLever' Front and Rear thru-axles.
  • Mason MultiPort system for adaptable internal routing.
  • Fully eyeletted, internally routed and Di2 ready as standard.
  • 3rd Bottle cage bosses on the underside of the down tube give extra fluid carrying ability for longer adventures, or a handy tool-keg mounting point
  • Micro-bead blast 'Structural Surface Finish' with mirror-polished MASON graphics and discrete 'special for Ti' decals.
  • Mason-developed, Reynolds double-bend and tapered titanium chain stays.
  • Reynolds UK, 3D-Printed Titanium Thru-axle/Flat-mount dropouts.
  • Dedacciai, custom formed & shaped, Titanium 3AL-2.5V frame with Mason Parallax2 full carbon Thru-axle/Flat-mount fork
  • Innovative, Made in Italy Fizik Terra Argo X3 Saddle.

Details

Our frame sets deserve the best components, so we put a great deal of thought into the mix of parts used for each bike build. Bars, stem and crankset are sized to match frame size choice, but we can sometimes make sizing adjustments at your request.

If you would like to make it your own and dial-in the sizing or component choice for your dream build, go ahead and choose using the options in the 'Configure' option above.

Now available at your request are a range of HUNT wheelsets, a huge range of tyres and Ritchey VentureMax WCS Flare 'bars in all sizes. We're constantly improving our range of components to give you the ideal choice for bikepacking set-ups and precise off-road handling.

We'll set-up the front brake to be operated by the Right Hand lever for all UK destinations. For destinations outside of the UK, please choose your brake set-up in the Config. menu above the 'Order This Bike' button.

See full geometry chart for details.

Order this bike Or ask us a question

Images may not exactly represent final bike build. See ‘Specifications’ for full listing.

Technical info

Select size
 

Dimensions
(mm unless specified)
A > SEAT TUBE C/T 480
B > SEAT TUBE C/C 432.2
C > BB DROP 77
D > REAR CENTRE 435
E > TT EFFECTIVE 515.9
F > TT ACTUAL 497.8
G > STACK 536.1
H > REACH 359.9
I > STAND-OVER 741
J > OFFSET 50
K > TRAIL
Trail data for more wheel/tyres in full geo. chart (where applicable)
74.7
L > FORK CROWN HEIGHT 398
M > HEAD ANGLE 69.5
N > HEAD TUBE LENGTH 100
O > SEAT TUBE ANGLE 74
P > WHEELBASE 1013
Q > HANDLEBAR (OUTSIDE DIMENSION) 40
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 500
B > SEAT TUBE C/C 453
C > BB DROP 75
D > REAR CENTRE 435
E > TT EFFECTIVE 519.9
F > TT ACTUAL 503.9
G > STACK 537.9
H > REACH 363.5
I > STAND-OVER 764.1
J > OFFSET 50
K > TRAIL
Trail data for more wheel/tyres in full geo. chart (where applicable)
75.3
L > FORK CROWN HEIGHT 398
M > HEAD ANGLE 70
N > HEAD TUBE LENGTH 115
O > SEAT TUBE ANGLE 74
P > WHEELBASE 1013.7
Q > HANDLEBAR (OUTSIDE DIMENSION) 42
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 520
B > SEAT TUBE C/C 473.0
C > BB DROP 75
D > REAR CENTRE 435
E > TT EFFECTIVE 535.9
F > TT ACTUAL 520.3
G > STACK 554
H > REACH 374.0
I > STAND-OVER 781.8
J > OFFSET 50
K > TRAIL
Trail data for more wheel/tyres in full geo. chart (where applicable)
72.0
L > FORK CROWN HEIGHT 398
M > HEAD ANGLE 70.5
N > HEAD TUBE LENGTH 130
O > SEAT TUBE ANGLE 74
P > WHEELBASE 1021.8
Q > HANDLEBAR (OUTSIDE DIMENSION) 42
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 540
B > SEAT TUBE C/C 493.5
C > BB DROP 73
D > REAR CENTRE 435
E > TT EFFECTIVE 551
F > TT ACTUAL 534.4
G > STACK 568.1
H > REACH 376.2
I > STAND-OVER 799.4
J > OFFSET 50
K > TRAIL
Trail data for more wheel/tyres in full geo. chart (where applicable)
68.7
L > FORK CROWN HEIGHT 398
M > HEAD ANGLE 71.0
N > HEAD TUBE LENGTH 145
O > SEAT TUBE ANGLE 73
P > WHEELBASE 1028.4
Q > HANDLEBAR (OUTSIDE DIMENSION) 44
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 560
B > SEAT TUBE C/C 513.7
C > BB DROP 73
D > REAR CENTRE 435
E > TT EFFECTIVE 561.4
F > TT ACTUAL 546.3
G > STACK 579.5
H > REACH 383.4
I > STAND-OVER 814.8
J > OFFSET 50
K > TRAIL
Trail data for more wheel/tyres in full geo. chart (where applicable)
65.4
L > FORK CROWN HEIGHT 398
M > HEAD ANGLE 71.5
N > HEAD TUBE LENGTH 155
O > SEAT TUBE ANGLE 73
P > WHEELBASE 1034.4
Q > HANDLEBAR (OUTSIDE DIMENSION) 44
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 580
B > SEAT TUBE C/C 534.1
C > BB DROP 70
D > REAR CENTRE 435
E > TT EFFECTIVE 580.8
F > TT ACTUAL 567.2
G > STACK 587.9
H > REACH 395.2
I > STAND-OVER 831.0
J > OFFSET 50
K > TRAIL
Trail data for more wheel/tyres in full geo. chart (where applicable)
62.1
L > FORK CROWN HEIGHT 398
M > HEAD ANGLE 72
N > HEAD TUBE LENGTH 165
O > SEAT TUBE ANGLE 72.5
P > WHEELBASE 1045.4
Q > HANDLEBAR (OUTSIDE DIMENSION) 46
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 60
B > SEAT TUBE C/C 554.2
C > BB DROP 70
D > REAR CENTRE 435
E > TT EFFECTIVE 590.7
F > TT ACTUAL 577.1
G > STACK 607.0
H > REACH 399.1
I > STAND-OVER 850.0
J > OFFSET 50
K > TRAIL
Trail data for more wheel/tyres in full geo. chart (where applicable)
62.1
L > FORK CROWN HEIGHT 398
M > HEAD ANGLE 72
N > HEAD TUBE LENGTH 185
O > SEAT TUBE ANGLE 72.5
P > WHEELBASE 1055.4
Q > HANDLEBAR (OUTSIDE DIMENSION) 46
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 620
B > SEAT TUBE C/C 574.7
C > BB DROP 70.0
D > REAR CENTRE 435
E > TT EFFECTIVE 600.5
F > TT ACTUAL 585.8
G > STACK 630.7
H > REACH 401.4
I > STAND-OVER 871.7
J > OFFSET 50
K > TRAIL
Trail data for more wheel/tyres in full geo. chart (where applicable)
62.1
L > FORK CROWN HEIGHT 398
M > HEAD ANGLE 72
N > HEAD TUBE LENGTH 210
O > SEAT TUBE ANGLE 72.5
P > WHEELBASE 1065.5
Q > HANDLEBAR (OUTSIDE DIMENSION) 46

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.

Sizing 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.

MTB, TRAIL/TRAVEL - RAW: 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 is 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.

 

Multiport

Unique to MASON. 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 are the first to bring this type of system to a performance steel frame. Interchangeable alloy parts allow five options:

1. Full cable outer. 2. Hydraulic Hose. 3. Split outer. 4. Electronic cable [e.g. Shimano Di2]. 5. 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.

Threaded Bottom Brackets

We choose a more traditional 68mm, BSA, threaded standard for our AdventureSport frames because we believe it 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.

F-Stop Axle System: Bokeh

The Mason F-Stop Axle System was developed for our exclusive Aperture2 fork and we now use the special axle for the Mason Parallax fork on the Bokeh and BokehTi.
The axle uses a positive-closure release lever, ensuring that the wheel is always securely and firmly mounted with the added advantage of a visual check for the lever closure and orientation.

The F-Stop system also includes a ‘clockable’ thread on the axle, meaning you can always position the release lever exactly where you want it.

Internal Routing

The cables, hoses and electronic shift control wires run through the frame tubes, 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.

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. 

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.

 

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 a properly designed carbon-monocoque fork like the Parallax or Aperture2, the contemporary Aluminium, steel or Titanium frame is a formidable piece of kit.

Structural FInish

Our 'structural surface finish' is highly resilient to dirt, debris, and abrasion. The soft-sheen, bead-blasted surface finish helps to stress relieve the skin of the frame after welding. This process improves its toughness, discourages surface cracking and produces a beautiful, long lasting lustre on the Ti tubing.

Re-Machinable Bearing Seats

Fully integrated, bonded in headset cups are replaceable [re-machinable by Mason] in the rare occurance of wear or damage. Mason frames and bicycles are an investment and features like this vastly extend the lifetime of your bicycle.

QuadSlot Seat Tube

Rather than the usual single slot, we machine 4 slots into the seat tube to allow the seat-clamp to exert even and gentle clamping force on your seat-post for smooth adjustment. The QuadSlot system also reduces stress loadings on the seat tube and post, prolonging the life of both. The slots are also positioned to discourage dirt ingress from the rear tyre.

3D-Printed Ti Dropouts

We were heavily involved in the development of the highly advanced Reynolds UK, 3D printed Titanium, thru-axle/flat-mount dropouts that we use for the BokehTi. The dropouts are extremely precise and lightweight and provide highly accurate and stiff axle retention. The interior is a highly complex structure, only made possible by using this advanced 3D ‘Additive Manufacturing’ process, internal ribs, gussets and guides deal with riding forces and guide internally routed electronic-shifting cables. Alongside the dropouts, we worked with Reynolds to create beautiful new double-bend and tapered titanium chain stays. The stays mate perfectly with the dropouts and combine to give us the huge tyre clearance and smooth propulsion that we require.

For you this means perfect alignment and extremely efficient power transfer, helping to give the BokehTi it’s incredible ride quality and ultra-distance, terrain conquering mastery.

Thru-Axle Front & Rear

Our Steel and Alu. frames use the Mason ‘F-Stop’ thru-axles up front and bolt-thru axles at the rear. Our Titanium frames use the F-Stop axles front & Rear.
The F-Stop system is clockable to your desired position and can be adjusted as it 'beds-in', giving you a 'tool-free' and serviceable thru-axle with a familiar QR-style lever locking system. Threads are replaceable if damaged.

31.6 Seat Post

The titanium tubing with custom tube shapes and bends does a superb job of damping vibration. This means that we can use an oversize Ø34.9mm seat tube to give maximum stability to the BB shell, with our Ø31.6 Mason Penta seat post enhancing rider output.

Dedacciai Ti Tubing

The BokehTi uses a full compliment of custom 3AL-2.5V/GR9 seamless tubing. Every tube is designed or shaped specifically for Mason and specially for the BokehTi, 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 maker in Italy. THIS is the key to the superb, ‘grin inducing’ ride of these award winning bikes.

The BokehTi possesses the spirit and soul of the Bokeh Alu, it retains its sorted geometry and incredible lively, engaging feel but with added tautness and smooth propulsion provided by a modern, full custom Titanium tubeset.

Parallax2 Thru-Axle Fork

Unique to MASON. This frame is fitted with our ‘Parallax2’ 465g, Ø12mm thru-axle/flat-mount, monocoque carbon fork. We develop our own custom tubing and wheels, so when it comes to the forks for our bicycles it makes total sense for us to design and tool up for our own fork too. We don’t want to compromise ride-feel, balance and performance by using an ‘off-the-shelf’ and generic product.
Features: Custom layup UD carbon construction, Mason F-Stop axle with clockable axle, allowing you to re-position the release lever as things bed in. TrueTaper steerer, sealed Internal Routed brake & dynamo routing, dynamo light eyelet on crown, triple-boss eyelets on both fork legs, discrete eyelets for mudguard mounting. Huge clearance with full mudguard clearance even when using the largest tyres.

Recommended tyre sizing: 700c x 40mm [45mm Max.] 650b x 50mm/2” [2.1” Max.]

Essental Dimensions: Bokeh

BRAKING

Rotor Size: The fork can take a 140 or 160mm rotor [using adaptor]. We recommend no smaller than 160mm up front if you are using cable braking. 160mm is the maximum recommended diameter for the rear and the native rotor size is 140mm.

Calliper Type: These frames are designed for flat-mount calipers. It's possible to fit post-mount calipers front and rear with the use of a flat > post-mount adapter.

Bokeh Flat-Mount Mounting Bolt Lengths: FRONT - 15mm. REAR - SRAM: 22mm. Shimano: 28mm.
BokehTi Flat-Mount Mounting Bolt Lengths: FRONT - 15mm. REAR - SRAM: 27mm. Shimano: 33mm.

Bolt lengths for mounting Flat-Mount brake calipers to our frames vary because of the different dropout designs and materials used across our range.

We always recommend using genuine hardware and consulting us directly using the 'Technical' dropdown, or using a qualified cycle mechanic if in doubt.

NOTE: This frame is compatible with most modern disc-brake systems but may not be suitable for ALL brake callipers. Please check clearance before purchasing your braking system.

WHEELS + AXLE SPACING

Ø12mm Thru-axle Front / Ø12mm Thru-axle rear.

Front axle spacing: 100mm. Rear axle spacing: 142mm.

Axle length/pitch: Bokeh: Front - 120mm/1.5P. Rear - 160mm/1.5P. BokehTi: Front - 120mm/1.5P. Rear - 172mm/1.5P.

TYRES

The below are guides only. Fitted width may vary depending on manufacturer and rim width. Please check true dimensions of chosen components to be sure.

Bokeh:

Max tyre widths with 'guards:

700C x 41mm | 650B x 50mm.

Max tyre widths without 'guards:

700C x 45mm | 650B x 52mm.

SEAT POST

Bokeh: 27.2mm. BokehTi: 31.6mm.

SEAT CLAMP

Bokeh: 31.8mm. BokehTi: 34.9mm.

FRONT MECH

Bokeh: 31.8mm. 62cm: 34.9mm. BokehTi: 34.9mm.

BB TYPE

68mm shell width. BSA threaded.

PARALLAX2 FORK

Headset type: Integrated, 41.8Ø upper, 51.8Ø lower, for taper head tube. Angular Contact Bearings. The head-tube seat angle is 45º.

Stack-washer maximum: 40mm below stem is max. recommended for carbon steerer. Warranty is void above this dimension.

Dimensions: Crown height - 398mm. Offset - 50mm.

Mounting Bolt Torque: 4Nm.

Accessory Cages: Max load capacity 3kg per side. Follow manufacturers installation and loading instructions.

Specifications

Our frame sets deserve the best components, so we put a great deal of thought into the mix of parts used for each bike build. Bars, stem and crankset are sized to match frame size choice. See Geometry chart for component sizing.

Frame Dedacciai, custom formed & shaped, Titanium 3AL-2.5V frame with Reynolds 3D-Printed Dropout.
Fork Mason Parallax2 full carbon Thru-Axle fork.
Headset DEDA Low profile integrated headset.
Colours Bead-blasted 'Structural Finish'
Bike Weight 54cm 9.2kg.
Sizes 50, 52, 54, 56, 58, 60, 62.
Shifting Shimano GRX-815 Di2 Shifting.
Chainset Shimano GRX-810 1x (42T) / 2x (48/31)
Cassette Shimano M8000 11-42. / CS800 11-34
Chain Shimano HG701 11 Spd.
Braking Shimano GRX-810 Hydro Calipers.
Tyres Choice of Schwalbe, Panaracer, WTB.
Wheels HUNT Four Season Gravel Disc X-Wide / Mason X HUNT 650B AdventureSport Disc. Other models available.
Handlebar Deda Gravel100
Clamp MASON Macro alloy ultralight.
Seatpost MASON Penta carbon, microadjust.
Saddle Fizik Terra Argo X3.
Bar Tape Mason Grip Tape.
Stem DEDA Zero100.