Definition Red AXS £5,995.00

Size

Colour

  1. Shutter Black
  2. Lens Blue
  3. Element Grey

Frame in stock.

Definition Red AXS

The revolutionary SRAM AXS groupset is a leap forwards in multi-surface bicycle technology. Developed in response to serious riders going faster and further than before and into rugged territory found way beyond the end of the road.

World leading 12spd. wireless electronic shifting, advanced braking systems and re-imagined chains, with our test winning, Italian crafted Definition2 frameset at its heart. This stunning bicycle firmly underlines the 'Progressive' in our brand's title.

A radical approach to gear ratios and a progressive new design ethos with the adventurous rider in mind has resulted in the ultimate #FastFar groupset - SRAM's Red AXS. Partnered up with our award-winning Definition frameset, THIS is the cutting-edge in a multi-surface/all-season bike. An increase in gear range and a smoother progression through the sprockets, all made possible by unique 12spd. cassettes and non-traditional chainrings.

This bike is not bounded by roads only, and adding some rough-terrain to your road rides is well within the Definition Red AXS's multi-surface remit. The newly developed 'Orbit' chain management system utilises a fluid clutch system to reduce chain slap and noise to a minimum, keeping it totally secure when the gravel gets going. Its self-adjusting derailleurs trim automatically so eliminating cage rub and making sure you are running at the most efficient at all times. Shifting is almost effortless which pays big dividends when taking on long adventures and ultra-endurance rides.

Wireless gear shift systems eliminate the remove the risk of a gear cable breaking or a wire failing, and the complete lack of any external wiring makes the bike extremely easy to clean, there is nothing to snag and combined with the internal brake-hose routing means there is nothing to hinder the fitting of frame bags and packs.

The specific RED AXS HRD calipers on this bike have an extremely refined modulation. The brake levers also have independent contact point and reach adjustments so you can really dial-in your position on the bike. Perfect fit means reduced fatigue allowing you to remain fresher, stay on the bike for longer and travel further. The eTap system offers complete customisation over shift speed and is programmable for shifting behaviour.


This incredibly refined and advanced bicycle is available with any of the award-winning Hunt Bike Wheels range including the 'Mason X Hunt 4Season Disc' or the HUNT '30Carbon AeroDisc' wheelsets.

Features

  • Red AXS 12spd: The most intuitive high performance groupset. Totally wireless electronic integration, unparalleled control and propgressive gearing.
  • Please contact us for 1X build options.
  • Clearance for full mudguards with 30mm tyres.
  • Fully and discretely eyeletted for rack and ‘guards.
  • Carbon Mason Penta microadjust post and Mason Macro clamp.
  • Specially developed, Mason x Hunt 4Season V2 wheelset. Now updated with a wider rim and reflective details.
  • Large volume Schwalbe tyres designed for maximum speed, ride quality and all-surface control. Supplied tubeless.
  • Dedacciai, custom formed, triple-butted performance Aluminium frame with Mason Aperture2 full carbon Thru-Axle/Flat-Mount fork and our Thru-Axle/Flat-Mount dropouts.
  • Inspired Flattop technology enables a narrower chain with quieter operation and increased strength and durability.
  • RED XG-1290 Cassette benefits from Deep Range gearing - a smoother progression throughout the range.
  • HydroHC, AXS-enabled brake system is fully customisable and refined for AXS.
  • 'Orbit' Fluid Clutch chain management technology keeps drivetrain totally secure and silent.
  • Front and Rear Mechs feature AXS personalization technology.
  • CNC'd and integrated chainring designs are lighter, stiffer and more durable.
  • Deep Range gearing tech. has a smoother progession through the gears and wider range too.
  • Deda Elementi SuperZero or Superleggera, internally routed, carbon handlebar and SuperZero/Superleggera stem.

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 Deda Superzero or Superleggera 'bars in all sizes.

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

 

Technical info

Select size
 

Dimensions
(mm unless specified)
A > SEAT TUBE C/T 500
B > SEAT TUBE C/C 452.7
C > BB DROP 73
D > REAR CENTRE 420
E > TT EFFECTIVE 532.8
F > TT ACTUAL 516.8
G > STACK 543.3
H > REACH 380.6
I > STAND-OVER 756.5
J > OFFSET 45
K > TRAIL 66.3
L > FORK CROWN HEIGHT 380
M > HEAD ANGLE 71.5º
N > HEAD TUBE LENGTH 130
O > SEAT TUBE ANGLE 74.5º
P > WHEELBASE 999.1
Q > HANDLEBAR (OUTSIDE DIMENSION) 40/42
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 520
B > SEAT TUBE C/C 473.0
C > BB DROP 73
D > REAR CENTRE 420
E > TT EFFECTIVE 537.4
F > TT ACTUAL 522.7
G > STACK 552.8
H > REACH 382.5
I > STAND-OVER 770.8
J > OFFSET 45
K > TRAIL 66.3
L > FORK CROWN HEIGHT 380
M > HEAD ANGLE 71.5º
N > HEAD TUBE LENGTH 140
O > SEAT TUBE ANGLE 74.5º
P > WHEELBASE 1004.1
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 71.5
D > REAR CENTRE 420
E > TT EFFECTIVE 551.5
F > TT ACTUAL 536.3
G > STACK 565.5
H > REACH 383.0
I > STAND-OVER 787.3
J > OFFSET 45
K > TRAIL 66.3
L > FORK CROWN HEIGHT 380
M > HEAD ANGLE 71.5º
N > HEAD TUBE LENGTH 155
O > SEAT TUBE ANGLE 73.5º
P > WHEELBASE 1009.6
Q > HANDLEBAR (OUTSIDE DIMENSION) 44
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 560
B > SEAT TUBE C/C 513.6
C > BB DROP 71.5
D > REAR CENTRE 420
E > TT EFFECTIVE 561.1
F > TT ACTUAL 546.7
G > STACK 579.7
H > REACH 388.3
I > STAND-OVER 804
J > OFFSET 45
K > TRAIL 66.3
L > FORK CROWN HEIGHT 380
M > HEAD ANGLE 71.5º
N > HEAD TUBE LENGTH 170
O > SEAT TUBE ANGLE 73.5º
P > WHEELBASE 1019.7
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 71.5
D > REAR CENTRE 420
E > TT EFFECTIVE 581.3
F > TT ACTUAL 566.9
G > STACK 591.1
H > REACH 394.7
I > STAND-OVER 818.1
J > OFFSET 45
K > TRAIL 63.2
L > FORK CROWN HEIGHT 380
M > HEAD ANGLE 72º
N > HEAD TUBE LENGTH 180
O > SEAT TUBE ANGLE 72.5º
P > WHEELBASE 1024.7
Q > HANDLEBAR (OUTSIDE DIMENSION) 46
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 600
B > SEAT TUBE C/C 554.0
C > BB DROP 70
D > REAR CENTRE 420
E > TT EFFECTIVE 586
F > TT ACTUAL 574.3
G > STACK 599.1
H > REACH 396.8
I > STAND-OVER 833.1
J > OFFSET 45
K > TRAIL 63.2
L > FORK CROWN HEIGHT 380
M > HEAD ANGLE 72º
N > HEAD TUBE LENGTH 190
O > SEAT TUBE ANGLE 72.5º
P > WHEELBASE 1030.2
Q > HANDLEBAR (OUTSIDE DIMENSION) 46
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 480
B > SEAT TUBE C/C 43.29
C > BB DROP 73
D > REAR CENTRE 420
E > TT EFFECTIVE 519
F > TT ACTUAL 502.3
G > STACK 532.1
H > REACH 369.7
I > STAND-OVER 741.4
J > OFFSET 45
K > TRAIL 69.5
L > FORK CROWN HEIGHT 380
M > HEAD ANGLE 71
N > HEAD TUBE LENGTH 120
O > SEAT TUBE ANGLE 74.5
P > WHEELBASE 989
Q > HANDLEBAR (OUTSIDE DIMENSION) 40/42
Dimensions
(mm unless specified)
A > SEAT TUBE C/T 620
B > SEAT TUBE C/C 574.3
C > BB DROP 70
D > REAR CENTRE 420
E > TT EFFECTIVE 601
F > TT ACTUAL 588.8
G > STACK 620.1
H > REACH 405.5
I > STAND-OVER 853.2
J > OFFSET 45
K > TRAIL 60
L > FORK CROWN HEIGHT 380
M > HEAD ANGLE 72.5
N > HEAD TUBE LENGTH 210
O > SEAT TUBE ANGLE 72.5
P > WHEELBASE 1040.2
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. The 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 standard sizes [50-60cm]. InSearchOf sizing: 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.

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 even skill level are very different. This means that there will invariably be different frame size requirements, even for people of the same height and inseam.

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 I would always recommend having a proper bike fit done before committing, especially if you feel like you may be between sizes.

We have specified bar width, stem length, and crank length to be the best fit for the majority of riders on each frame size, but we can sometimes make adjustments to this at your request. Please contact us for advice, or just let us know your sizing requirements in the comments box at the checkout page.

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, we'll set-up your bicycle with Front Brake/Left Hand as standard. It's no problem for us to set-up the brakes in your own chosen configuration, please state in 'Order Notes' how you like 'em.

If you are between 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.

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

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.

ThruBB

'ThruBB' is unique to MASON. The large 50mmØ presents a large weld area to the base of the down tube and then steps down to the 68mm width threaded seats. This step-down provides plenty of space around the outside of the bottom-bracket bearings to allow the control cable and hose to pass through on the way to the chain stays and out to the brake and rear mech.

IMPORTANT: This BB shell design requires the use of a bottom bracket with a 24mm 'sleeved' axle, because the hose/cables run through the shell and under the axle. DO NOT use a bottom bracket type without a sleeve. Campagnolo sleeves are available on the site HERE. Please contact us if you would like advice on compataible cranksets/BB types.

BoatTail Stays

Unique to MASON. The seat stays flow out of the ovalised top tube and then curve and taper down to meet the chain stays which curve up towards the axle. We call this ‘BoatTail’, a custom bend giving disc-rotor and calliper clearance, helping to avoid chain-slap on the rough stuff and allowing a little compliance to help smooth the ride.

Fork

Unique to MASON. This frame is fitted with our new 'Aperture2' 365g, Ø12mm thru-axle/flat-mount, monocoque carbon fork. Features: Mason F-Stop axle system including replaceable axle inserts and clockable axle, TrueTaper steerer, Internal Routing, Full mudguard clearance, space for 32mm tyres + 'guards [up to 35mm without 'gaurds, depending on rim/tyre spec] Custom layup UD carbon construction, discrete eyelets.

Dedacciai Tubing

This frame is constructed from Triple Butted, Hand Selected, custom shaped, 7000 series, Dedacciai Alu tubes and tig welded by hand with beautiful Smooth weld beads. The welds require no after sanding or finishing, so there is no thinning and weakening of the tubes at crucial areas. The frame is fully heat treated and stress relieved after welding.

27.2 Seat Post

Our oversize seat tubes don't house oversize seat posts. The large diameter seat tube helps the 'core-stability' of the frame but large, stiff seat posts don't help rider comfort. A 27.2mm post helps to dial out road-buzz and the smoother ride means you stay fresher for longer.

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.

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 advatage 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.

 

Essential Dimensions: Resolution/Definition/Aspect

BRAKING

Resolution Rotor Size: The fork can take a Ø140 or Ø160mm rotor [using adaptor], if you are using Shimano IceTech rotors then Ø140mm rotors either end are fine in normal use, although Shimano recommend Ø160 both ends for larger riders or extended long descents, especially when loaded. SRAM recommend Ø160mm front/rear. A Ø160mm up front is best if you are using cable braking. The Resolution2, with Thru-Axle front & rear will now accept a Ø160mm rotor on the rear. [140mm is the maximum recommended diameter for the V1 rear].

Resolution Caliper Type: Frames are fitted with the Flat-Mount front & rear (adaptable to post-mount with correct adapter). There are no clearance issues with modern Shimano or SRAM hydraulic systems or mechanical systems such as ‘TRP Spyre’. Some bulky systems like the ‘TRP HyRd’ may have compatibility issues on smaller size frames. Please contact us for advice if you are in doubt.

Definition Rotor Size: The fork can take a Ø140 or Ø160mm rotor [using adaptor], if you are using Shimano IceTech rotors then Ø140mm rotors either end are fine in normal use, although Shimano recommend Ø160 both ends for larger riders or extended long descents, especially when loaded. SRAM recommend Ø160mm front/rear. A Ø160mm up front is best if you are using cable braking. 160mm is the maximum recommended diameter for the rear.

Definition Caliper Type: Frames are fitted with the flat-mount front and flat-mount rear. There are no clearance issues with modern Shimano systems or mechanical systems such as ‘TRP Spyre’. Some bulky systems like the ‘TRP HyRd’ may have compatibility issues on smaller size frames.

Aspect Rotor Size: The fork can take a Ø140 or Ø160mm rotor [using adaptor], if you are using Shimano IceTech rotors then Ø140mm rotors either end are fine in normal use, although Shimano recommend Ø160 both ends for larger riders or extended long descents, especially when loaded. SRAM recommend Ø160mm front/rear. A Ø160mm up front is best if you are using cable braking.

Aspect Caliper Type: Frames are fitted with the Flat-Mount front & rear (adaptable to post-mount with correct adapter). There are no clearance issues with modern Shimano or SRAM hydraulic systems or mechanical systems such as ‘TRP Spyre’. Some bulky systems like the ‘TRP HyRd’ may have compatibility issues on smaller size frames. Please contact us for advice if you are in doubt.

NOTE: Our frames are 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/AXLES

Resolution2:

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

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

Axle length/pitch: Front - 120mm/1.5P. Rear - 166mm/1.5P.

Definition2:

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

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

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

Definition2:

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

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

Axle length/pitch: 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.

Resolution/Definition:

Max tyre width with mudguard: 30mm.

Max tyre width without mudguard: 33mm (untreaded).

SEAT POST

27.2mm.

SEAT CLAMP

31.8mm.

FRONT MECH

31.8mm

BB TYPE

68mm shell width. BSA threaded.

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.

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, triple-butted performance Aluminium frame.
Fork Mason Aperture2, thru-axle/flat-mount, full carbon fork.
Headset DEDA Low profile integrated headset.
Colours Lens Blue. Shutter Black. Element Grey
Bike Weight 54cm - 8kg
Clamp MASON Macro alloy ultralight.
Sizes 48, 50, 52, 54, 56, 58, 60, 62
Shifting SRAM Red AXS Wireless
Chainset SRAM Red 48/35 2X / 46T 1X
Cassette SRAM Red AXS XG-1290 10-33
Chain SRAM Red AXS Chain D1
Braking SRAM Red HRD F160/R160
Tyres Schwalbe, G-One 30mm or Pro-One 28mm
Wheels MASON x HUNT 4Season V2 Disc or HUNT 30CarbonAero Disc.
Handlebar DEDA Superzero Carbon
Seatpost MASON Penta carbon, microadjust.
Saddle Fabric Scoop, Shallow, Pro Carbon. 189g.
Bar Tape Fabric Knurl tape.
Stem DEDA Superzero.