Mason Definition Shimano

Name: Mason Definition Shimano
Brand: Mason

2026 RoadEndurance Manufacturer page

Mason Definition Shimano, color Sensorblue / Shutterblack Metallic / Vela

Price: Not published

Prices shown first for United States
United Kingdom: £2,900 Last known price
Suspension: Rigid
Wheels: 700c
Gear range: 455%
Frame: Aluminum
Brakes: Rim brake

Sizes

Size guide

48cm
50cm
52cm
54cm
56cm
58cm
60cm
62cm

The manufacturer did not publish rider heights for these sizes.

Components

9 of 15 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

MASON x Dedacciai Custom Aluminium. Not identified

Suspension

1 part

Fork

MASON Aperture2 full carbon fork. Not identified

Drivetrain

5 parts

Cassette

11-34. 105 / Ultegra / Dura-Ace - as selected. Alternative ratios available on request. Not identified
Chain
- Shimano
Crankset

50/34. Select From: 105 12spd Mechanical / 105 12spd Di2 / Ultegra 11spd / Ultegra Di2 12spd / Dura-Ace Di2 12spd. Not identified
Rear derailleur
- Shimano
Shifters
- Shimano

Brakes

1 part

Brakes

Rim Not identified

Wheels and tires

2 parts

Cockpit and contact points

5 parts

Handlebar
- Deda
Headset
- Deda
Saddle
- Fizik
Seatpost

MASON Penta carbon, microadjust. Not identified
Stem
- Deda

Sizes and geometry

8 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 54cm

Table

Reach 383mm

Stack 566mm

Wheelbase 1010mm

Head angle 71.5°

Seat angle 73.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 700c wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 8 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	369.7	380.6	382.5	383	388.3	394.7	396.8	405.5
Stackmm	532.1	543.3	552.8	565.5	579.7	591.1	599.1	620.1
Top tube lengthmm	519	532.8	537.4	551.5	561.1	581.3	586	601
Seat tube lengthmm	480	500	520	540	560	580	600	620
Head tube lengthmm	120	130	140	155	170	180	190	210
Head tube angle	71°	71.5°	71.5°	71.5°	71.5°	72°	72°	72.5°
Seat tube angle	74.5°	74.5°	74.5°	73.5°	73.5°	72.5°	72.5°	72.5°
Chainstay lengthmm	420	420	420	420	420	420	420	420
Wheelbasemm	989	999.1	1004.1	1009.6	1019.7	1024.7	1030.2	1040.2
Front centermm	580	590	595	600	610	615	620	630
Bottom bracket dropmm	73	73	73	71.5	71.5	71.5	70	70
Bottom bracket heightmm	263	263	263	264	264	264	266	266
Standover heightmm	741.4	756.5	770.8	787.3	804	818.1	833.1	853.2
Fork rakemm	45	45	45	45	45	45	45	45
Trailmm	69	66	66	66	66	63	63	60
Stack/reach ratio	1.44	1.43	1.45	1.48	1.49	1.50	1.51	1.53
Suspension and parts
Crank lengthmm	165	170	170	172.5	172.5	175	175	175
Stem lengthmm	70	80	90	100	110	110	120	120

Not published by the manufacturer: Front travel, Rear travel, Handlebar width, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Fork material: Carbon
Frame weight: 0.45 kg

1.0 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 34
Largest chainring: 50
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 29.0 in
Highest gear: 131.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Wheel material: Aluminum
Wheel size: 700c

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

29.0 gear inches

This value is within the central range for this class.

Cohort: Road / Endurance Model year: 2026
Sample: 479 bicycles with this information
Coverage: 79.3% of the class

Highest gear

131.8 gear inches

This value is within the central range for this class.

Cohort: Road / Endurance Model year: 2026
Sample: 479 bicycles with this information
Coverage: 79.3% of the class

Shifting

Mechanical

327 of 604 bicycles with this information use electronic shifting.

Cohort: Road / Endurance Model year: 2026
Sample: 604 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 11.1 km/h
Highest gear: 50.5 km/h

Total gear range 455%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 29.0–131.8 gear inches
Class reference (p10–p90): 26.6–139.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Endurance Model year: 2026
Lowest gear: 479 bicycles with this information, 79.3% of the class
Highest gear: 479 bicycles with this information, 79.3% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2026 builds
Specification	This bicycle Mason Definition Shimano	Mason Definition Campagnolo	Mason Definition Integrale Campagnolo	Mason Definition Integrale Shimano	Mason Definition Integrale SRAM	Mason Definition SRAM
Frame
Frame weight	0.45 kg	0.45 kg	1.78 kg	1.78 kg	1.78 kg	0.45 kg
Drivetrain
Front chainrings	2	Not informed	2	2	2	2
Smallest chainring	34	Not informed	34	34	35	35
Largest chainring	50	Not informed	50	50	48	48
Smallest sprocket	11	Not informed	9	11	10	10
Largest sprocket	34	Not informed	42	34	36	36
Lowest gear	29.0 in	Not informed	23.5 in	29.0 in	28.2 in	28.2 in
Highest gear	131.8 in	Not informed	161.1 in	131.8 in	139.2 in	139.2 in
Rear sprockets	Not informed	13	Not informed	Not informed	12	12
Cockpit
Shifting	Mechanical	Mechanical	Mechanical	Mechanical	Electronic	Electronic
Other specifications
Tire clearance	Not informed	Maximum tire width: 35c; Additional specification: Wheel kind: 700	Maximum tire width: 35c	Maximum tire width: 35c	Maximum tire width: 35c; Additional specification: Wheel kind: 700	Not informed