Calibre Bossnut

2025 MountainTrail Manufacturer page

Travel: 140 / 135 mm Fork / rear shock
Wheels: 27.5″, 29″
Drivetrain: 1 × 10 32t / 11–48t
Gear range: 436%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 156–166
SM 163–174
MD 171–182
LG 179–189
XL 185–195

Components

15 of 21 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

29”, 6061 Alu, boost spacing, 135mm rear travel, 73mm BSA BB Not identified

Suspension

2 parts

Drivetrain

6 parts

Bottom bracket

73mm threaded BSA BB Not identified
Cassette
- Shimano CS-LG300-10 10 speeds 11–48t
CS-LG300-10CS-LG300
Chain
- Shimano CN-LG500
CN-LG500
Crankset
- Shimano Cues 32t
Rear derailleur
- Shimano Cues
RD-U600
Shifters
- Shimano Cues SL-U6000-10R 10 speeds
SL-U6000-10R

Brakes

1 part

Brakes
- Shimano BL-MT401
BL-MT401BL-MT410

Wheels and tires

4 parts

Front hub
- Shimano HB-TC500-15-B
HB-TC500-15
Rear hub
- Shimano FH-TC500-HM-B 11 speeds
FH-TC500-HM
Rims

30mm ID, tubeless ready Not identified
Tires
- Maxxis Minion

Cockpit and contact points

7 parts

Grips
- Calibre
Handlebar

780mm wide, 20mm rise, 3deg upsweep, 6deg backsweep, bar bore 31.8mm Not identified
Headset
- FSA NO.57E
Pedals

Flat pedals Not identified
Saddle
- Calibre
Seatpost
- X-Fusion
Stem

45mm extension, 31.8mm clamp Not identified

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 450mm

Stack 630mm

Wheelbase 1222mm

Head angle 64.5°

Seat angle 78.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	420	425	450	475	500
Stackmm	596	626	630	635	639
Top tube lengthmm	547	558	584	610	636
Seat tube lengthmm	390	390	415	440	460
Head tube lengthmm	110	110	115	120	125
Head tube angle	64.5°	64.5°	64.5°	64.5°	64.5°
Seat tube angle	78°	78°	78°	78°	78°
Chainstay lengthmm	425	445	445	445	445
Wheelbasemm	1156	1195	1222	1250	1277
Front centermm	732	753	780	808	834
Bottom bracket dropmm	28	38	38	38	38
Bottom bracket heightmm	327	336	336	336	336
Fork rakemm	37	42	42	42	42
Trailmm	129	132	132	132	132
Stack/reach ratio	1.42	1.47	1.40	1.34	1.28
Suspension and parts
Dropper post travelmm	125	125	150	170	170

Not published by the manufacturer: Standover height, Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle and Seatpost length.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum

Suspension

Suspension configuration: Full suspension
Front travel: 140 mm
Rear travel: 135 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 48
Lowest gear: 19.3 in
Highest gear: 84.4 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Air
Tire width: 2.5″
Wheel material: Aluminum
Wheel size: 27.5″, 29″

Technical analysis

4 measures

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

Front travel

140 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,810 bicycles with this information
Coverage: 97.5% of the class

Lowest gear

19.3 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Highest gear

84.4 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Shifting

Mechanical

388 of 1,849 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,849 bicycles with this information
Coverage: 99.6% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.4 km/h
Highest gear: 32.3 km/h

Total gear range 436%

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: 19.3–84.4 gear inches
Class reference (p10–p90): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2025
Lowest gear: 1384 bicycles with this information, 74.6% of the class
Highest gear: 1384 bicycles with this information, 74.6% 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.

Changes since 2024

Changes since 2024
Specification	2024 Calibre Bossnut	This bicycle Calibre Bossnut
Frame
Fork material	Aluminum	Not informed
Bicycle weight	15.2 kg	Not informed
Suspension
Front travel	130 mm	140 mm
Rear travel	130 mm	135 mm
Drivetrain
Rear sprockets	12	10
Largest sprocket	50	48
Lowest gear	17.6 in	19.3 in
Highest gear	80.0 in	84.4 in
Cockpit
Seatpost	Rigid seatpost	Dropper seatpost
Other specifications
Tire width	2.3″	2.5″
Wheel size	27.5″	27.5″ / 29″
Bottom bracket standard	Not informed	BSA