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Bossnut

2025 Calibre Bikes Bossnut Base

Category
Full-suspension Trail MTB
Design
Flat Bar, Full suspension
Frame
Aluminum
Suspension
140mm fork travel, 135mm rear travel
Features
Disc brake
XS
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I've Ridden
S
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M
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L
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XL
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Average stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Somewhat upright stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Somewhat upright stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Average stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Average stack and reachvs category
Suspension sag unknown
Geometry may mis-represent actual riding geometry

Geometry

XS
S
M
L
XL
Stack
596mm
626mm
630mm
635mm
639mm
Reach
420mm
425mm
450mm
475mm
500mm
Stack to Reach Ratio
1.42:1
1.47:1
1.4:1
1.34:1
1.28:1
Seat Tube Length, Unknown
390mm
390mm
415mm
440mm
460mm
Top Tube Length, Effective/Horizontal Unknown
547mm
558mm
584mm
610mm
636mm
Top Tube Slope
23.2deg
25.8deg
22.7deg
19.9deg
17.6deg
Head Tube Angle
64.5deg
64.5deg
64.5deg
64.5deg
64.5deg
Seat Tube Angle
78deg
78deg
78deg
78deg
78deg
Effective Seat Tube Angle, ETT HT Top
72deg
72deg
72deg
72deg
72deg
Head Tube Length
110mm
110mm
115mm
120mm
125mm
Bottom Bracket Drop
28mm
38mm
38mm
38mm
38mm
Bottom Bracket Height
325mm
334mm
334mm
334mm
334mm
Chainstay Length
425mm
445mm
445mm
445mm
445mm
Chainstay Length Horizontal
424.1mm
443.4mm
443.4mm
443.4mm
443.4mm
Front-Center
732.5mm
752.6mm
779.6mm
807.5mm
834.5mm
Front-Center Horizontal
731.9mm
751.6mm
778.6mm
806.6mm
833.6mm
Wheelbase
1156mm
1195mm
1222mm
1250mm
1277mm
Fork Offset/Rake
42mm
42mm
42mm
42mm
42mm
Fork Length, Unknown
140mm
140mm
140mm
140mm
140mm
Trail
121.8mm
very high
130.9mm
very high
130.9mm
very high
130.9mm
very high
130.9mm
very high
Mechanical Trail
110mm
118.1mm
118.1mm
118.1mm
118.1mm
Wheel Flop
47.3mm
50.9mm
50.9mm
50.9mm
50.9mm
Tire to Pedal Spindle
209.5mm
170 mm cranks
210.6mm
170 mm cranks
237.6mm
170 mm cranks
265.6mm
170 mm cranks
292.5mm
170 mm cranks
Pedal Spindle to Ground Clearance
155mm
170 mm cranks
164mm
170 mm cranks
164mm
170 mm cranks
164mm
170 mm cranks
164mm
170 mm cranks

Base Build

XS
S
M
L
XL
Wheel Size
650B/27.5 in
584 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
Tire Width
2.4in
2.4in
2.4in
2.4in
2.4in
Tire Outer Diameter
705.9mm
743.9mm
743.9mm
743.9mm
743.9mm
Bike Length with Tires
1861.9mm
1938.9mm
1965.9mm
1993.9mm
2020.9mm
Crank Length
170mm
170mm
170mm
170mm
170mm
Handlebar Width
780mm
780mm
780mm
780mm
780mm

Published Sizing Recommendations

Height
5 ft 6 in
to
5 ft 9 in
5 ft 6 in
to
5 ft 10 in
5 ft 8 in
to
6 ft 0 in
5 ft 10 in
to
6 ft 2 in
6 ft 1 in
to
6 ft 6 in

Stack and Reach vs. Category Trend

Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Learn more about the Upright/Aggressive Scale
Category Trend
Full-suspension Trail MTB
Source:https://www.pinkbike.com/news/review-calibre-bossnut-2025.html#geometry
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