2024 Bona Bikes G31A Base

Design
Drop Bar, Rigid, non-suspension corrected
Frame
Titanium
Somewhat upright stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category

Geometry

460 (S)
480 (M)
510 (L)
540 (XL)
Stack
552mm
577mm
589mm
605mm
Reach
361mm
378.5mm
385mm
390mm
Stack to Reach Ratio
1.53:1
1.52:1
1.53:1
1.55:1
Seat Tube Length, C-T
460mm
480mm
510mm
540mm
Top Tube Length, Effective/Horizontal Unknown
530mm
555mm
565mm
575mm
Top Tube Slope
12.8deg
12.8deg
10.7deg
9.2deg
Head Tube Angle
70deg
71deg
71.5deg
72deg
Seat Tube Angle
73deg
73deg
73deg
73deg
Head Tube Length
120mm
145mm
155mm
170mm
Bottom Bracket Drop
72mm
72mm
72mm
72mm
Bottom Bracket Height
284mm
284mm
284mm
284mm
Chainstay Length
440mm
440mm
440mm
440mm
Chainstay Length Horizontal
434.1mm
434.1mm
434.1mm
434.1mm
Front-Center
588mm
605mm
610mm
615mm
Front-Center Horizontal
584.9mm
600.9mm
606.9mm
611.9mm
Wheelbase
1019mm
1035mm
1041mm
1046mm
Fork Offset/Rake
45mm
45mm
45mm
45mm
Fork Length, Unknown
407mm
407mm
407mm
407mm
Trail
81.7mm
very high
75mm
high
71.7mm
high
68.4mm
high
Mechanical Trail
76.8mm
70.9mm
68mm
65mm
Wheel Flop
26.3mm
23.1mm
21.6mm
20.1mm
Standover Height
704mm
719mm
745mm
771mm
Tire to Pedal Spindle
62mm
170 mm cranks
79mm
170 mm cranks
84mm
170 mm cranks
89mm
170 mm cranks
Pedal Spindle to Ground Clearance
114mm
170 mm cranks
114mm
170 mm cranks
114mm
170 mm cranks
114mm
170 mm cranks

Base Build

460 (S)
480 (M)
510 (L)
540 (XL)
Wheel Size
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
45mm
45mm
45mm
45mm
Tire Width Max
45mm
45mm
45mm
45mm
Tire Outer Diameter
712mm
712mm
712mm
712mm
Bike Length with Tires
1731mm
1747mm
1753mm
1758mm

Published Sizing Recommendations

Height
158 cm
to
168 cm
165 cm
to
175 cm
170 cm
to
180 cm
178 cm
to
188 cm

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
All-road/Gravel
Source:http://www.bonabike.com/goods/Gr9-Titanium-Gravel-Road-Bike-Frame-700CX45C