2024 Bona Bikes G31A Base

	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

Published Sizing Recommendations

Height

158 cm

168 cm

165 cm

175 cm

170 cm

180 cm

178 cm

188 cm

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.

Category Trend

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