2020 roll: Bicycle Company A:1R Base

	Size 1	Size 2	Size 3
Stack	582.3mm	607.9mm	631.6mm
Reach	388.3mm	394.8mm	402.6mm
Stack to Reach Ratio	1.5:1	1.54:1	1.57:1
Seat Tube Length, C-TTT	430mm	485mm	540mm
Top Tube Length, Actual C-C	580mm	600mm	620mm
Head Tube Angle	70.5deg	71deg	71deg
Seat Tube Angle	72deg	71.5deg	71deg
Head Tube Length	145mm	170mm	195mm
Bottom Bracket Drop	60mm	60mm	60mm
Bottom Bracket Height	291mm	291mm	291mm
Chainstay Length	450mm	450mm	450mm
Chainstay Length Horizontal	446mm	446mm	446mm
Front-Center	623.9mm	633.9mm	649.8mm
Front-Center Horizontal	621mm	631mm	647mm
Wheelbase	1067mm	1077mm	1093mm
Fork Offset/Rake	45mm	45mm	45mm
Fork Length (On-Axis)	405mm	405mm	405mm
Trail	76.6mm high	73.3mm high	73.3mm high
Mechanical Trail	72.2mm	69.3mm	69.3mm
Wheel Flop	24.1mm	22.6mm	22.6mm
Standover Height	710mm	755mm	795mm
Tire to Pedal Spindle	102.9mm 170 mm cranks	112.9mm 170 mm cranks	128.8mm 170 mm cranks
Pedal Spindle to Ground Clearance	121mm 170 mm cranks	121mm 170 mm cranks	121mm 170 mm cranks

Published Sizing Recommendations

Height

5 ft 0 in

5 ft 5 in

5 ft 6 in

5 ft 11 in

6 ft 0 in

6 ft 4 in

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:https://www.rollbicycles.com/pages/bike-geometry