2019 Pure Bros Gravel Bike Base

	S	M	L	XL
Stack	543mm	564mm	585mm	606mm
Reach	371mm	379mm	387mm	395mm
Stack to Reach Ratio	1.46:1	1.49:1	1.51:1	1.53:1
Seat Tube Length, C-T	520mm	540mm	560mm	580mm
Top Tube Length, Effective/Horizontal Center	543mm	550mm	570mm	590mm
Top Tube Slope	4.9deg	5.1deg	5.1deg	5.2deg
Head Tube Angle	71.5deg	71.5deg	72deg	72.5deg
Seat Tube Angle	73.5deg	73deg	73deg	73deg
Head Tube Length	110mm	130mm	150mm	170mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm
Bottom Bracket Height	279.3mm	279.3mm	279.3mm	279.3mm
Chainstay Length	420mm	425mm	425mm	425mm
Chainstay Length Horizontal	414.1mm	419.2mm	419.2mm	419.2mm
Front-Center	598mm	601.9mm	611.8mm	626.7mm
Front-Center Horizontal	593.9mm	597.8mm	607.8mm	622.8mm
Wheelbase	1008mm	1017mm	1027mm	1042mm
Fork Offset/Rake	61.3mm	50.8mm	50.9mm	56.1mm
Trail	52.3mm mid/neutral	63.3mm mid/neutral	60mm mid/neutral	51.3mm mid/neutral
Mechanical Trail	49.6mm	60.1mm	57.1mm	48.9mm
Wheel Flop	15.7mm	19.1mm	17.6mm	14.7mm
Tire to Pedal Spindle	78.7mm 170 mm cranks	82.6mm 170 mm cranks	92.6mm 170 mm cranks	107.5mm 170 mm cranks
Pedal Spindle to Ground Clearance	109.3mm 170 mm cranks	109.3mm 170 mm cranks	109.3mm 170 mm cranks	109.3mm 170 mm cranks

Published Sizing Recommendations

Height

13 ft 4 in

14 ft 2 in

15 ft 0 in

15 ft 10 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.finest-limited-cycles.com/stahlrahmen-gravel-bike/