2021 Pure Bros Gravel Bike Expedition

	S	M	L	XL	XXL
Stack	545mm	564mm	585mm	606mm	625mm
Reach	376mm	382mm	394mm	410mm	418mm
Stack to Reach Ratio	1.45:1	1.48:1	1.48:1	1.48:1	1.5:1
Seat Tube Length, C-T	520mm	540mm	560mm	580mm	600mm
Top Tube Length, Effective/Horizontal Center	538mm	550mm	570mm	590mm	610mm
Top Tube Slope	5.1deg	4.9deg	5deg	5deg	4.9deg
Head Tube Angle	71.5deg	71.5deg	72deg	72.5deg	72.5deg
Seat Tube Angle	73.5deg	73.5deg	73.5deg	73.5deg	73deg
Head Tube Length	110mm	130mm	150mm	170mm	190mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm	70mm
Bottom Bracket Height	281mm	281mm	281mm	281mm	281mm
Chainstay Length	428mm	428mm	428mm	428mm	428mm
Chainstay Length Horizontal	422.2mm	422.2mm	422.2mm	422.2mm	422.2mm
Front-Center	591.9mm	604.8mm	617.7mm	635.6mm	649.6mm
Front-Center Horizontal	587.8mm	600.8mm	613.8mm	631.8mm	645.8mm
Wheelbase	1010mm	1023mm	1036mm	1054mm	1068mm
Fork Offset/Rake	50.1mm	50.7mm	49.9mm	50.3mm	50.3mm
Trail	64.6mm mid/neutral	64mm mid/neutral	61.6mm mid/neutral	57.9mm mid/neutral	57.9mm mid/neutral
Mechanical Trail	61.3mm	60.7mm	58.6mm	55.2mm	55.2mm
Wheel Flop	19.4mm	19.3mm	18.1mm	16.6mm	16.6mm
Tire to Pedal Spindle	70.9mm 170 mm cranks	83.8mm 170 mm cranks	96.7mm 170 mm cranks	114.6mm 170 mm cranks	128.6mm 170 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks

Published Sizing Recommendations

Height	162 cm to 172 cm	172 cm to 182 cm	182 cm to 188 cm	188 cm to 194 cm	194 cm to 200 cm
PBH	75 cm to 79 cm	79 cm to 84 cm	83 cm to 89 cm	87 cm to 93 cm	91 cm to 97 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:https://www.finest-limited-cycles.com/stahlrahmen-gravel-bike-expedition/