2025 OPEN Cycle U.P. Base

	S	M	L	XL
Stack	522mm	551mm	580mm	604mm
Reach	365mm	376mm	387mm	401mm
Stack to Reach Ratio	1.43:1	1.47:1	1.5:1	1.51:1
Seat Tube Length, C-T	520mm	540mm	560mm	580mm
Top Tube Length, Effective/Horizontal HT Top	528mm	549mm	570mm	591mm
Top Tube Slope	2.9deg	3.8deg	4.7deg	5.1deg
Head Tube Angle	69.5deg	71deg	72.5deg	72.5deg
Seat Tube Angle	72.5deg	72.5deg	72.5deg	72.5deg
Head Tube Length	105mm	130mm	155mm	180mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm
Bottom Bracket Height	281mm	281mm	281mm	281mm
Chainstay Length	420mm	420mm	420mm	420mm
Chainstay Length Horizontal	414.1mm	414.1mm	414.1mm	414.1mm
Front-Center	592mm	598mm	604mm	622mm
Front-Center Horizontal	587.9mm	593.9mm	599.9mm	617.9mm
Wheelbase	1002mm	1008mm	1014mm	1032mm
Fork Offset/Rake	50mm	50mm	50mm	50mm
Trail	77.9mm high	68mm high	58.2mm mid/neutral	58.2mm mid/neutral
Mechanical Trail	72.9mm	64.3mm	55.6mm	55.6mm
Wheel Flop	25.5mm	20.9mm	16.7mm	16.7mm
Standover Height	743mm	767mm	791mm	815mm
Tire to Pedal Spindle	71mm 170 mm cranks	77mm 170 mm cranks	83mm 170 mm cranks	101mm 170 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks

Published Sizing Recommendations

Height

5 ft 2 in

5 ft 8 in

5 ft 7 in

5 ft 11 in

5 ft 10 in

6 ft 3 in

6 ft 2 in

6 ft 7 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.

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Source:https://opencycle.com/new-upper