2023 POSST Oban Base

	50	52	54	56	58
Stack	525mm	537mm	555mm	575mm	595mm
Reach	376mm	383mm	390mm	390mm	404mm
Stack to Reach Ratio	1.4:1	1.4:1	1.42:1	1.47:1	1.47:1
Seat Tube Length, C-T	460mm	490mm	520mm	540mm	560mm
Top Tube Length, Effective/Horizontal HT Top	512mm	527mm	544mm	560mm	580mm
Top Tube Slope	9.2deg	7.1deg	5.8deg	6deg	5.9deg
Head Tube Angle	71.5deg	72deg	73deg	73deg	73.5deg
Seat Tube Angle	75.5deg	75deg	74.5deg	73.5deg	73.5deg
Head Tube Length	110mm	123mm	138mm	161mm	180mm
Bottom Bracket Drop	72mm	70mm	70mm	68mm	68mm
Bottom Bracket Height	267mm	269mm	269mm	271mm	271mm
Chainstay Length	410mm	410mm	410mm	412mm	412mm
Chainstay Length Horizontal	403.6mm	404mm	404mm	406.4mm	406.4mm
Front-Center	577mm	584mm	587mm	594mm	609mm
Front-Center Horizontal	573.4mm	580mm	583mm	589.7mm	604.7mm
Wheelbase	977mm	984mm	987mm	996mm	1011mm
Fork Offset/Rake	43mm	43mm	43mm	43mm	43mm
Fork Length, Unknown	370mm	370mm	370mm	370mm	370mm
Trail	68.1mm high	64.9mm mid/neutral	58.7mm mid/neutral	58.7mm mid/neutral	55.6mm mid/neutral
Mechanical Trail	64.6mm	61.8mm	56.1mm	56.1mm	53.3mm
Wheel Flop	20.5mm	19.1mm	16.4mm	16.4mm	15.1mm
Standover Height	740mm	762mm	788mm	808mm	828mm
Tire to Pedal Spindle	73mm 165 mm cranks	75mm 170 mm cranks	75.5mm 172.5 mm cranks	82.5mm 172.5 mm cranks	95mm 175 mm cranks
Pedal Spindle to Ground Clearance	102mm 165 mm cranks	99mm 170 mm cranks	96.5mm 172.5 mm cranks	98.5mm 172.5 mm cranks	96mm 175 mm cranks

Published Sizing Recommendations

Height

158 cm

166 cm

173 cm

179 cm

178 cm

183 cm

182 cm

187 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.posst.bike/oban