2023 POSST Object Base

	50	52	54	56	58
Stack	530mm	540mm	560mm	580mm	600mm
Reach	375mm	380mm	384mm	389mm	397mm
Stack to Reach Ratio	1.41:1	1.42:1	1.46:1	1.49:1	1.51:1
Seat Tube Length, C-T	450mm	480mm	520mm	540mm	560mm
Top Tube Length, Effective/Horizontal HT Top	512mm	525mm	541mm	561mm	575mm
Top Tube Slope	11deg	8.6deg	6.5deg	6.6deg	6.5deg
Head Tube Angle	71deg	71.5deg	72.2deg	73deg	73.5deg
Seat Tube Angle	75.5deg	75deg	74.3deg	73.5deg	73.5deg
Head Tube Length	115mm	124mm	144mm	162mm	181mm
Bottom Bracket Drop	77mm	77mm	75mm	75mm	75mm
Bottom Bracket Height	262mm	262mm	264mm	264mm	264mm
Chainstay Length	415mm	415mm	415mm	415mm	415mm
Chainstay Length Horizontal	407.8mm	407.8mm	408.2mm	408.2mm	408.2mm
Front-Center	581mm	585mm	590mm	593mm	602mm
Front-Center Horizontal	576.2mm	580.2mm	584.8mm	588.8mm	606.8mm
Wheelbase	984mm	988mm	993mm	997mm	1015mm
Fork Offset/Rake	43mm	43mm	43mm	43mm	43mm
Fork Length, Unknown	367mm	367mm	367mm	367mm	367mm
Trail	71.3mm high	68.1mm high	63.7mm mid/neutral	58.7mm mid/neutral	55.6mm mid/neutral
Mechanical Trail	67.4mm	64.6mm	60.6mm	56.1mm	53.3mm
Wheel Flop	21.9mm	20.5mm	18.5mm	16.4mm	15.1mm
Standover Height	712mm	735mm	769mm	787mm	807mm
Tire to Pedal Spindle	72mm 170 mm cranks	76mm 170 mm cranks	78.5mm 172.5 mm cranks	81.5mm 172.5 mm cranks	88mm 175 mm cranks
Pedal Spindle to Ground Clearance	92mm 170 mm cranks	92mm 170 mm cranks	91.5mm 172.5 mm cranks	91.5mm 172.5 mm cranks	89mm 175 mm cranks

Published Sizing Recommendations

Height	158 cm to 166 cm	166 cm to 173 cm	173 cm to 179 cm	178 cm to 183 cm	182 cm to 187 cm
PBH	71 cm to 75 cm	74 cm to 78 cm	77 cm to 82 cm	80 cm to 84 cm	82 cm to 86 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.

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Source:https://www.posst.bike/object