2022 Sour Bicycles Big Fun Base

	S	M	L	XL
Stack	620mm	629.4mm	638.4mm	647.3mm
Reach	440mm	465mm	490mm	525mm
Stack to Reach Ratio	1.41:1	1.35:1	1.3:1	1.23:1
Seat Tube Length, Unknown	370mm	400mm	430mm	470mm
Top Tube Length, Effective/Horizontal Unknown	578mm	605mm	631mm	668mm
Top Tube Slope	26.3deg	23.3deg	20.5deg	16.7deg
Head Tube Angle	63.5deg	63.5deg	63.5deg	63.5deg
Seat Tube Angle	76.5deg	76.5deg	76.5deg	76.5deg
Head Tube Length	90mm	100mm	110mm	120mm
Bottom Bracket Drop	62.5mm	62.5mm	62.5mm	62.5mm
Bottom Bracket Height	314.5mm	314.5mm	314.5mm	314.5mm
Chainstay Length	430mm	430mm	430mm	430mm
Chainstay Length Horizontal	425.4mm	425.4mm	425.4mm	425.4mm
Front-Center	767.1mm	797mm	825.9mm	864.8mm
Front-Center Horizontal	764.6mm	794.6mm	823.6mm	862.6mm
Wheelbase	1190mm	1220mm	1249mm	1288mm
Fork Offset/Rake	51mm	51mm	51mm	51mm
Fork Length, Unknown	551mm	551mm	551mm	551mm
Trail	131mm very high	131mm very high	131mm very high	131mm very high
Mechanical Trail	117.2mm	117.2mm	117.2mm	117.2mm
Wheel Flop	52.3mm	52.3mm	52.3mm	52.3mm
Tire to Pedal Spindle	220.1mm 170 mm cranks	250mm 170 mm cranks	278.9mm 170 mm cranks	317.8mm 170 mm cranks
Pedal Spindle to Ground Clearance	144.5mm 170 mm cranks	144.5mm 170 mm cranks	144.5mm 170 mm cranks	144.5mm 170 mm cranks

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://sour.bike/en/please-welcome-the-big-fun/

Geometry