2022 Serk Titanium A21 650b wheels

	S	M	L	XL
Stack	548mm	575mm	597mm	619mm
Reach	364mm	377mm	390mm	403mm
Stack to Reach Ratio	1.51:1	1.53:1	1.53:1	1.54:1
Seat Tube Length, C-T	485mm	510mm	535mm	560mm
Top Tube Length, Effective/Horizontal HT Top	523mm	549mm	569mm	594mm
Top Tube Slope	9.3deg	9.4deg	8.8deg	8.4deg
Head Tube Angle	70deg	70deg	70deg	70deg
Seat Tube Angle	74deg	73.5deg	73.5deg	73deg
Head Tube Length	110mm	139mm	164mm	188mm
Bottom Bracket Drop	75mm	75mm	73mm	73mm
Bottom Bracket Height	264mm	264mm	266mm	266mm
Chainstay Length	430mm	430mm	430mm	430mm
Chainstay Length Horizontal	423.4mm	423.4mm	423.8mm	423.8mm
Front-Center	589mm	612mm	633mm	654mm
Front-Center Horizontal	584.6mm	606.6mm	628.2mm	649.2mm
Wheelbase	1008mm	1030mm	1052mm	1073mm
Fork Offset/Rake	45mm	45mm	45mm	45mm
Trail	75.5mm high	75.5mm high	75.5mm high	75.5mm high
Mechanical Trail	70.9mm	70.9mm	70.9mm	70.9mm
Wheel Flop	24.3mm	24.3mm	24.3mm	24.3mm
Tire to Pedal Spindle	80mm 170 mm cranks	103mm 170 mm cranks	124mm 170 mm cranks	145mm 170 mm cranks
Pedal Spindle to Ground Clearance	94mm 170 mm cranks	94mm 170 mm cranks	96mm 170 mm cranks	96mm 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://www.serk.cc/a21/

Geometry