2021 Isaac Cycle Boson Disc

	49	52	55	58	61
Stack	538.5mm	564.8mm	576.7mm	590.5mm	614.4mm
Reach	368mm	389.5mm	398.9mm	402.1mm	419.6mm
Stack to Reach Ratio	1.46:1	1.45:1	1.45:1	1.47:1	1.46:1
Seat Tube Length, C-T	454.8mm	496.4mm	526.2mm	539mm	565mm
Seat Tube Length, C-C	438mm	477.7mm	509.6mm	522.7mm	544.9mm
Top Tube Length, Effective/Horizontal HT Top	505.9mm	545mm	557.9mm	570mm	594.8mm
Top Tube Slope	11.5deg	9.5deg	7.4deg	7.6deg	7.1deg
Head Tube Angle	71deg	73deg	73deg	73.5deg	73.5deg
Seat Tube Angle	75deg	74deg	74deg	73.5deg	73.5deg
Head Tube Length	144mm	164mm	176.5mm	189mm	214mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm	70mm
Bottom Bracket Height	266mm	266mm	266mm	266mm	266mm
Chainstay Length	406mm	406mm	406mm	406mm	406mm
Chainstay Length Horizontal	399.9mm	399.9mm	399.9mm	399.9mm	399.9mm
Front-Center	581.4mm	592mm	608mm	607.3mm	631.9mm
Front-Center Horizontal	577.2mm	587.9mm	604mm	603.3mm	628mm
Wheelbase	977.1mm	987.8mm	1003.9mm	1003.2mm	1027.9mm
Fork Offset/Rake	45mm	45mm	45mm	45mm	45mm
Fork Length (Axle-To-Crown)	366mm	366mm	366mm	366mm	366mm
Trail	68.1mm high	55.7mm mid/neutral	55.7mm mid/neutral	52.6mm mid/neutral	52.6mm mid/neutral
Mechanical Trail	64.4mm	53.2mm	53.2mm	50.4mm	50.4mm
Wheel Flop	21mm	15.6mm	15.6mm	14.3mm	14.3mm
Standover Height	711mm	748.9mm	777.7mm	789mm	813.3mm
Tire to Pedal Spindle	75.4mm 170 mm cranks	86mm 170 mm cranks	102mm 170 mm cranks	101.3mm 170 mm cranks	125.9mm 170 mm cranks
Pedal Spindle to Ground Clearance	96mm 170 mm cranks	96mm 170 mm cranks	96mm 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.isaac-cycle.com/en_US/p/bike-boson-disc--sram-force-etap-axs/54737/

Geometry