Name: 2025 Isaac Cycle Boson Base
Brand: Isaac Cycle

	S	M	L	XL	XXL
Stack	538.5mm	564.8mm	576.7mm	590.5mm	614.4mm
Reach	368.3mm	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	455mm	496mm	526mm	539mm	565mm
Top Tube Length, Effective/Horizontal Unknown	512.6mm	551.5mm	564.3mm	577mm	601.6mm
Top Tube Slope	11.5deg	9.5deg	7.5deg	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	142.4mm	160.2mm	172.6mm	185.2mm	210.1mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm	70mm
Bottom Bracket Height	271mm	271mm	271mm	271mm	271mm
Chainstay Length	410mm	410mm	410mm	410mm	410mm
Chainstay Length Horizontal	404mm	404mm	404mm	404mm	404mm
Front-Center	586.7mm	592mm	605mm	607.3mm	631.7mm
Front-Center Horizontal	582.5mm	587.8mm	600.9mm	603.2mm	627.8mm
Wheelbase	986.5mm	991.8mm	1004.9mm	1007.2mm	1031.8mm
Fork Offset/Rake	50mm	45mm	45mm	45mm	45mm
Fork Length, Unknown	371mm	371mm	371mm	371mm	371mm
Trail	64.5mm mid/neutral	57.2mm mid/neutral	57.2mm mid/neutral	54.1mm mid/neutral	54.1mm mid/neutral
Mechanical Trail	61mm	54.7mm	54.7mm	51.9mm	51.9mm
Wheel Flop	19.9mm	16mm	16mm	14.7mm	14.7mm
Standover Height	755.5mm	788.6mm	809.1mm	822.8mm	846.8mm
Tire to Pedal Spindle	75.7mm 170 mm cranks	81mm 170 mm cranks	94mm 170 mm cranks	96.3mm 170 mm cranks	120.7mm 170 mm cranks
Pedal Spindle to Ground Clearance	101mm 170 mm cranks	101mm 170 mm cranks	101mm 170 mm cranks	101mm 170 mm cranks	101mm 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-mineral-white-m--r7150-di2--50-34--four-rd/75591/

2025 Isaac Cycle Boson Base

Geometry