2025 Bassi x Keystone Belmont Base

	48.5cm	53.5cm	57.5cm	61.5cm
Stack	545mm	565mm	600mm	643mm
Reach	364mm	380mm	386mm	396mm
Stack to Reach Ratio	1.5:1	1.49:1	1.55:1	1.62:1
Seat Tube Length, C-T	485mm	535mm	575mm	615mm
Top Tube Length, Effective/Horizontal Center	525mm	547mm	564mm	587mm
Top Tube Slope	9.1deg	5.6deg	5.1deg	5.3deg
Head Tube Angle	70.5deg	71deg	71.5deg	71.5deg
Seat Tube Angle	73.5deg	73.5deg	73.5deg	73.5deg
Head Tube Length	106.6mm	125.6mm	160.5mm	205.8mm
Bottom Bracket Drop	67mm	67mm	67mm	67mm
Bottom Bracket Height	273mm	273mm	273mm	273mm
Chainstay Length	430mm	430mm	440mm	440mm
Chainstay Length Horizontal	424.8mm	424.8mm	434.9mm	434.9mm
Front-Center	595.4mm	613.3mm	625.9mm	650.2mm
Front-Center Horizontal	591.6mm	609.6mm	622.3mm	646.7mm
Wheelbase	1016.4mm	1034.4mm	1057.2mm	1081.6mm
Fork Offset/Rake	55mm	55mm	55mm	55mm
Fork Length (On-Axis)	400mm	400mm	400mm	400mm
Trail	62.1mm mid/neutral	58.9mm mid/neutral	55.8mm mid/neutral	55.8mm mid/neutral
Mechanical Trail	58.5mm	55.7mm	52.9mm	52.9mm
Wheel Flop	19.5mm	18.1mm	16.8mm	16.8mm
Tire to Pedal Spindle	85.4mm 170 mm cranks	103.3mm 170 mm cranks	115.9mm 170 mm cranks	140.2mm 170 mm cranks
Pedal Spindle to Ground Clearance	103mm 170 mm cranks	103mm 170 mm cranks	103mm 170 mm cranks	103mm 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://keystone-bicycle-co.shoplightspeed.com/bassi-x-keystone-belmont-frameset.html

Geometry