2025 Black Mountain Cycles Road Base

	50	53	56	59
Stack	530mm	561mm	581mm	600mm
Reach	363mm	375mm	388mm	399mm
Stack to Reach Ratio	1.46:1	1.5:1	1.5:1	1.5:1
Seat Tube Length, C-T	500mm	530mm	560mm	590mm
Top Tube Length, Effective/Horizontal Unknown	515mm	537mm	560mm	582mm
Top Tube Slope	5.5deg	5.7deg	4.6deg	3.6deg
Head Tube Angle	71.5deg	72deg	73deg	73deg
Seat Tube Angle	74.5deg	74deg	73.5deg	73deg
Head Tube Length	115mm	135mm	155mm	175mm
Bottom Bracket Drop	78mm	78mm	75mm	75mm
Bottom Bracket Height	265mm	265mm	268mm	268mm
Chainstay Length	428mm	428mm	428mm	428mm
Chainstay Length Horizontal	420.8mm	420.8mm	421.4mm	421.4mm
Front-Center	576mm	589mm	597mm	614mm
Front-Center Horizontal	570.2mm	584.2mm	592.6mm	609.6mm
Wheelbase	991mm	1005mm	1014mm	1031mm
Fork Offset/Rake	50mm	50mm	48mm	48mm
Fork Length, Unknown	375mm	375mm	375mm	375mm
Trail	62mm mid/neutral	58.9mm mid/neutral	54.7mm mid/neutral	54.7mm mid/neutral
Mechanical Trail	58.8mm	56mm	52.3mm	52.3mm
Wheel Flop	18.7mm	17.3mm	15.3mm	15.3mm
Standover Height	752mm	777mm	804mm	827mm
Tire to Pedal Spindle	63mm 170 mm cranks	76mm 170 mm cranks	84mm 170 mm cranks	101mm 170 mm cranks
Pedal Spindle to Ground Clearance	95mm 170 mm cranks	95mm 170 mm cranks	98mm 170 mm cranks	98mm 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://blackmtncycles.com/road-25-tech-info/

Geometry