2025 Black Mountain Cycles Mod.Zero Base

	47cm	47cm	50cm	50cm	53cm	56cm	59cm
Stack	588mm	588mm	607mm	607mm	627mm	646mm	665mm
Reach	366mm	366mm	370mm	370mm	383mm	391mm	405mm
Stack to Reach Ratio	1.61:1	1.61:1	1.64:1	1.64:1	1.64:1	1.65:1	1.64:1
Seat Tube Length, C-T	470mm	470mm	500mm	500mm	530mm	560mm	590mm
Top Tube Length, Effective/Horizontal Unknown	540mm	540mm	555mm	555mm	575mm	595mm	615mm
Top Tube Slope	15.4deg	15.4deg	14deg	14deg	12.6deg	11.3deg	10deg
Head Tube Angle	71.5deg	71.5deg	71.5deg	71.5deg	72deg	72deg	72deg
Seat Tube Angle	73deg	73deg	73deg	73deg	73deg	72.5deg	72.5deg
Head Tube Length	140mm	140mm	160mm	160mm	180mm	200mm	220mm
Bottom Bracket Drop	72mm	72mm	72mm	72mm	70mm	70mm	70mm
Bottom Bracket Height	265mm	265mm	265mm	265mm	291mm	291mm	291mm
Chainstay Length	438mm	438mm	438mm	438mm	438mm	438mm	438mm
Chainstay Length Horizontal	432mm	432mm	432mm	432mm	432.4mm	432.4mm	432.4mm
Front-Center	601mm	601mm	611mm	611mm	621mm	635mm	655mm
Front-Center Horizontal	597mm	597mm	607mm	607mm	616.6mm	630.6mm	651.6mm
Wheelbase	1029mm	1029mm	1039mm	1039mm	1049mm	1063mm	1084mm
Fork Offset/Rake	55mm	55mm	55mm	55mm	50mm	50mm	50mm
Fork Length, Unknown	410mm	410mm	410mm	410mm	410mm	410mm	410mm
Trail	54.8mm mid/neutral	54.8mm mid/neutral	54.8mm mid/neutral	54.8mm mid/neutral	64.7mm mid/neutral	64.7mm mid/neutral	64.7mm mid/neutral
Mechanical Trail	51.9mm	51.9mm	51.9mm	51.9mm	61.6mm	61.6mm	61.6mm
Wheel Flop	16.5mm	16.5mm	16.5mm	16.5mm	19mm	19mm	19mm
Standover Height	778mm	778mm	802mm	802mm	828mm	851mm	875mm
Tire to Pedal Spindle	94mm 170 mm cranks	94mm 170 mm cranks	104mm 170 mm cranks	104mm 170 mm cranks	90mm 170 mm cranks	104mm 170 mm cranks	124mm 170 mm cranks
Pedal Spindle to Ground Clearance	95mm 170 mm cranks	95mm 170 mm cranks	95mm 170 mm cranks	95mm 170 mm cranks	121mm 170 mm cranks	121mm 170 mm cranks	121mm 170 mm cranks

	47cm	47cm	50cm	50cm	53cm	56cm	59cm
Wheel Size	650B/27.5 in 584 mm BSD	650B/27.5 in 584 mm BSD	650B/27.5 in 584 mm BSD	650B/27.5 in 584 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	45mm	45mm	45mm	45mm	50mm	50mm	50mm
Tire Outer Diameter	674mm	674mm	674mm	674mm	722mm	722mm	722mm
Bike Length with Tires	1703mm	1703mm	1713mm	1713mm	1771mm	1785mm	1806mm

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.

Learn more about the Upright/Aggressive Scale

Category Trend

All-road/Gravel

Source:https://blackmtncycles.com/info/frame-geometry-charts/, https://blackmtncycles.com/mod-zero-tech-info/

Suggest Bike Edit

2025 Black Mountain Cycles Mod.Zero Base

Geometry

Base Build

Stack and Reach vs. Category Trend