	46cm (650b)	50m	53cm	56cm	59cm	62cm
Stack	510mm	538mm	569mm	603mm	628mm	646mm
Reach	364mm	369mm	375mm	375mm	392mm	401mm
Stack to Reach Ratio	1.4:1	1.46:1	1.52:1	1.61:1	1.6:1	1.61:1
Seat Tube Length, C-T	460mm	500mm	530mm	560mm	590mm	620mm
Top Tube Length, Effective/Horizontal Center	505mm	520mm	540mm	560mm	585mm	605mm
Top Tube Slope	7.8deg	6.4deg	6.5deg	7.1deg	6.5deg	5.3deg
Head Tube Angle	70deg	71deg	71.5deg	71.5deg	72deg	72deg
Seat Tube Angle	74.5deg	74.5deg	74deg	73deg	73deg	72.5deg
Head Tube Length	90mm	95mm	125mm	160mm	185mm	205mm
Bottom Bracket Drop	72mm	76mm	76mm	76mm	74mm	74mm
Bottom Bracket Height	268mm	283mm	283mm	283mm	285mm	285mm
Chainstay Length	428mm	432mm	432mm	432mm	432mm	432mm
Chainstay Length Horizontal	421.9mm	425.3mm	425.3mm	425.3mm	425.6mm	425.6mm
Front-Center	591mm	591mm	603mm	614mm	629mm	644mm
Front-Center Horizontal	587.1mm	585.7mm	597.7mm	608.7mm	624.4mm	639.4mm
Wheelbase	1009mm	1011mm	1023mm	1034mm	1050mm	1065mm
Fork Offset/Rake	60mm	55mm	55mm	55mm	50mm	50mm
Fork Length (On-Axis)	385mm	400mm	400mm	400mm	400mm	400mm
Trail	59.9mm mid/neutral	65.4mm high	62.1mm mid/neutral	62.1mm mid/neutral	64.1mm mid/neutral	64.1mm mid/neutral
Mechanical Trail	56.3mm	61.9mm	58.9mm	58.9mm	60.9mm	60.9mm
Wheel Flop	19.3mm	20.2mm	18.7mm	18.7mm	18.8mm	18.8mm
Standover Height	727mm	769mm	796mm	823mm	852mm	875mm
Tire to Pedal Spindle	81mm 170 mm cranks	62mm 170 mm cranks	74mm 170 mm cranks	85mm 170 mm cranks	100mm 170 mm cranks	115mm 170 mm cranks
Pedal Spindle to Ground Clearance	98mm 170 mm cranks	113mm 170 mm cranks	113mm 170 mm cranks	113mm 170 mm cranks	115mm 170 mm cranks	115mm 170 mm cranks

	46cm (650b)	50m	53cm	56cm	59cm	62cm
Wheel Size	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	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	48mm	48mm	48mm	48mm	48mm	48mm
Tire Width Max	50mm	50mm	50mm	50mm	50mm	50mm
Tire Outer Diameter	680mm	718mm	718mm	718mm	718mm	718mm
Bike Length with Tires	1689mm	1729mm	1741mm	1752mm	1768mm	1783mm

Published Sizing Recommendations

Height

—

5 ft 1 in

5 ft 5 in

5 ft 4 in

5 ft 8 in

5 ft 7 in

5 ft 11 in

5 ft 10 in

6 ft 1 in

6 ft 4 in

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/monstercross-tech-info/

2026 (V6) Black Mountain Cycles Monster Cross (Rim Brake) Base