	46	49	52	54	56	58	60	62	64
Stack	515mm	526mm	538mm	552mm	567mm	583mm	596mm	617mm	636mm
Reach	372mm	374mm	376mm	382mm	387mm	392mm	403mm	411mm	425mm
Stack to Reach Ratio	1.38:1	1.41:1	1.43:1	1.45:1	1.47:1	1.49:1	1.48:1	1.5:1	1.5:1
Seat Tube Length, C-T	440mm	460mm	480mm	500mm	515mm	530mm	545mm	565mm	585mm
Top Tube Length, Effective/Horizontal HT Top	505mm	515mm	525mm	540mm	555mm	565mm	580mm	600mm	620mm
Top Tube Slope	10.5deg	9.4deg	8.5deg	7.8deg	7.8deg	7.9deg	7.5deg	7.6deg	7.3deg
Head Tube Angle	71.5deg	72deg	72.5deg	73deg	73deg	73.5deg	73.5deg	74deg	74deg
Seat Tube Angle	75.5deg	75deg	74.5deg	74deg	73.5deg	73.5deg	73.5deg	73deg	73deg
Head Tube Length	110mm	120mm	130mm	145mm	160mm	175mm	190mm	210mm	230mm
Bottom Bracket Drop	74mm	74mm	74mm	73mm	73mm	73mm	72mm	72mm	72mm
Bottom Bracket Height	265mm	265mm	265mm	266mm	266mm	266mm	267mm	267mm	267mm
Chainstay Length	410mm	410mm	410mm	410mm	410mm	410mm	410mm	410mm	410mm
Chainstay Length Horizontal	403.3mm	403.3mm	403.3mm	403.5mm	403.5mm	403.5mm	403.6mm	403.6mm	403.6mm
Front-Center	570mm	571mm	572mm	578mm	588mm	593mm	608mm	617mm	636mm
Front-Center Horizontal	565.7mm	565.7mm	566.7mm	573.6mm	583.6mm	588.6mm	603.4mm	612.4mm	632.4mm
Wheelbase	969mm	969mm	970mm	977mm	987mm	992mm	1007mm	1016mm	1036mm
Fork Offset/Rake	50mm	50mm	50mm	43mm	43mm	43mm	43mm	43mm	43mm
Fork Length (On-Axis)	371mm	371mm	371mm	371mm	371mm	371mm	371mm	371mm	371mm
Trail	60.7mm mid/neutral	57.6mm mid/neutral	54.5mm mid/neutral	58.7mm mid/neutral	58.7mm mid/neutral	55.6mm mid/neutral	55.6mm mid/neutral	52.5mm mid/neutral	52.5mm mid/neutral
Mechanical Trail	57.6mm	54.8mm	51.9mm	56.1mm	56.1mm	53.3mm	53.3mm	50.4mm	50.4mm
Wheel Flop	18.3mm	16.9mm	15.6mm	16.4mm	16.4mm	15.1mm	15.1mm	13.9mm	13.9mm
Standover Height	675mm	700mm	725mm	750mm	775mm	800mm	825mm	850mm	875mm
Tire to Pedal Spindle	71mm 160 mm cranks	72mm 160 mm cranks	73mm 160 mm cranks	74mm 165 mm cranks	84mm 165 mm cranks	89mm 165 mm cranks	99mm 170 mm cranks	108mm 170 mm cranks	127mm 170 mm cranks
Pedal Spindle to Ground Clearance	105mm 160 mm cranks	105mm 160 mm cranks	105mm 160 mm cranks	101mm 165 mm cranks	101mm 165 mm cranks	101mm 165 mm cranks	97mm 170 mm cranks	97mm 170 mm cranks	97mm 170 mm cranks

	46	49	52	54	56	58	60	62	64
Wheel Size	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	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	28mm	28mm	28mm	28mm	28mm	28mm	28mm	28mm	28mm
Tire Outer Diameter	678mm	678mm	678mm	678mm	678mm	678mm	678mm	678mm	678mm
Bike Length with Tires	1647mm	1647mm	1648mm	1655mm	1665mm	1670mm	1685mm	1694mm	1714mm
Crank Length	160mm	160mm	160mm	165mm	165mm	165mm	170mm	170mm	170mm
Handlebar Width	380mm	380mm	380mm	400mm	400mm	400mm	420mm	420mm	420mm
Stem Length	80mm	90mm	100mm	100mm	110mm	110mm	110mm	120mm	120mm

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

Performance Road

Source:blackheartbikeco.com

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2026 Black Heart Bike Co Road AL Base

Geometry

Base Build

Stack and Reach vs. Category Trend