	480	500	520	540	560	580
Stack	510mm	529mm	542mm	554mm	569mm	583mm
Reach	378mm	383mm	385mm	386mm	391mm	396mm
Stack to Reach Ratio	1.35:1	1.38:1	1.41:1	1.44:1	1.46:1	1.47:1
Top Tube Length, Effective/Horizontal HT Top	510mm	525mm	535mm	545mm	560mm	575mm
Head Tube Angle	70.5deg	70.5deg	71deg	71.5deg	72deg	72.5deg
Seat Tube Angle	75.5deg	75deg	74.5deg	74deg	73.5deg	73deg
Head Tube Length	100mm	115mm	125mm	135mm	145mm	160mm
Bottom Bracket Drop	53mm	58mm	60mm	60mm	62mm	62mm
Bottom Bracket Height	291mm	286mm	284mm	284mm	282mm	282mm
Chainstay Length	425mm	425mm	425mm	425mm	425mm	425mm
Chainstay Length Horizontal	421.7mm	421mm	420.7mm	420.7mm	420.5mm	420.5mm
Front-Center	590mm	600mm	601mm	602mm	606mm	611mm
Front-Center Horizontal	587.3mm	597mm	598.3mm	599.3mm	603.6mm	607.6mm
Wheelbase	1009mm	1018mm	1019mm	1020mm	1024mm	1028mm
Fork Offset/Rake	44.8mm	44.5mm	44.7mm	45.5mm	45.5mm	45.1mm
Fork Length, Unknown	400mm	400mm	400mm	400mm	400mm	400mm
Trail	74.3mm high	74.6mm high	71.2mm high	67.1mm high	64mm mid/neutral	61.2mm mid/neutral
Mechanical Trail	70.1mm	70.4mm	67.3mm	63.7mm	60.8mm	58.4mm
Wheel Flop	23.4mm	23.5mm	21.9mm	20.2mm	18.8mm	17.6mm
Tire to Pedal Spindle	76mm 170 mm cranks	86mm 170 mm cranks	87mm 170 mm cranks	88mm 170 mm cranks	92mm 170 mm cranks	97mm 170 mm cranks
Pedal Spindle to Ground Clearance	121mm 170 mm cranks	116mm 170 mm cranks	114mm 170 mm cranks	114mm 170 mm cranks	112mm 170 mm cranks	112mm 170 mm cranks

	480	500	520	540	560	580
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
Tire Width	33mm	33mm	33mm	33mm	33mm	33mm
Tire Outer Diameter	688mm	688mm	688mm	688mm	688mm	688mm
Bike Length with Tires	1697mm	1706mm	1707mm	1708mm	1712mm	1716mm

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

2025 Bianchi Zolder Base

Geometry