2018 Bowman Cycles Layhams Rim Base

	50	52	54	56	58	60
Stack	521mm	532mm	553mm	574mm	593mm	607mm
Reach	350mm	361mm	371mm	384mm	393mm	402mm
Stack to Reach Ratio	1.49:1	1.47:1	1.49:1	1.49:1	1.51:1	1.51:1
Seat Tube Length, C-T	490mm	510mm	530mm	550mm	570mm	585mm
Top Tube Length, Effective/Horizontal Center	505mm	520mm	540mm	560mm	580mm	600mm
Top Tube Slope	6deg	4.9deg	5deg	5deg	5deg	5deg
Head Tube Angle	70.5deg	71deg	71.5deg	72deg	72deg	72deg
Seat Tube Angle	73.5deg	73.5deg	73deg	73deg	72.5deg	72deg
Head Tube Length	95mm	110mm	130mm	150mm	170mm	185mm
Bottom Bracket Drop	80mm	78mm	75mm	75mm	75mm	75mm
Bottom Bracket Height	256mm	258mm	261mm	261mm	261mm	261mm
Chainstay Length	418mm	420mm	420mm	420mm	425mm	425mm
Chainstay Length Horizontal	410.3mm	412.7mm	413.3mm	413.3mm	418.3mm	418.3mm
Front-Center	566.4mm	576.6mm	582.6mm	593.5mm	607.3mm	621.2mm
Front-Center Horizontal	560.7mm	571.3mm	577.8mm	588.8mm	602.7mm	616.7mm
Wheelbase	971mm	984mm	991mm	1002mm	1021mm	1035mm
Fork Offset/Rake	51.4mm	51mm	44.4mm	40.5mm	39.3mm	39.8mm
Fork Length (Axle-To-Crown)	375mm	375mm	375mm	375mm	375mm	375mm
Trail	64.4mm mid/neutral	61.7mm mid/neutral	65.6mm high	66.6mm high	67.8mm high	67.4mm high
Mechanical Trail	60.7mm	58.4mm	62.2mm	63.3mm	64.5mm	64.1mm
Wheel Flop	20.3mm	19mm	19.7mm	19.6mm	19.9mm	19.8mm
Tire to Pedal Spindle	60.4mm 170 mm cranks	70.6mm 170 mm cranks	76.6mm 170 mm cranks	87.5mm 170 mm cranks	101.3mm 170 mm cranks	115.2mm 170 mm cranks
Pedal Spindle to Ground Clearance	86mm 170 mm cranks	88mm 170 mm cranks	91mm 170 mm cranks	91mm 170 mm cranks	91mm 170 mm cranks	91mm 170 mm cranks

	50	52	54	56	58	60
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	25mm	25mm	25mm	25mm	25mm	25mm
Tire Width Max	30mm	30mm	30mm	30mm	30mm	30mm
Tire Outer Diameter	672mm	672mm	672mm	672mm	672mm	672mm
Bike Length with Tires	1643mm	1656mm	1663mm	1674mm	1693mm	1707mm

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:Manufacturer figures

Geometry