2021 J.Laverack Bicycles J.ACK Frameset

	48	50	52	54	56	58	60	62
Stack	521.2mm	532.4mm	553.2mm	572.2mm	583.5mm	597.8mm	612.1mm	623.5mm
Reach	358mm	364mm	370mm	376mm	382.1mm	388mm	394.3mm	400mm
Stack to Reach Ratio	1.46:1	1.46:1	1.5:1	1.52:1	1.53:1	1.54:1	1.55:1	1.56:1
Seat Tube Length, C-T	480mm	500mm	520mm	540mm	560mm	580mm	600mm	620mm
Top Tube Length, Effective/Horizontal Unknown	517.3mm	526.8mm	539.1mm	550.9mm	560.5mm	570.8mm	581.5mm	590.6mm
Top Tube Length, Actual C-C	501.4mm	512mm	523.5mm	550.9mm	546mm	557mm	569.2mm	579.6mm
Top Tube Slope	7.1deg	6.1deg	6.1deg	6deg	5deg	4.4deg	3.9deg	3deg
Head Tube Angle	70.5deg	71deg	71.5deg	71.5deg	71.5deg	72deg	72deg	72.5deg
Seat Tube Angle	73deg	73deg	73deg	73deg	73deg	73deg	73deg	73deg
Head Tube Length	100mm	110mm	130mm	150mm	160mm	175mm	190mm	200mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm	70mm	70mm	70mm	70mm
Bottom Bracket Height	273mm	273mm	273mm	273mm	273mm	273mm	273mm	273mm
Chainstay Length	420mm	420mm	420mm	420mm	420mm	420mm	420mm	420mm
Chainstay Length Horizontal	414.1mm	414.1mm	414.1mm	414.1mm	414.1mm	414.1mm	414.1mm	414.1mm
Front-Center	573.7mm	581.6mm	583.3mm	595.6mm	605.4mm	610.8mm	621.7mm	625.6mm
Front-Center Horizontal	569.5mm	577.4mm	579.1mm	591.5mm	601.5mm	606.8mm	617.8mm	621.7mm
Wheelbase	983.6mm	991.5mm	993.2mm	1005.6mm	1015.6mm	1020.9mm	1031.9mm	1035.8mm
Fork Offset/Rake	45mm	45mm	45mm	45mm	45mm	45mm	45mm	45mm
Fork Length (Axle-To-Crown)	395mm	395mm	395mm	395mm	395mm	395mm	395mm	395mm
Trail	73.7mm high	70.5mm high	67.3mm high	67.3mm high	67.3mm high	64.1mm mid/neutral	64.1mm mid/neutral	61mm mid/neutral
Mechanical Trail	69.5mm	66.7mm	63.8mm	63.8mm	63.8mm	61mm	61mm	58.1mm
Wheel Flop	23.2mm	21.7mm	20.3mm	20.3mm	20.3mm	18.9mm	18.9mm	17.5mm
Tire to Pedal Spindle	60.7mm 170 mm cranks	68.6mm 170 mm cranks	70.3mm 170 mm cranks	80.1mm 172.5 mm cranks	89.9mm 172.5 mm cranks	92.8mm 175 mm cranks	103.7mm 175 mm cranks	105.1mm 177.5 mm cranks
Pedal Spindle to Ground Clearance	103mm 170 mm cranks	103mm 170 mm cranks	103mm 170 mm cranks	100.5mm 172.5 mm cranks	100.5mm 172.5 mm cranks	98mm 175 mm cranks	98mm 175 mm cranks	95.5mm 177.5 mm cranks

	48	50	52	54	56	58	60	62
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
Tire Width	32mm	32mm	32mm	32mm	32mm	32mm	32mm	32mm
Tire Width Max	38mm	38mm	38mm	38mm	38mm	38mm	38mm	38mm
Tire Outer Diameter	686mm	686mm	686mm	686mm	686mm	686mm	686mm	686mm
Bike Length with Tires	1669.6mm	1677.5mm	1679.2mm	1691.6mm	1701.6mm	1706.9mm	1717.9mm	1721.8mm
Crank Length	170mm	170mm	170mm	172.5mm	172.5mm	175mm	175mm	177.5mm
Handlebar Width	39cm	40cm	41cm	42cm	42cm	43cm	44cm	44cm
Stem Length	85mm	90mm	95mm	100mm	100mm	110mm	115mm	120mm

Published Sizing Recommendations

Height

152 cm

158 cm

156 cm

164 cm

162 cm

170 cm

168 cm

178 cm

174 cm

184 cm

180 cm

188 cm

186 cm

194 cm

192 cm

200 cm

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

Endurance Road

Source:https://www.jlaverack.co.uk/jack-frameset-build/

Suggest Bike Edit

2021 J.Laverack Bicycles J.ACK Frameset

Geometry

Frameset Build

Published Sizing Recommendations

Stack and Reach vs. Category Trend