2021 J.Laverack Bicycles J.ACK Frameset

Design
Drop Bar, Rigid, non-suspension corrected
Frame
Titanium
Fork
Carbon/Composite
Features
Disc brake
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category

Geometry

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

Frameset Build

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
to
158 cm
156 cm
to
164 cm
162 cm
to
170 cm
168 cm
to
178 cm
174 cm
to
184 cm
180 cm
to
188 cm
186 cm
to
194 cm
192 cm
to
200 cm

Stack and Reach vs. Category Trend

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/