2021 v.3 Disc Soma Fabrications Grand Randonneur Base

Category
Low-trail
Design
Drop Bar, Rigid, non-suspension corrected
Frame
Steel
Fork
Steel
Features
Disc brake
Somewhat aggressive stack and reachvs category
Somewhat aggressive stack and reachvs category
Somewhat aggressive stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Somewhat upright stack and reachvs category

Geometry

46
49
52
55
58
61
65
Stack
523mm
538mm
552mm
571mm
592mm
612mm
650mm
Reach
377mm
380mm
387mm
391mm
395mm
399mm
406mm
Stack to Reach Ratio
1.39:1
1.42:1
1.43:1
1.46:1
1.5:1
1.53:1
1.6:1
Seat Tube Length, C-T
460mm
490mm
520mm
550mm
580mm
610mm
650mm
Top Tube Length, Effective/Horizontal Center
518mm
530mm
545mm
560mm
577mm
591mm
610mm
Top Tube Slope
9.1deg
7.3deg
5.6deg
4.6deg
3.8deg
3deg
2.9deg
Head Tube Angle
72.5deg
72.5deg
72.5deg
72.5deg
73deg
73deg
73deg
Seat Tube Angle
74.5deg
74.5deg
74deg
73.5deg
73deg
72.5deg
72.5deg
Head Tube Length
115mm
130mm
145mm
165mm
185mm
205mm
245mm
Bottom Bracket Drop
65mm
65mm
65mm
65mm
65mm
65mm
65mm
Bottom Bracket Height
269mm
269mm
269mm
269mm
269mm
269mm
269mm
Chainstay Length
430mm
430mm
430mm
430mm
430mm
430mm
430mm
Chainstay Length Horizontal
425.1mm
425.1mm
425.1mm
425.1mm
425.1mm
425.1mm
425.1mm
Front-Center
593mm
601mm
612mm
622mm
628mm
637mm
656mm
Front-Center Horizontal
588.9mm
597.9mm
608.9mm
617.9mm
624.9mm
633.9mm
652.9mm
Wheelbase
1014mm
1023mm
1034mm
1043mm
1050mm
1059mm
1078mm
Fork Offset/Rake
65mm
65mm
65mm
65mm
65mm
65mm
65mm
Trail
37.2mm
low
37.2mm
low
37.2mm
low
37.2mm
low
34.1mm
low
34.1mm
low
34.1mm
low
Mechanical Trail
35.4mm
35.4mm
35.4mm
35.4mm
32.7mm
32.7mm
32.7mm
Wheel Flop
10.7mm
10.7mm
10.7mm
10.7mm
9.6mm
9.6mm
9.6mm
Standover Height
734.1mm
751.8mm
767.1mm
789.9mm
817.9mm
844.6mm
881.4mm
Tire to Pedal Spindle
89mm
170 mm cranks
97mm
170 mm cranks
108mm
170 mm cranks
118mm
170 mm cranks
124mm
170 mm cranks
133mm
170 mm cranks
152mm
170 mm cranks
Pedal Spindle to Ground Clearance
99mm
170 mm cranks
99mm
170 mm cranks
99mm
170 mm cranks
99mm
170 mm cranks
99mm
170 mm cranks
99mm
170 mm cranks
99mm
170 mm cranks

Base Build

46
49
52
55
58
61
65
Wheel Size
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
650B/27.5 in
584 mm BSD
Tire Width
42mm
42mm
42mm
42mm
42mm
42mm
42mm
Tire Width Max
47mm
47mm
47mm
47mm
47mm
47mm
47mm
Tire Outer Diameter
668mm
668mm
668mm
668mm
668mm
668mm
668mm
Bike Length with Tires
1682mm
1691mm
1702mm
1711mm
1718mm
1727mm
1746mm

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
Low-trail
Source:https://www.somafab.com/archives/product/grand-randonneur-frame-set