2012 Soma Fabrications San Marcos Base

Design
Drop Bar, Rigid, non-suspension corrected
Frame
Steel
Fork
Steel
Features
Rim brake
Very upright stack and reachvs category
Very upright stack and reachvs category
Somewhat upright stack and reachvs category
Very upright stack and reachvs category
Very upright stack and reachvs category
Very upright stack and reachvs category

Geometry

47
51
54
57
59
63
Stack
544mm
578mm
603mm
628mm
644mm
679mm
Reach
352mm
356mm
376mm
375mm
379mm
382mm
Stack to Reach Ratio
1.55:1
1.62:1
1.6:1
1.67:1
1.7:1
1.78:1
Seat Tube Length, C-T
470mm
510mm
540mm
570mm
590mm
630mm
Top Tube Length, Effective/Horizontal Center
535mm
550mm
575mm
582mm
590mm
605mm
Top Tube Slope
11.1deg
10.3deg
9.4deg
8.9deg
8.4deg
7.9deg
Head Tube Angle
71deg
71deg
71deg
71deg
72.5deg
72.5deg
Seat Tube Angle
71.5deg
71.5deg
71.8deg
71.8deg
72deg
72deg
Head Tube Length
145mm
184mm
209mm
235mm
219mm
257mm
Bottom Bracket Drop
65mm
65mm
65mm
65mm
77mm
77mm
Bottom Bracket Height
255mm
255mm
255mm
255mm
262mm
262mm
Chainstay Length
445mm
445mm
445mm
445mm
440mm
440mm
Chainstay Length Horizontal
440.2mm
440.2mm
440.2mm
440.2mm
433.2mm
433.2mm
Front-Center
575.5mm
591.4mm
619.2mm
627.2mm
609.7mm
623.6mm
Front-Center Horizontal
571.8mm
587.8mm
615.8mm
623.8mm
604.8mm
618.8mm
Wheelbase
1012mm
1028mm
1056mm
1064mm
1038mm
1052mm
Fork Offset/Rake
52mm
52mm
52mm
52mm
45mm
45mm
Fork Length (Axle-To-Crown)
369mm
369mm
369mm
369mm
379mm
379mm
Trail
55.2mm
mid/​neutral
55.2mm
mid/​neutral
55.2mm
mid/​neutral
55.2mm
mid/​neutral
59.7mm
mid/​neutral
59.7mm
mid/​neutral
Mechanical Trail
52.2mm
52.2mm
52.2mm
52.2mm
56.9mm
56.9mm
Wheel Flop
17mm
17mm
17mm
17mm
17.1mm
17.1mm
Standover Height
731.5mm
769.6mm
815.3mm
843.3mm
845.8mm
878.8mm
Tire to Pedal Spindle
85.5mm
170 mm cranks
101.4mm
170 mm cranks
129.2mm
170 mm cranks
137.2mm
170 mm cranks
100.7mm
170 mm cranks
114.6mm
170 mm cranks
Pedal Spindle to Ground Clearance
85mm
170 mm cranks
85mm
170 mm cranks
85mm
170 mm cranks
85mm
170 mm cranks
92mm
170 mm cranks
92mm
170 mm cranks

Base Build

47
51
54
57
59
63
Wheel Size
650B/27.5
584 mm BSD
650B/27.5
584 mm BSD
650B/27.5
584 mm BSD
650B/27.5
584 mm BSD
700C/29"
622 mm BSD
700C/29"
622 mm BSD
Tire Width
28mm
28mm
28mm
28mm
28mm
28mm
Tire Outer Diameter
640mm
640mm
640mm
640mm
678mm
678mm
Bike Length with Tires
1652mm
1668mm
1696mm
1704mm
1716mm
1730mm

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
Sport Touring
Source:http://www.somafab.com/archives/product/san-marcos-frame-set