2012 Soma Fabrications San Marcos Base

	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

	47	51	54	57	59	63
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	700C/29 in 622 mm BSD	700C/29 in 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

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

Geometry