2025 Soma Fabrications Rush Base

	48	53	55	57	60
Stack	508mm	520mm	540mm	556mm	598mm
Reach	397mm	398mm	408mm	419mm	427mm
Stack to Reach Ratio	1.28:1	1.31:1	1.32:1	1.33:1	1.4:1
Seat Tube Length, C-T	480mm	530mm	550mm	570mm	600mm
Top Tube Length, Effective/Horizontal Center	529mm	535mm	550mm	565mm	588mm
Top Tube Slope	4.8deg	0.8deg	0.8deg	0.5deg	1.9deg
Head Tube Angle	73.4deg	74deg	74.3deg	74.6deg	75deg
Seat Tube Angle	75.5deg	75.3deg	75.3deg	75.3deg	74.8deg
Head Tube Length	100mm	110mm	130mm	145mm	180mm
Bottom Bracket Drop	58mm	58mm	58mm	58mm	58mm
Bottom Bracket Height	281mm	281mm	281mm	281mm	281mm
Chainstay Length	393mm	393mm	393mm	393mm	393mm
Chainstay Length Horizontal	388.7mm	388.7mm	388.7mm	388.7mm	388.7mm
Front-Center	572mm	572mm	586mm	598mm	611mm
Front-Center Horizontal	570.3mm	570.3mm	583.3mm	595.3mm	611.3mm
Wheelbase	959mm	959mm	972mm	984mm	1000mm
Fork Offset/Rake	38mm	38mm	38mm	38mm	38mm
Trail	61.4mm mid/neutral	57.7mm mid/neutral	55.8mm mid/neutral	54mm mid/neutral	51.5mm mid/neutral
Mechanical Trail	58.9mm	55.4mm	53.7mm	52mm	49.7mm
Wheel Flop	16.8mm	15.3mm	14.5mm	13.8mm	12.9mm
Standover Height	29.6mm	30.7mm	31.6mm	32.3mm	32.9mm
Tire to Pedal Spindle	63mm 170 mm cranks	63mm 170 mm cranks	77mm 170 mm cranks	89mm 170 mm cranks	102mm 170 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks

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:https://www.somafab.com/archives/product/rush-fixed-gear-ss

Geometry