2025 Crust Bikes Bombora Base

	XS	Small	Medium	Large	XL	XXL
Stack	540mm	553mm	576mm	599mm	628mm	660mm
Reach	365mm	378mm	382mm	395mm	406mm	416mm
Stack to Reach Ratio	1.48:1	1.46:1	1.51:1	1.52:1	1.55:1	1.59:1
Seat Tube Length, C-T	456mm	502mm	543mm	574mm	629mm	670mm
Seat Tube Length, Unknown	408mm	455mm	494mm	529mm	581mm	622mm
Top Tube Length, Effective/Horizontal Center	520.1mm	545.9mm	566.1mm	584.3mm	604mm	622.8mm
Top Tube Length, Effective/Horizontal Unknown	520mm	540mm	560mm	580mm	600mm	620mm
Top Tube Length, Actual C-C	502mm	525mm	546mm	569mm	594mm	619mm
Top Tube Slope	18.7deg	14.1deg	9.5deg	6.1deg	3.5deg	1.2deg
Head Tube Angle	69.5deg	70deg	71deg	71deg	71deg	71deg
Seat Tube Angle	74.5deg	74deg	73deg	73deg	73deg	73deg
Head Tube Length	121mm	132mm	153mm	177mm	208mm	241mm
Bottom Bracket Drop	64mm	64mm	64mm	64mm	64mm	64mm
Bottom Bracket Height	286.4mm	230.3mm	230.3mm	230.3mm	230.3mm	230.3mm
Chainstay Length	425mm	425mm	425mm	425mm	425mm	—
Chainstay Length Horizontal	420.2mm	420.2mm	420.2mm	420.2mm	420.2mm	—
Front-Center	591.3mm	603.3mm	606.2mm	626.1mm	647mm	675mm
Front-Center Horizontal	587.9mm	599.9mm	602.9mm	622.9mm	643.9mm	672mm
Wheelbase	1008mm	1020mm	1023mm	1043mm	1064mm	1085mm
Fork Offset/Rake	48mm	48mm	48mm	48mm	48mm	48mm
Trail	79.8mm high	56mm mid/neutral	50.6mm mid/neutral	50.6mm mid/neutral	50.6mm mid/neutral	50.6mm mid/neutral
Mechanical Trail	74.7mm	52.7mm	47.8mm	47.8mm	47.8mm	47.8mm
Wheel Flop	26.2mm	18mm	15.6mm	15.6mm	15.6mm	15.6mm
Standover Height	747mm	775mm	804mm	832mm	872mm	907mm
Tire to Pedal Spindle	70.9mm 170 mm cranks	139mm 170 mm cranks	141.9mm 170 mm cranks	161.8mm 170 mm cranks	182.7mm 170 mm cranks	210.7mm 170 mm cranks
Pedal Spindle to Ground Clearance	116.4mm 170 mm cranks	60.3mm 170 mm cranks	60.3mm 170 mm cranks	60.3mm 170 mm cranks	60.3mm 170 mm cranks	60.3mm 170 mm cranks

	XS	Small	Medium	Large	XL	XXL
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
Tire Width	2.3in	2.3mm	2.3mm	2.3mm	2.3mm	2.3mm
Tire Width Max	2.3mm	2.3mm	2.3mm	2.3mm	2.3mm	2.3mm
Tire Outer Diameter	700.8mm	588.6mm	588.6mm	588.6mm	588.6mm	588.6mm
Bike Length with Tires	1708.8mm	1608.6mm	1611.6mm	1631.6mm	1652.6mm	1673.6mm

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

All-road/Gravel

Source:https://crustbikes.com/collections/frames/products/celos-bombora

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2025 Crust Bikes Bombora Base

Geometry

Base Build

Stack and Reach vs. Category Trend