2017 Ridley Bikes Helium X Base

	XXS	XS	S	M	L	XL
Stack	507mm	526mm	542mm	573mm	599mm	625mm
Reach	379mm	374mm	384mm	390mm	396mm	403mm
Stack to Reach Ratio	1.34:1	1.41:1	1.41:1	1.47:1	1.51:1	1.55:1
Seat Tube Length, C-T	450mm	480mm	510mm	540mm	570mm	600mm
Seat Tube Length, C-C	410mm	440mm	470mm	500mm	530mm	560mm
Top Tube Length, Effective/Horizontal Center	515mm	525mm	545mm	565mm	585mm	600mm
Top Tube Length, Actual C-C	501mm	509mm	529mm	548mm	567mm	582mm
Top Tube Slope	8.2deg	8.5deg	7.6deg	7.4deg	7.2deg	7deg
Head Tube Angle	71.8deg	72deg	73deg	73.5deg	73.5deg	74deg
Seat Tube Angle	75deg	74deg	73.5deg	73deg	72.5deg	72.5deg
Head Tube Length	107mm	127mm	142mm	172mm	202mm	227mm
Bottom Bracket Drop	68mm	68mm	66mm	66mm	63mm	63mm
Bottom Bracket Height	268mm	268mm	270mm	270mm	273mm	273mm
Chainstay Length	405mm	405mm	405mm	405mm	408mm	408mm
Chainstay Length Horizontal	399.3mm	399.3mm	399.6mm	399.6mm	403.1mm	403.1mm
Front-Center	574.8mm	573.8mm	581.2mm	590.1mm	605.2mm	614.1mm
Front-Center Horizontal	570.8mm	569.8mm	577.4mm	586.4mm	601.9mm	610.9mm
Wheelbase	970mm	969mm	977mm	986mm	1005mm	1014mm
Fork Offset/Rake	45mm	44.6mm	45.8mm	44.3mm	45.2mm	44.9mm
Trail	63.1mm mid/neutral	62.2mm mid/neutral	54.8mm mid/neutral	53.3mm mid/neutral	52.4mm mid/neutral	49.6mm mid/neutral
Mechanical Trail	59.9mm	59.2mm	52.4mm	51.1mm	50.3mm	47.7mm
Wheel Flop	18.7mm	18.3mm	15.3mm	14.5mm	14.3mm	13.1mm
Tire to Pedal Spindle	68.8mm 170 mm cranks	67.8mm 170 mm cranks	75.2mm 170 mm cranks	84.1mm 170 mm cranks	99.2mm 170 mm cranks	108.1mm 170 mm cranks
Pedal Spindle to Ground Clearance	98mm 170 mm cranks	98mm 170 mm cranks	100mm 170 mm cranks	100mm 170 mm cranks	103mm 170 mm cranks	103mm 170 mm cranks

	XXS	XS	S	M	L	XL
Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	25mm	25mm	25mm	25mm	25mm	25mm
Tire Outer Diameter	672mm	672mm	672mm	672mm	672mm	672mm
Bike Length with Tires	1642mm	1641mm	1649mm	1658mm	1677mm	1686mm

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.

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Source:ridley

Geometry