2025 Ridley Bikes Ignite GTX Alpine gravel Base, 29x2.3, 100mm fork adjusted

	S	M	L	XL
Stack	609mm	614mm	623mm	642mm
Reach	400mm	418mm	440mm	460mm
Stack to Reach Ratio	1.52:1	1.47:1	1.42:1	1.4:1
Seat Tube Length, C-T	380mm	435mm	485mm	535mm
Top Tube Length, Effective/Horizontal HT Top	580mm	600mm	625mm	650mm
Top Tube Slope	25.7deg	20deg	15.3deg	11.9deg
Head Tube Angle	70deg	70deg	70deg	70deg
Seat Tube Angle	73.5deg	73.5deg	73.5deg	73.5deg
Head Tube Length	95mm	100mm	110mm	130mm
Bottom Bracket Drop	58mm	58mm	58mm	58mm
Bottom Bracket Height	308mm	308mm	308mm	308mm
Chainstay Length	430mm	430mm	430mm	430mm
Chainstay Length Horizontal	426.1mm	426.1mm	426.1mm	426.1mm
Front-Center	656.5mm	676.4mm	702.3mm	728.2mm
Front-Center Horizontal	653.9mm	673.9mm	699.9mm	725.9mm
Wheelbase	1080mm	1100mm	1126mm	1152mm
Fork Offset/Rake	50.2mm	50.3mm	51mm	50.2mm
Trail	79.8mm high	79.7mm high	78.9mm high	79.8mm high
Mechanical Trail	75mm	74.9mm	74.2mm	75mm
Wheel Flop	25.7mm	25.6mm	25.4mm	25.7mm
Tire to Pedal Spindle	120.5mm 170 mm cranks	140.4mm 170 mm cranks	166.3mm 170 mm cranks	192.2mm 170 mm cranks
Pedal Spindle to Ground Clearance	138mm 170 mm cranks	138mm 170 mm cranks	138mm 170 mm cranks	138mm 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.ridley-bikes.com/en_US/bikes/SBIISXRID310

Geometry