2025 CHIRU Allure Base

	XS	S	M	L
Stack	536mm	547mm	563mm	590mm
Reach	374mm	392mm	406mm	419mm
Stack to Reach Ratio	1.43:1	1.4:1	1.39:1	1.41:1
Seat Tube Length, Unknown	430mm	450mm	475mm	500mm
Top Tube Length, Effective/Horizontal Center	525mm	545mm	565mm	585mm
Top Tube Slope	14deg	12.5deg	11.2deg	11.1deg
Head Tube Angle	70.2deg	70.5deg	71deg	71.8deg
Seat Tube Angle	73.8deg	73.8deg	73.8deg	73.8deg
Head Tube Length	135mm	145mm	160mm	185mm
Bottom Bracket Drop	73mm	73mm	73mm	73mm
Bottom Bracket Height	268mm	268mm	268mm	268mm
Chainstay Length	420mm	420mm	420mm	420mm
Chainstay Length Horizontal	413.6mm	413.6mm	413.6mm	413.6mm
Front-Center	603.8mm	615.7mm	637.6mm	650.5mm
Front-Center Horizontal	599.4mm	611.4mm	633.4mm	646.4mm
Wheelbase	1013mm	1025mm	1047mm	1060mm
Fork Offset/Rake	47mm	47mm	47mm	47mm
Fork Length (Axle-To-Crown)	380mm	380mm	380mm	380mm
Trail	72.8mm high	70.9mm high	67.7mm high	62.6mm mid/neutral
Mechanical Trail	68.5mm	66.8mm	64mm	59.5mm
Wheel Flop	23.2mm	22.3mm	20.8mm	18.6mm
Tire to Pedal Spindle	92.8mm 170 mm cranks	104.7mm 170 mm cranks	126.6mm 170 mm cranks	139.5mm 170 mm cranks
Pedal Spindle to Ground Clearance	98mm 170 mm cranks	98mm 170 mm cranks	98mm 170 mm cranks	98mm 170 mm cranks

Published Sizing Recommendations

Height

156 cm

164 cm

165 cm

173 cm

174 cm

183 cm

184 cm

195 cm

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.chirubikes.com/en/kit-cadre/allure/