2023 TWITTER Bikes Gravel X Base

	46	49	52	55
Stack	562mm	567mm	581mm	592mm
Reach	374mm	393mm	402mm	413mm
Stack to Reach Ratio	1.5:1	1.44:1	1.45:1	1.43:1
Seat Tube Length, C-T	462mm	492mm	522mm	552mm
Top Tube Length, Effective/Horizontal HT Top	541mm	561mm	574mm	588mm
Top Tube Slope	13.3deg	10.1deg	8.3deg	6.3deg
Head Tube Angle	71deg	71deg	72.3deg	72.5deg
Seat Tube Angle	73.5deg	73.5deg	73.5deg	73.5deg
Head Tube Length	125mm	130mm	140mm	150mm
Bottom Bracket Drop	75mm	75mm	75mm	75mm
Bottom Bracket Height	276mm	276mm	276mm	276mm
Chainstay Length	435mm	435mm	435mm	435mm
Chainstay Length Horizontal	428.5mm	428.5mm	428.5mm	428.5mm
Front-Center	595mm	614mm	615mm	627mm
Front-Center Horizontal	589.5mm	609.5mm	610.5mm	622.5mm
Wheelbase	1018mm	1038mm	1039mm	1051mm
Fork Offset/Rake	45mm	45mm	45mm	45mm
Fork Length (Axle-To-Crown)	408.7mm	408.7mm	408.7mm	408.7mm
Trail	73.3mm high	73.3mm high	64.8mm mid/neutral	63.5mm mid/neutral
Mechanical Trail	69.3mm	69.3mm	61.7mm	60.6mm
Wheel Flop	22.6mm	22.6mm	18.8mm	18.2mm
Tire to Pedal Spindle	74mm 170 mm cranks	93mm 170 mm cranks	94mm 170 mm cranks	106mm 170 mm cranks
Pedal Spindle to Ground Clearance	106mm 170 mm cranks	106mm 170 mm cranks	106mm 170 mm cranks	106mm 170 mm cranks

Published Sizing Recommendations

Height

160 cm

170 cm

165 cm

175 cm

185 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.

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