2024 TWITTER Bikes Gravel v1 Base

	450	480	510	540
Stack	547.6mm	568.5mm	589.5mm	610.5mm
Reach	377.7mm	381.9mm	388.4mm	407.3mm
Stack to Reach Ratio	1.45:1	1.49:1	1.52:1	1.5:1
Seat Tube Length, C-T	450mm	480mm	510mm	540mm
Top Tube Length, Effective/Horizontal Center	539.9mm	550.3mm	568.6mm	593.9mm
Top Tube Slope	12.9deg	11.8deg	10.7deg	9.5deg
Head Tube Angle	72deg	72.5deg	73deg	73.5deg
Seat Tube Angle	73.5deg	73.5deg	73deg	73deg
Head Tube Length	130mm	150mm	170mm	190mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm
Bottom Bracket Height	281mm	281mm	281mm	281mm
Chainstay Length	420mm	420mm	420mm	420mm
Chainstay Length Horizontal	414.1mm	414.1mm	414.1mm	414.1mm
Front-Center	594.9mm	600.8mm	608.8mm	629.7mm
Front-Center Horizontal	590.9mm	596.9mm	604.9mm	624.9mm
Wheelbase	1005mm	1011mm	1019mm	1039mm
Fork Offset/Rake	55mm	55mm	55mm	55mm
Fork Length, Unknown	390mm	390mm	390mm	390mm
Trail	56.2mm mid/neutral	53mm mid/neutral	49.8mm mid/neutral	46.6mm mid/neutral
Mechanical Trail	53.5mm	50.6mm	47.6mm	44.7mm
Wheel Flop	16.5mm	15.2mm	13.9mm	12.7mm
Tire to Pedal Spindle	73.9mm 170 mm cranks	79.8mm 170 mm cranks	87.8mm 170 mm cranks	108.7mm 170 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks

Published Sizing Recommendations

Height

150 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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