2025 TWITTER Bikes Gravel G3 Base

	41	44	47	50	53
Stack	537mm	541.7mm	562.4mm	578.5mm	597.4mm
Reach	360mm	368mm	375mm	382mm	388mm
Stack to Reach Ratio	1.49:1	1.47:1	1.5:1	1.51:1	1.54:1
Seat Tube Length, C-T	410mm	440mm	470mm	500mm	530mm
Top Tube Length, Effective/Horizontal Center	524.2mm	533.6mm	546.9mm	564.4mm	576.3mm
Top Tube Slope	16.8deg	13.7deg	12.4deg	10.8deg	9.5deg
Head Tube Angle	70deg	70deg	70.5deg	71deg	71deg
Seat Tube Angle	73deg	73deg	73deg	72.5deg	72.5deg
Head Tube Length	110mm	115mm	135mm	150mm	170mm
Bottom Bracket Drop	75mm	75mm	75mm	75mm	75mm
Bottom Bracket Height	274mm	274mm	274mm	274mm	274mm
Chainstay Length	425mm	425mm	425mm	425mm	425mm
Chainstay Length Horizontal	418.3mm	418.3mm	418.3mm	418.3mm	418.3mm
Front-Center	575.1mm	590.6mm	600.1mm	607.6mm	620mm
Front-Center Horizontal	570.2mm	585.8mm	595.4mm	603mm	615.5mm
Wheelbase	988.5mm	1004.1mm	1013.7mm	1021.3mm	1033.8mm
Fork Offset/Rake	39.5mm	45mm	45mm	45mm	45mm
Fork Length, Unknown	397mm	397mm	397mm	397mm	397mm
Trail	85mm very high	79.1mm high	75.8mm high	72.6mm high	72.6mm high
Mechanical Trail	79.9mm	74.4mm	71.5mm	68.6mm	68.6mm
Wheel Flop	27.3mm	25.4mm	23.9mm	22.3mm	22.3mm
Tire to Pedal Spindle	56.1mm 170 mm cranks	71.6mm 170 mm cranks	81.1mm 170 mm cranks	88.6mm 170 mm cranks	101mm 170 mm cranks
Pedal Spindle to Ground Clearance	104mm 170 mm cranks	104mm 170 mm cranks	104mm 170 mm cranks	104mm 170 mm cranks	104mm 170 mm cranks

Published Sizing Recommendations

Height

150 cm

155 cm

165 cm

172 cm

178 cm

185 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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