2024 BOMA Evolution IV Base

	S-470	M-500	L-530
Stack	517mm	540mm	557mm
Reach	374mm	380mm	388mm
Stack to Reach Ratio	1.38:1	1.42:1	1.44:1
Seat Tube Length, C-T	470mm	500mm	530mm
Top Tube Length, Effective/Horizontal Center	515mm	532mm	550mm
Top Tube Slope	7.3deg	6.5deg	5.1deg
Head Tube Angle	72deg	72.3deg	72.8deg
Seat Tube Angle	74.8deg	74.3deg	73.8deg
Head Tube Length	107mm	130mm	148mm
Bottom Bracket Drop	70mm	70mm	68mm
Bottom Bracket Height	271mm	271mm	273mm
Chainstay Length	415mm	415mm	415mm
Chainstay Length Horizontal	409.1mm	409.1mm	409.4mm
Front-Center	571mm	582mm	590mm
Front-Center Horizontal	567mm	577mm	586.6mm
Wheelbase	976mm	986mm	996mm
Fork Offset/Rake	45mm	45mm	45mm
Trail	63.5mm mid/neutral	61.6mm mid/neutral	58.5mm mid/neutral
Mechanical Trail	60.4mm	58.7mm	55.8mm
Wheel Flop	18.7mm	17.8mm	16.5mm
Tire to Pedal Spindle	60mm 170 mm cranks	71mm 170 mm cranks	79mm 170 mm cranks
Pedal Spindle to Ground Clearance	101mm 170 mm cranks	101mm 170 mm cranks	103mm 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:http://www.boma.jp/products/frame_set/evolution4/

Geometry