2025 Acme Bar Base

	Small	Medium	Large	X-Large
Stack	547.9mm	573.4mm	597.1mm	618.7mm
Reach	382.9mm	390.2mm	397.4mm	408.9mm
Stack to Reach Ratio	1.43:1	1.47:1	1.5:1	1.51:1
Seat Tube Length, C-T	510mm	535mm	560mm	580mm
Top Tube Length, Actual C-C	540mm	560mm	580mm	600mm
Top Tube Slope	6.3deg	6.4deg	6.3deg	6.5deg
Head Tube Angle	70deg	70.5deg	71deg	71deg
Seat Tube Angle	74deg	73.5deg	73deg	72deg
Head Tube Length	115mm	135mm	160mm	185mm
Bottom Bracket Drop	78mm	76mm	76mm	72mm
Bottom Bracket Height	280mm	282mm	282mm	286mm
Chainstay Length	435mm	435mm	435mm	435mm
Chainstay Length Horizontal	428mm	428.3mm	428.3mm	429mm
Front-Center	614.3mm	621.2mm	636.6mm	655mm
Front-Center Horizontal	609.4mm	616.5mm	632.1mm	651mm
Wheelbase	1037.3mm	1044.8mm	1060.4mm	1080mm
Fork Offset/Rake	52mm	52mm	52mm	52mm
Fork Length (On-Axis)	395mm	395mm	395mm	395mm
Trail	75mm high	71.6mm high	68.3mm high	68.3mm high
Mechanical Trail	70.4mm	67.5mm	64.6mm	64.6mm
Wheel Flop	24.1mm	22.5mm	21mm	21mm
Tire to Pedal Spindle	86.3mm 170 mm cranks	90.7mm 172.5 mm cranks	106.1mm 172.5 mm cranks	122mm 175 mm cranks
Pedal Spindle to Ground Clearance	110mm 170 mm cranks	109.5mm 172.5 mm cranks	109.5mm 172.5 mm cranks	111mm 175 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:https://acmebikes.cc/products/bar-frameset

Geometry