2026 Bike Ahead Composites The Frame Base

	S	M	L	XL
Stack	607mm	607mm	620mm	635mm
Reach	403mm	430mm	455mm	480mm
Stack to Reach Ratio	1.51:1	1.41:1	1.36:1	1.32:1
Seat Tube Length, C-T	400mm	430mm	470mm	520mm
Top Tube Length, Effective/Horizontal HT Top	405mm	430mm	455mm	480mm
Top Tube Slope	23.4deg	19.5deg	16.1deg	12.2deg
Head Tube Angle	68.5deg	68.5deg	68.5deg	68.5deg
Seat Tube Angle	74deg	74deg	74deg	74deg
Head Tube Length	95mm	95mm	110mm	125mm
Bottom Bracket Drop	63mm	63mm	63mm	63mm
Bottom Bracket Height	309mm	309mm	309mm	309mm
Chainstay Length	430mm	430mm	430mm	430mm
Chainstay Length Horizontal	425.4mm	425.4mm	425.4mm	425.4mm
Front-Center	667.6mm	692.5mm	722.4mm	753.3mm
Front-Center Horizontal	664.6mm	689.6mm	719.6mm	750.6mm
Wheelbase	1090mm	1115mm	1145mm	1176mm
Fork Offset/Rake	42mm	42mm	42mm	42mm
Fork Length (Axle-To-Crown)	506mm	506mm	506mm	506mm
Trail	101.4mm very high	101.4mm very high	101.4mm very high	101.4mm very high
Mechanical Trail	94.3mm	94.3mm	94.3mm	94.3mm
Wheel Flop	34.6mm	34.6mm	34.6mm	34.6mm
Tire to Pedal Spindle	125.7mm 170 mm cranks	150.6mm 170 mm cranks	180.4mm 170 mm cranks	211.3mm 170 mm cranks
Pedal Spindle to Ground Clearance	139mm 170 mm cranks	139mm 170 mm cranks	139mm 170 mm cranks	139mm 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:https://bike-ahead-composites.de/products/hardtail/frames/the-frame.html

Geometry