2025 BTR Fabrications Belter 26

	XS	S	M	L	XL
Stack	628.9mm	628.9mm	637.6mm	646.3mm	646.3mm
Reach	390mm	410mm	430mm	450mm	470mm
Stack to Reach Ratio	1.61:1	1.53:1	1.48:1	1.44:1	1.38:1
Seat Tube Length, Unknown	350mm	360mm	380mm	400mm	420mm
Top Tube Length, Effective/Horizontal Unknown	558.5mm	578.5mm	600.8mm	623.2mm	643.2mm
Top Tube Slope	31.2deg	29.2deg	27.1deg	25.2deg	22.6deg
Head Tube Angle	61deg	61deg	61deg	61deg	61deg
Seat Tube Angle	75deg	75deg	75deg	75deg	75deg
Head Tube Length	130mm	130mm	140mm	150mm	150mm
Bottom Bracket Drop	48.3mm	48.3mm	48.3mm	48.3mm	48.3mm
Bottom Bracket Height	294.8mm	294.8mm	294.8mm	294.8mm	294.8mm
Chainstay Length Horizontal	405mm	410mm	415mm	415mm	420mm
Front-Center	759.1mm	779.1mm	803.9mm	828.7mm	848.6mm
Front-Center Horizontal	757.6mm	777.6mm	802.4mm	827.3mm	847.3mm
Wheelbase	1162.6mm	1187.6mm	1217.4mm	1242.3mm	1267.3mm
Fork Offset/Rake	40mm	40mm	40mm	40mm	40mm
Fork Length (Axle-To-Crown)	542mm	542mm	542mm	542mm	542mm
Trail	144.4mm very high	144.4mm very high	144.4mm very high	144.4mm very high	144.4mm very high
Mechanical Trail	126.3mm	126.3mm	126.3mm	126.3mm	126.3mm
Wheel Flop	61.2mm	61.2mm	61.2mm	61.2mm	61.2mm
Tire to Pedal Spindle	246.1mm 170 mm cranks	266.1mm 170 mm cranks	290.9mm 170 mm cranks	315.7mm 170 mm cranks	335.6mm 170 mm cranks
Pedal Spindle to Ground Clearance	124.8mm 170 mm cranks	124.8mm 170 mm cranks	124.8mm 170 mm cranks	124.8mm 170 mm cranks	124.8mm 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://www.btr-fabrications.com/products/belter-frame/#frame-options

Geometry