2025 Rat Bikes Dad Rat Base

	Small	Medium	Large
Stack	657mm	676mm	694.5mm
Reach	460mm	490mm	520mm
Stack to Reach Ratio	1.43:1	1.38:1	1.34:1
Seat Tube Length, Unknown	480mm	505mm	530mm
Top Tube Length, Effective/Horizontal Unknown	648.5mm	684mm	719mm
Top Tube Slope	18.3deg	16.9deg	15.5deg
Head Tube Angle	69deg	69deg	69deg
Seat Tube Angle	74deg	74deg	74deg
Head Tube Length	130mm	150mm	170mm
Bottom Bracket Drop	63mm	63mm	63mm
Bottom Bracket Height	305.2mm	305.2mm	305.2mm
Chainstay Length Horizontal	430mm	430mm	430mm
Front-Center	728.2mm	765.4mm	802.4mm
Front-Center Horizontal	725.5mm	762.8mm	799.9mm
Wheelbase	1155.5mm	1192.8mm	1229.9mm
Fork Offset/Rake	35mm	35mm	35mm
Fork Length (Axle-To-Crown)	510mm	510mm	510mm
Trail	103.8mm very high	103.8mm very high	103.8mm very high
Mechanical Trail	96.9mm	96.9mm	96.9mm
Wheel Flop	34.7mm	34.7mm	34.7mm
Tire to Pedal Spindle	190.1mm 170 mm cranks	227.3mm 170 mm cranks	264.2mm 170 mm cranks
Pedal Spindle to Ground Clearance	135.2mm 170 mm cranks	135.2mm 170 mm cranks	135.2mm 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/dad-rat

Geometry