	S	M	L	XL
Stack	596.7mm	630.7mm	639.6mm	657.5mm
Reach	430mm	448.9mm	478.9mm	518.9mm
Stack to Reach Ratio	1.39:1	1.4:1	1.34:1	1.27:1
Seat Tube Length, C-T	390mm	400mm	435mm	470mm
Top Tube Length, Effective/Horizontal Center	561.1mm	588.8mm	624.5mm	669.3mm
Top Tube Slope	22.8deg	24.2deg	20.5deg	17.7deg
Head Tube Angle	63.5deg	63.4deg	63.4deg	63.4deg
Seat Tube Angle	77.6deg	77.5deg	77.2deg	76.7deg
Head Tube Length	110mm	110mm	120mm	140mm
Bottom Bracket Drop	10mm	27mm	27mm	27mm
Bottom Bracket Height	284.5mm	1439mm	1439mm	1439mm
Chainstay Length	434mm	440mm	440mm	445mm
Chainstay Length Horizontal	433.9mm	439.2mm	439.2mm	444.2mm
Front-Center	770.8mm	794.4mm	828.8mm	872.7mm
Front-Center Horizontal	770.7mm	793.9mm	828.3mm	872.3mm
Wheelbase	1204.6mm	1233.1mm	1267.5mm	1316.5mm
Fork Offset/Rake	43mm	43mm	43mm	43mm
Trail	98.8mm very high	686mm very high	686mm very high	686mm very high
Mechanical Trail	88.4mm	613.4mm	613.4mm	613.4mm
Wheel Flop	39.5mm	274.7mm	274.7mm	274.7mm
Standover Height	771mm	776mm	770mm	769mm
Tire to Pedal Spindle	316.3mm 160 mm cranks	-831.6mm 160 mm cranks	-797.2mm 160 mm cranks	-753.3mm 160 mm cranks
Pedal Spindle to Ground Clearance	124.5mm 160 mm cranks	1279mm 160 mm cranks	1279mm 160 mm cranks	1279mm 160 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://geometrygeeks.bike/bike/trek-slash-2025/

2025 Trek Bikes slash + Base

Geometry