2026 Trek Bikes Marlin 4 Gen 3 Base

	XS	S	M	ML	L	XL	XXL
Stack	563mm	572mm	602mm	602mm	611mm	630mm	630mm
Reach	390mm	415mm	418mm	434mm	451mm	466mm	480mm
Stack to Reach Ratio	1.44:1	1.38:1	1.44:1	1.39:1	1.35:1	1.35:1	1.31:1
Seat Tube Length, C-T	340mm	370mm	419mm	444mm	470mm	521mm	559mm
Top Tube Length, Effective/Horizontal Center	551mm	579mm	602mm	618mm	638mm	659mm	673mm
Top Tube Slope	26deg	22.7deg	20.4deg	17.5deg	15.4deg	12.1deg	8.6deg
Head Tube Angle	66.5deg	66.5deg	69.5deg	69.5deg	69.5deg	69.5deg	69.5deg
Seat Tube Angle	73.8deg	73.8deg	71.9deg	71.9deg	71.9deg	71.9deg	71.9deg
Seat Tube Exit Angle	74deg	74deg	73deg	73deg	73deg	73deg	73deg
Head Tube Length	90mm	100mm	90mm	90mm	100mm	120mm	120mm
Bottom Bracket Drop	45mm	45mm	58mm	58mm	58mm	58mm	58mm
Bottom Bracket Height	308mm	308mm	314mm	314mm	314mm	314mm	314mm
Chainstay Length	433mm	433mm	438mm	438mm	438mm	438mm	438mm
Chainstay Length Horizontal	430.7mm	430.7mm	434.1mm	434.1mm	434.1mm	434.1mm	434.1mm
Front-Center	662.9mm	691.8mm	668.4mm	684.3mm	705.3mm	727.2mm	741.1mm
Front-Center Horizontal	661.3mm	690.3mm	665.9mm	681.9mm	702.9mm	724.9mm	738.9mm
Wheelbase	1092mm	1121mm	1100mm	1116mm	1137mm	1159mm	1173mm
Fork Offset/Rake	42mm	42mm	42mm	42mm	42mm	42mm	42mm
Trail	107.7mm very high	107.7mm very high	94.2mm very high	94.2mm very high	94.2mm very high	94.2mm very high	94.2mm very high
Mechanical Trail	98.7mm	98.7mm	88.3mm	88.3mm	88.3mm	88.3mm	88.3mm
Wheel Flop	39.4mm	39.4mm	30.9mm	30.9mm	30.9mm	30.9mm	30.9mm
Standover Height	658mm	692mm	748mm	758mm	757mm	769mm	804mm
Tire to Pedal Spindle	139.9mm 170 mm cranks	168.9mm 170 mm cranks	126.4mm 170 mm cranks	142.4mm 170 mm cranks	163.3mm 170 mm cranks	185.2mm 170 mm cranks	199.2mm 170 mm cranks
Pedal Spindle to Ground Clearance	138mm 170 mm cranks	138mm 170 mm cranks	144mm 170 mm cranks	144mm 170 mm cranks	144mm 170 mm cranks	144mm 170 mm cranks	144mm 170 mm cranks

	XS	S	M	ML	L	XL	XXL
Wheel Size	650B/27.5 in 584 mm BSD	650B/27.5 in 584 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	2.4in	2.4in	2.4in	2.4in	2.4in	2.4in	2.4in
Tire Outer Diameter	705.9mm	705.9mm	743.9mm	743.9mm	743.9mm	743.9mm	743.9mm
Bike Length with Tires	1797.9mm	1826.9mm	1843.9mm	1859.9mm	1880.9mm	1902.9mm	1916.9mm
Handlebar Width	690mm	720mm	750mm	750mm	750mm	750mm	750mm
Stem Length	35mm	35mm	50mm	50mm	50mm	60mm	70mm
Stem Angle	7deg	7deg	7deg	7deg	7deg	7deg	7deg

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.

Learn more about the Upright/Aggressive Scale

Category Trend

Hardtail Trail MTB

Source:https://www.trekbikes.com/gb/en_GB/bikes/mountain-bikes/cross-country-mountain-bikes/marlin/f/F321/marlin-4-gen-3/57361/5336958

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2026 Trek Bikes Marlin 4 Gen 3 Base

Geometry

Base Build

Stack and Reach vs. Category Trend