2026 Trek Bikes CheckOUT Base

	SM	MD	ML	L	XL
Stack	580mm	617mm	634mm	652mm	673mm
Reach	395mm	407mm	417mm	427mm	435mm
Stack to Reach Ratio	1.47:1	1.52:1	1.52:1	1.53:1	1.55:1
Seat Tube Length, C-T	440mm	470mm	520mm	540mm	560mm
Top Tube Length, Effective/Horizontal HT Top	564mm	589mm	597mm	613mm	628mm
Top Tube Slope	16.9deg	17.1deg	13.5deg	13.1deg	13deg
Head Tube Angle	68.8deg	69deg	69.4deg	69.5deg	69.4deg
Seat Tube Angle	74.6deg	74.2deg	73.7deg	73deg	72.6deg
Head Tube Length	83mm	122mm	138mm	159mm	182mm
Bottom Bracket Drop	70mm	70mm	70mm	68mm	68mm
Bottom Bracket Height	291mm	291mm	291mm	293mm	293mm
Chainstay Length	442mm	442mm	442mm	442mm	442mm
Chainstay Length Horizontal	436.4mm	436.4mm	436.4mm	436.7mm	436.7mm
Front-Center	648.4mm	672.2mm	684.2mm	701.6mm	716.5mm
Front-Center Horizontal	644.6mm	668.6mm	680.6mm	698.3mm	713.3mm
Wheelbase	1081mm	1105mm	1117mm	1135mm	1150mm
Fork Offset/Rake	45mm	45mm	45mm	45mm	45mm
Fork Length (Axle-To-Crown)	470mm	470mm	470mm	470mm	470mm
Trail	91.8mm very high	90.4mm very high	87.6mm very high	86.9mm very high	87.6mm very high
Mechanical Trail	85.6mm	84.4mm	82mm	81.4mm	82mm
Wheel Flop	30.9mm	30.2mm	28.9mm	28.5mm	28.9mm
Standover Height	772mm	804mm	840mm	861mm	861mm
Tire to Pedal Spindle	117.4mm 170 mm cranks	141.2mm 170 mm cranks	153.2mm 170 mm cranks	170.6mm 170 mm cranks	185.5mm 170 mm cranks
Pedal Spindle to Ground Clearance	121mm 170 mm cranks	121mm 170 mm cranks	121mm 170 mm cranks	123mm 170 mm cranks	123mm 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.trekbikes.com/us/en_US/bikes/road-bikes/gravel-bikes/checkout/f/F226/checkout-sl-5/57827/5338095

Geometry