TREK FX+1 Midstep

FX+ 1 Midstep is a lightweight fitness e-bike with a confidence-boosting frame that’s easy to hop on and go. Pedal assist up to 32 km/h delivers a smooth, natural boost, while the thumb throttle makes acceleration easy and intuitive. Gravel tires add versatility, and integrated turn signals and a brake light help you stand out in traffic.

Specifications apply to all sizes unless listed separately.

Frameset

• Frame: Alpha Gold Aluminum, internal cable routing and battery, rack and fender mounts, flat-mount disc brake, kickstand mount, 144.5 mm OLD hub motor spacing
• Fork: Alloy, internal brake routing, fender and rack mounts, ThruSkew 5 mm bolt-on skewer

Wheels

• Front hub: Alloy low-flange, 6-bolt disc, 36-hole, quick release
• Front skewer: 132 × 5 mm QR, ThruSkew
• Rims: Alloy double-wall, 36-hole
• Tires: Bontrager GR0 Comp, wire bead, 60 TPI, 650 × 50 mm
• Maximum tire size: 650 × 50 mm

E-System

• Battery: 520 Wh, integrated in downtube
• Charger: Trek Easy Mag, 2.7 A, 54.9 V output, 100–240 V AC input
• Display: LCD
• Motor: Hub drive, 60 Nm, 500 W, 36-hole, black
• E-bike classification: Class 2
• Maximum assist speed: 32 km/h

Drivetrain

• Shifter: Shimano M315, 8-speed
• Rear derailleur: Shimano ESSA U2000
• Crank: Alloy, 40T steel chainring, 170 mm
• Cassette: Shimano HG400, 11–45T, 8-speed
• Chain: KMC Z8.3
• Pedals: Bontrager City
• Maximum chainring size: 1×, 40T

Components

• Saddle: Bontrager Sport Women’s
• Seatpost: Bontrager alloy, 31.6 mm, 12 mm offset; 330 mm for sizes S and M, 400 mm for size L
• Handlebar: Bontrager alloy, 31.8 mm, 15 mm rise; 690 mm wide for sizes S and M, 720 mm for size L
• Grips: Bontrager XR Endurance Comp, lock-on
• Stem: Bontrager Elite, 31.8 mm, Blendr compatible, 7°; 80 mm for sizes S and M, 90 mm for size L
• Brakes: Rush BH-286 hydraulic disc, 180 mm rotor
• Maximum rotor size: 180 mm front and rear
  

Geometry

All measurements provided in cm unless otherwise stated.

Sizing table

Frame size number	Frame size letter	Wheel size	A — Seat tube	B — Seat tube angle	C — Head tube length	D — Head angle	E — Effective top tube	F — Bottom bracket height	G — Bottom bracket drop	H — Chainstay length	I — Offset	J — Trail	K — Wheelbase	L — Standover	M — Frame reach	N — Frame stack
45cm	S	27.5"	40.8	73.5°	15.5	70.0°	56.9	28.6	7.0	46.8	5.0	7.6	109.2	65.5	38.2	60.4
50cm	M	27.5"	46.3	73.0°	17.0	70.5°	57.4	28.6	7.0	46.8	5.0	7.3	109.5	67.2	38.5	62.0
55cm	L	700c	50.7	73.0°	20.0	71.0°	59.2	28.6	7.0	46.8	5.0	6.9	110.9	69.3	39.3	65.0