Trek Marlin+ 6 and 8: parts and specs
Replacement parts and specs for the Trek Marlin+ 6 and 8 hardtail e-MTB: 27.5 or 29 inch wheels by size, 180 mm rear rotor, 32T chainring, Bosch Active Line Plus, CompactTube 400, 2A charger and Purion 200.
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Specs are for the stock bike as sold; check your own bike before you buy. This page covers the Marlin+ 6 and Marlin+ 8 hardtails. Both use a Bosch Active Line Plus motor (50 Nm) with a Mini ISIS crank spindle; see Bosch motors explained. The rear hub is 148 x 12 mm and the frame accepts SRAM T-Type through its UDH hanger.
Electrical parts on this list must match this exact model and are fitted at the external plugs or by a pro. Never open the battery, motor, display or remote. Battery and motor service on the Bosch system is dealer work: a Bosch dealer reads faults with its diagnostic tool.
Parts list
- Tire: 27.5 inch wheels on XS and S, 29 inch on M and up; no mixed sizes. Maximum 2.6 inch wide, or 2.4 inch with fenders.
- Inner tube: the Marlin+ 6 has no tubeless ready rims, so it runs tubes.
- Tubeless sealant: the Marlin+ 8 comes with tubeless rims, tires, sealant, valves and strips.
- Brake rotor: 180 mm rear rotor on a direct post mount, adaptable to 203 mm. Front rotor size follows the fork.
- Chainring: 32T stock, up to 36T with a 52 mm chainline. 2x drivetrains don't fit.
- E-bike charger: 2A charger; about 2.8 hours to 50% and 6 hours to full. Bosch's smart system charger page covers the 2A unit and the CompactTube 400.
- E-bike battery: Bosch CompactTube 400 (400 Wh), removed only by a trained technician. Sizes S and up take a Bosch PowerMore 250 extender with a 100 mm cable. Bosch's integrated battery page covers the CompactTube 400.
- E-bike display: Bosch Purion 200 display and remote; another Bosch smart system display can replace it.
- E-bike lights: no front light routing in the frame. A rear light can run through the rack with Bosch cable EB12.120.00, 1400 mm.
- Saddle: 31.6 mm seatpost; the frame takes a dropper.
Tools for common jobs
- Hex keys: stem, seatpost and brake bolts.
- Torx keys: rotor bolts on six-bolt rotors.
- Tire levers: fitting tubes on the Marlin+ 6.
- Floor pump with gauge: seating tubeless tires on the Marlin+ 8 and setting pressure.
- Torque wrench: axle, stem and brake bolts, to the values on the part.
- Chain checker: catching chain wear early.
- Chain lube: after cleaning and wet rides.
Where to buy
- Bosch's smart system charger page and integrated battery page.
- Independent sellers: parts suppliers.
- A Trek retailer orders and fits parts for this bike: find a shop.
Common repairs
- Trek e-bike troubleshooting, Bosch troubleshooting and Bosch error codes
- Tubeless tires and sealant, set tire pressure and e-bike flat tire
- Replace disc brake pads, bed in disc brakes and clean and true brake rotors
- Clean and lube the chain and check and replace the chain
- Battery won't charge, e-bike battery care and store your battery for winter
Sources
Stuck after these checks? Find a shop near you.
If these steps didn't fix it, find a shop near you in our partner network. For battery or wiring trouble, look for shops marked Battery and electrical.
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