Electra Townie Go 7D: parts and specs
Replacement parts and specs for the Electra Townie Go 7D and 7D EQ: 26 or 27.5 x 2.35 balloon tires, 180 mm rotors, 42T, Hyena Gen 2 250 Wh battery, 2A charger and range extender.
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Specs are for the stock bike as sold; check your own bike before you buy. This page covers the Townie Go 7D and Townie Go 7D EQ, step-thru and step-over. It uses the Electra e-bike system with a Hyena Gen 2 battery and a 250 W nominal motor with 40 Nm of torque; see e-bike motor systems explained. It has Flat Foot Technology, and the EQ adds fenders, lights and a rear rack rated to 25 kg (55 lb); child seats don't fit. Total weight limit is 136 kg (300 lb) for bike, rider and cargo.
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, controller, motor or display. Battery removal is dealer work on this bike.
Parts list
- Tire: balloon tires, 26 x 2.35 inch on the step-thru and 27.5 x 2.35 inch on the step-over.
- Inner tube: match your frame's tire, 26 or 27.5 x 2.35 inch.
- Brake rotor: 180 mm rotors front and rear.
- Disc brake caliper: post mount calipers front and rear.
- Chainring: 42T.
- Pedal assist sensor: torque and cadence sensor built into the T47 bottom bracket.
- E-bike charger: 2A charger; about 2 hours to 50% and 4 hours to full from empty. Replacement charger SKU W5284218; Trek sells the Hyena Gen 2 Charger with US Cable (price not shown, read Nov 9, 2026).
- E-bike battery: Hyena Gen 2 In-Tube 250Wh Battery (price not shown, read Nov 9, 2026), about 1.6 kg, integrated and not removable by the rider. The Hyena Range Extender Battery (SKU 5271536, price not shown, read Nov 9, 2026) adds range.
- E-bike lights: wiring is in place for light set SKU 5271111; fenders (model 35723) go on first.
Tools for common jobs
- Hex keys: stem, seatpost, rack and fender bolts.
- Tire levers: fitting a new tube.
- Floor pump with gauge: keeping the balloon tires at the pressure on the sidewall.
- Torque wrench: rack and fender bolts, to the values on the part.
- Chain checker: catching chain wear early.
- Chain lube: after cleaning and wet rides.
Where to buy
- Trek's Hyena Gen 2 charger page, Hyena Range Extender page and Electra's Hyena Gen 2 In-Tube battery page.
- Electra MIK rear racks carry up to 25 kg.
- Independent sellers: parts suppliers.
- A Trek or Electra retailer orders and fits parts and does the yearly service visit: find a shop.
Common repairs
- Trek e-bike troubleshooting, which covers Hyena error codes
- 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
- Check your charger, battery won't charge, e-bike battery care and store your battery for winter
Sources
- trekbikes.com
- Hyena Gen 2 Charger with US Cable, trekbikes.com
- Hyena Gen 2 In-Tube 250Wh Battery, electra.trekbikes.com
- Hyena Range Extender Battery, trekbikes.com
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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