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Rad Power Bikes RadWagon 3: parts and specs

Replacement parts and specs for the 2018 RadWagon 3 cargo bike: Kenda K-Rad 26 x 2.3 tires at 50 to 60 PSI and Rad's tubes, Rad's Tektro pads and mechanical levers, the Rad charger and pedals, and torque values for the 2018 bike.

Last edited Nov 9, 2026 by Pedalwise team Edit History Add a subpage

The Pedalwise team started this page from official manuals, support pages and repair videos. Fixed this yourself, or spotted something wrong? Help improve it.

This page lists the common replacement parts for the Rad Power Bikes RadWagon 3, the 2018 RadWagon cargo bike. Specs are for the stock bike as sold; check your own bike before you buy. The 2018 RadWagon owner's manual has the full torque table. For later models, see RadWagon 4 parts and RadWagon 5 parts.

Photo needed: A 2018 RadWagon from the side, showing the long rear deck and the 26 inch wheels.. Add one

Electrical parts on this list must match this exact model, and they are fitted at the external plugs or by a pro. Never open the battery, controller, motor or display. For battery and charger trouble, start with battery won't charge and e-bike battery care.

Parts list

  • Tire: Kenda K-Rad 26" x 2.3", at 50 to 60 PSI front and rear. Rad's Kenda K-Rad 26" x 2.3" lists RadWagon model years 2015 to 2019, $55, ships within 2 business days, read Nov 9, 2026.
  • Inner tube: Rad's 26" x 2.3" inner tube, same fit list, rated 30 to 80 PSI, $22, ships within 2 business days, read Nov 9, 2026.
  • Disc brake pads: Rad's Tektro E10.11 organic pads cover this model, $25 for one set (one wheel), back order, read Nov 9, 2026. Order two sets for front and rear. They fit all RadWagon models.
  • Brake lever: Rad's brake lever is a Tektro mechanical lever covering this model, $25 each side, ships within 2 business days, read Nov 9, 2026. Both levers have cutoff switches that stop motor assist when you brake.
  • Hub motor: rear hub motor. Check the power rating on your motor before you order motor parts.
  • E-bike display: 3-button remote on the left bar with a backlit LCD battery gauge and assist levels 0 to 5.
  • E-bike charger: a round barrel DC plug goes into a port on the side of the battery, with 3 to 5 hours to charge. Rad's Rad Battery Charger (MY2025) fits all Rad bikes except the 2016 to 2017 RadMini 1 and the RadKick, $65, out of stock, read Nov 9, 2026.
  • E-bike battery: removable lithium-ion pack with a key lock. Check the voltage and capacity on your battery label and ask Rad support before buying a replacement.
  • E-bike lights: headlight with a daylight sensor, and a taillight with on, flash and off modes.
  • Pedals: left pedal is left-hand threaded, tightened to 35 Nm. Rad's aluminum pedals (part 400-00037) list the RadWagon 3, $27.50, ships within 2 business days, read Nov 9, 2026.

Tools for common jobs

  • Torque wrench: rear wheel 40 to 45 Nm, pedals 35 Nm, crank bolts 40 Nm, disc mounting bolts 6 Nm, disc caliper mount 10 Nm and stem clamp bolts 10 Nm.
  • Pedal wrench: fitting pedals to 35 Nm; the left side threads in the reverse direction.
  • Axle nut wrench: the rear wheel is bolted on. The nut size isn't stated, so check yours.
  • Hex keys: stem and saddle clamp bolts and brake bolts.
  • Tire levers and floor pump with gauge: tube changes and keeping 50 to 60 PSI.
  • Cable cutters: trimming brake cables after adjusting the mechanical brakes.
  • Chain checker and chain lube: regular chain care on a heavily loaded cargo bike.

Leave brake repair, wheel truing and any error code (21 to 25 or 30) to a mechanic or Rad support.

Where to buy

  • Rad's parts listings above. For a battery, controller or display, contact Rad support.
  • Independent sellers: our parts suppliers page. A local shop can order and fit parts: find a shop.

Common repairs

Sources

Stuck after these checks? Find a shop near you.

Need a pro?

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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