Reference

Rad Power Bikes RadWagon 4: parts and specs

Replacement parts and specs for the RadWagon 4 cargo bike: 22 x 3 tires and tubes, the tire recall check, Tektro Aries mechanical brakes with 180 mm rotors, 7-speed freewheel, charger and battery, with Rad's part links and prices.

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.

Tools

Parts

This page lists the common replacement parts for the Rad Power Bikes RadWagon 4 cargo bike. Specs are for the stock bike as sold; check your own bike before you buy. Full details are on the RadWagon 4 product page on Rad's Canadian store. Motor ratings differ by market, so this page leaves the motor rating to your manual and Rad support.

Photo needed: The RadWagon 4 from the side, with the battery in place. For photos, see Rad's RadWagon 4 product page linked above.. 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.

Tire recall: check yours first

Rad's RadWagon 4 tire recall page covers RadWagon 4 bikes in black, white and orange sold from September 2020 through August 2022, and spare 22 x 3 inch RadWagon 4 tires made by VEE Tire Co. Check for a misaligned rim strip or a tire with a ribbed sidewall, stop riding if yours is affected, and contact Rad for the free repair, which replaces both tires and both rim strips. See also RadWagon 4 tire keeps going flat.

Parts list

Tire: VEE Tire Co., 22" x 3". Rad's spare parts store had no 22 inch tire on Nov 9, 2026, so ask Rad support or a shop for a replacement.
Inner tube: 22" x 3". Rad's 22" x 3" inner tube fits the RadWagon 4 only, $22, out of stock, read Nov 9, 2026.
Disc brake pads: Rad's Tektro E10.11 organic pads fit all RadWagon models, $25, on back order, read Nov 9, 2026.
Brake rotor: 180 mm.
Disc brake caliper: Tektro Aries mechanical disc.
Brake lever: Rad's brake lever, a Tektro mechanical lever for all RadWagon models, $25, read Nov 9, 2026.
Freewheel: 7-speed, 11 to 34 tooth.
Throttle: twist grip throttle.
E-bike charger: 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: Rad's Safe Shield Advanced External Battery (15 Ah) is an upgrade for the RadWagon 4, $599, out of stock, read Nov 9, 2026. It works only with Rad's updated charger.
E-bike lights: integrated brake light powered by the main battery. Rad's RadRunner taillight fits the RadWagon 1 to 4, $27.50, and its standard headlight fits all Rad bikes except five early models, $44, both shown as shipping within 2 business days, read Nov 9, 2026.

Where to buy

Rad's own spare parts store: tires, tubes, brakes and lights. Many items showed as out of stock on Nov 9, 2026, so check back or ask Rad support.
For a part Rad doesn't list, such as a controller or motor, contact Rad support first, since the replacement comes from Rad.
Independent sellers are listed on our parts suppliers page.
A local shop can order and fit parts: find a shop.

Common repairs

Videos

RadWagon 4 Assembly: Rad Power Bikes from Rad Power Bikes: Rad's assembly video for the RadWagon 4, a good look at how the bars, front wheel, pedals and battery go on.

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.

Talk

Questions, things that worked for you, or something that looks wrong on this page.

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