Reference

Rad Power Bikes RadExpand 5 Plus: parts and specs

Replacement parts and specs for the RadExpand 5 Plus folding bike: CST 20 x 4 tires, 20 x 4 Schrader tubes, Gemma GA-1000B hydraulic brakes with G2 pads and 180 x 2.3 mm rotors, 7-speed freewheel, battery and charger, with Rad's prices.

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

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This page lists the common replacement parts for the Rad Power Bikes RadExpand 5 Plus folding bike, sold from 2024. Specs are for the stock bike as sold; check your own bike before you buy. Full details are on the RadExpand 5 Plus product page. For the earlier RadExpand 5, see its own page under Common repairs.

Photo needed: The RadExpand 5 Plus folded, showing the hinge and the 20 x 4 tires.. 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: CST BFT 20" x 4.0", e-bike rated, with a puncture resistant liner. Rad's RadExpand Replacement Tire (CST BFT 20" x 4", wire bead) fits the RadExpand 5 Plus, $55, out of stock, read Nov 9, 2026. Rad's Kenda Krusade 20" x 4" also fits the RadExpand 5 Plus, $67.95, out of stock, read Nov 9, 2026.
Inner tube: Rad's 20" x 4" inner tube fits the RadExpand 5 Plus. Schrader valve, 5 to 30 PSI, $22, shown as shipping within 2 business days, read Nov 9, 2026.
Disc brake pads: Rad's Gemma G2 semi-metallic pads fit the RadExpand 5 Plus (2024 to 2025), $30 per set for one wheel, out of stock, read Nov 9, 2026.
Brake rotor: 180 mm x 2.3 mm. Rad's Brake Rotor, RadExpand 5 Plus, a Gemma GR-180 slotted rotor with mounting hardware, $30, out of stock, read Nov 9, 2026.
Disc brake caliper: Gemma GA-1000B hydraulic disc brakes.
Freewheel: 7-speed, 14 to 32 tooth, with a Shimano 7-speed rear derailleur and thumb shifter.
Hub motor: rear hub, 750W rated, 64 Nm.
Pedal assist sensor: torque sensor, 5 assist levels plus zero.
E-bike display: Rad custom color display with a USB-C port.
Throttle: half twist.
E-bike charger: 48V DC, 2 A. 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: 15 Ah, 720 Wh Safe Shield Advanced external battery, UL 2271. Rad's Safe Shield Advanced External Battery is standard on the RadExpand 5 Plus, $599, out of stock, read Nov 9, 2026. Use only the updated 2025 Rad charger.
E-bike lights: auto-on LED headlight and integrated taillight with brake light. Rad's RadExpand 5 Plus headlight, $45, out of stock, and RadExpand 5 Plus taillight, $38.50, back order, fit the RadExpand 5 Plus (2024), read Nov 9, 2026.
Grips: ergonomic rubber comfort grips.
Pedals: composite folding platform, 9/16" x 20 TPI.
Saddle: padded flat touring saddle.

Tools for common jobs

Hex keys: brake caliper and lever bolts, and checking the fold hinge and stem bolts.
Tire levers: changing the 20 x 4 tire or tube.
Floor pump with gauge: Rad's 20 x 4 tube is rated 5 to 30 PSI; pump to the range on your tire sidewall.
Axle nut wrench: removing the rear hub motor wheel to fix a flat.
Torque wrench: tightening axle nuts, rotor and brake bolts to your manual's values.
Brake pad spreader: resetting the hydraulic pistons before fitting new pads.
Brake bleed kit: bleeding the Gemma hydraulic brakes. Confirm the fluid with Rad support first.
Pedal wrench: swapping the 9/16 inch folding pedals.
Chain checker: checking chain wear on the 7-speed drivetrain.
Chain lube: regular chain care.

Where to buy

Rad's spare parts store: tires, tubes and brakes. Much was out of stock on Nov 9, 2026. For a controller, motor or display, ask Rad support.
Independent sellers: our parts suppliers page. A local shop can order and fit parts: find a shop.

Common repairs

Rad Power Bikes troubleshooting and Rad color display error codes
RadExpand 5 parts for the earlier model
Fix a flat on a rear hub motor wheel and set tire pressure
Replace disc brake pads and bleed hydraulic disc brakes
Rad battery and charger

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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