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Gotrax G4, GMAX and GMAX Ultra: parts and specs

Replacement parts for the Gotrax G4, GMAX and GMAX Ultra from Gotrax's own parts store: the shared 10-inch tube and brake cable, the 10 x 2 front tire, chargers and the G4 battery, with prices read Nov 9, 2026.

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

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Battery and electrical safety. Lithium-ion batteries can catch fire if they're damaged or charged wrong. Never open a battery pack, and stop using any battery that's swollen, hot, wet or smells burnt. Every edit to this page is checked by a second person before it goes live.

This page lists the common replacement parts for the Gotrax G4, GMAX and GMAX Ultra, which share several wheel and brake parts. Parts and specs come from Gotrax's own G4 parts page and GMAX Ultra parts page, read Nov 9, 2026. Gotrax says parts are final sale and asks owners to contact its support to confirm fit before ordering.

Photo needed: A Gotrax G4 front wheel with the tire, tube valve and fender visible.. Add one

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

Parts list

  • Tire: Gotrax's front tire, 10X2 (54-152) fits the G4 and GMAX Ultra (and the front of the G Pro, G3 Plus and XR Elite Max), $25, read Nov 9, 2026.
  • Inner tube: Gotrax's 10 inch tire tube fits the G4, GMAX, GMAX Ultra and G7, $25, sold out, read Nov 9, 2026. The G4 parts page also lists an air extension tube for the valve at $11.
  • Brake cable: Gotrax's G4, GMAX and GMAX Ultra brake cable connects the brake lever and the brake caliper, $15, read Nov 9, 2026. The G4 parts page also lists a rear brake caliper for the G3, G4 and GMAX at $15.
  • E-bike charger: G4: Gotrax's 42V 2A charger also fits the G3, G Pro, XR Elite, XR Ultra and Eclipse, $30, sold out, read Nov 9, 2026. GMAX and GMAX Ultra: the GMAX Ultra parts page lists a separate 42V 3A charger, sold out when we read it.
  • E-bike battery: G4: the G4 parts page lists a detachable 36V 10.4Ah battery (shared with the Tour XP) at $199, sold out when we read it. Buy only the battery Gotrax lists for your model.

Tools for common jobs

  • Tire levers: to get the 10-inch tire off the rim when you replace the tube.
  • Floor pump with gauge: to refill the tubes to the pressure in your manual. Gotrax's tube page warns that underinflated tubes pinch flat.
  • Hex keys: for the M5 hexagon socket screws Gotrax lists for the G4 and GMAX, and for the brake caliper.
  • Cable cutters: to trim a new brake cable after you set its tension.
  • Multimeter: a shop or careful owner can confirm the charger puts out close to its 42 V rating. See check your charger.

Where to buy

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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