Finding Hiboy Electric Bike Parts: A Guide for Owners

Hiboy e-bikes—especially the S2, S2 Pro, and KS6 Pro—are popular commuter choices, but the brand’s official website doesn’t sell replacement parts directly. That leaves owners piecing together parts from Amazon, eBay, and third-party sellers. This guide covers where to find compatible parts, what they should cost, which components swap between models, and when to stop DIY repairs and call in a professional.

What Wears Out First and What It Costs

Most Hiboy owners will replace parts in this order: brake pads, inner tubes and tires, brake levers, then the charger. Batteries fail less often but are the most expensive single component you’ll ever buy for the bike.

Part	Typical Price Range	Where to Find It	Compatibility Notes
Battery (36V, 7.5Ah–10Ah)	$180–$300	Amazon, eBay, Hiboy’s Amazon storefront	S2 and S2 Pro batteries are not interchangeable; check connector type and mounting bracket
Charger (36V, 2A)	$25–$45	Amazon, Hiboy official store	Standard 3-pin XLR connector on most models; verify polarity before buying
Brake pads (disc, 160mm rotor)	$10–$25 per pair	Amazon, generic e-bike parts sellers	Most Hiboy models use standard 160mm rotors with resin pads; compatible with many generic e-bike pads
Brake levers (with motor cutoff sensor)	$15–$35 per pair	Amazon, CFTGIW and similar aftermarket brands	The motor cutoff wires must match your controller’s connector (usually 2-pin Julet or waterproof)
Inner tubes (20″ x 2.125″ or 14″ x 2.125″)	$8–$15 each	Amazon, bike shops	S2 Pro uses 14″ tubes; KS6 Pro uses 20″ tubes; check your tire sidewall before ordering
Tires	$20–$45 each	Amazon, Hiboy storefront	S2 Pro: 14″ x 2.125″; S2: 8.5″ solid (no tube needed); KS6 Pro: 20″ x 2.125″
Display/controller	$40–$90	eBay, AliExpress, Hiboy customer service	Controller connectors vary by production year; take photos before ordering

Battery and Charger Compatibility: Where Owners Lose Money

The battery is where most Hiboy owners make expensive mistakes. The S2 and S2 Pro look similar at a glance, but their batteries are not cross-compatible. The S2 uses a 36V 7.5Ah battery with a slide-in mount on the rear rack. The S2 Pro uses a 36V 10Ah battery that mounts vertically on the seat tube. The connectors differ, and the mounting brackets don’t line up. A battery that’s even 1cm too long won’t seat properly, and forcing it can bend the pins.

How to verify compatibility before buying: Check three things—voltage (must be 36V), connector type (Hiboy typically uses a 5-pin or 6-pin proprietary connector), and physical dimensions. If you’re unsure, contact Hiboy customer service with your model number and production year. They can confirm which battery part number matches your bike.

For chargers, the standard is simpler. Most Hiboy models use a 36V 2A charger with a 3-pin XLR connector. If you’re replacing a lost charger, match the voltage and amperage exactly. Using a 48V charger on a 36V battery can cause overheating and permanent cell damage. The connector polarity is printed on the charger label; verify it matches the battery’s input before plugging in.

Brakes and Tires: Where Generic Parts Work Fine

Hiboy doesn’t manufacture its own brake calipers or pads—it sources them from standard e-bike suppliers. That means you can often replace worn pads with generic 160mm disc brake pads from any e-bike parts seller. Look for resin or semi-metallic pads. Resin offers better stopping power in wet conditions, while semi-metallic lasts longer but can be noisier.

Brake levers are the tricky part. The levers on Hiboy e-bikes include a motor cutoff switch that kills power when you squeeze the brake. If you replace the lever with a non-electric version, the motor will keep running while you brake—a dangerous situation, especially at intersections. When buying aftermarket levers, look for ones explicitly labeled “e-bike brake lever with motor cutoff” and check the connector type. The CFTGIW brake handle kit on Amazon includes both left and right levers with the cutoff wiring, and it’s compatible with many 36V hub-motor e-bikes. But verify your controller’s connector before ordering; a mismatch means the cutoff won’t work.

Tire sizing is non-negotiable. The S2 Pro uses 14″ x 2.125″ tires; the KS6 Pro uses 20″ x 2.125″. The S2 (original) uses 8.5″ solid tires that don’t need tubes. If you order the wrong size, the tire won’t seat on the rim, and riding on an improperly seated tire risks a blowout at speed. Check the sidewall of your current tire—the size is printed there. If the sidewall is worn or faded, measure the rim diameter with a tape measure before ordering.

Official Store vs. Amazon Aftermarket: How to Choose

Hiboy sells parts through its Amazon storefront and customer service channels, but availability fluctuates. Here’s how to decide where to buy based on the part:

Hiboy’s official Amazon storefront:

• Pros: Guaranteed fit for your specific model; warranty coverage on the part; correct connectors
• Cons: Often out of stock; higher prices; slower shipping than Prime-eligible third-party sellers
• Best for: Batteries, controllers, and displays—components where a mismatch is expensive

Amazon aftermarket sellers:

• Pros: Lower prices; faster shipping; wider selection
• Cons: Fit is not guaranteed; quality varies; returns can be difficult
• Best for: Brake pads, tubes, tires, and generic accessories

eBay and AliExpress:

• Pros: Lowest prices; hard-to-find older parts
• Cons: Long shipping times (2–4 weeks from China); no warranty; risk of counterfeit batteries
• Best for: Discontinued models or parts Hiboy no longer stocks

Cross-Model Compatibility: What Swaps Between Hiboy Models

If you own multiple Hiboy e-bikes or are considering an upgrade, here’s what transfers:

• Chargers: The 36V 2A charger works across the S2, S2 Pro, and KS6 Pro—all use the same voltage and XLR connector.
• Brake pads: All disc-brake Hiboy models use 160mm rotors, so pads are interchangeable.
• Tires: Not interchangeable across models. The S2 Pro (14″), S2 (8.5″ solid), and KS6 Pro (20″) each require their own size.
• Batteries: Not interchangeable between S2 and S2 Pro. The KS6 Pro uses a 36V 7.5Ah battery with a different mounting system—check before assuming compatibility.
• Controllers and displays: Generally model-specific. Production year changes can alter connector types, so always photograph your existing controller before ordering.

When to Stop DIY and Call a Professional

Some parts are worth replacing yourself; others aren’t. Battery replacement is doable if you’re comfortable with basic tools—the S2 Pro’s battery slides out with a key release. But if your battery won’t hold a charge and you’re considering opening the casing to replace individual cells, stop. Lithium-ion cell replacement requires spot welding and a battery management system (BMS) that matches the original. A poorly rebuilt battery can overheat, swell, or catch fire. Replace the whole unit instead.

Here’s your stop threshold: If the battery casing shows any swelling, deformation, or heat damage, do not attempt any repair. Stop using the battery immediately, dispose of it at a certified e-waste facility, and order a replacement. A swollen lithium-ion battery is a fire risk, and no DIY repair is worth that.

Similarly, controller replacement involves disconnecting multiple wiring harnesses and matching connector types. If you’re not confident identifying a 2-pin Julet connector from a 3-pin waterproof connector, have a local e-bike shop do the swap. Labor typically runs $50–$100, which is cheaper than a fried controller from a wiring mistake.

Final Checklist Before You Order

1. Confirm your exact model (S2, S2 Pro, KS6 Pro, or other) and production year if possible.

2. Check the part’s voltage and connector type against your existing component.

3. Measure the physical dimensions—especially for batteries and tires.

4. Read recent reviews for aftermarket parts, focusing on fitment complaints.

5. Keep your receipt and verify the seller’s return policy before purchasing.

Hiboy’s lack of a dedicated parts page is frustrating, but the aftermarket fills the gap. Stick to verified compatibility, avoid bargain-bin batteries, and you’ll keep your e-bike rolling for years.