How to Make Your Sur-Ron Faster
The Complete Upgrade Path

From your first $20 sprocket swap to a full 72V race build — every upgrade ranked by impact, cost, and complexity. Stop guessing. Start building.

01 The Upgrade Philosophy

Before you spend a dollar, internalize this: the upgrade order matters more than the upgrades themselves.

The #1 mistake new Sur-Ron owners make is buying a $1,200 controller before addressing the brakes that need to stop 20 mph faster, or the suspension that can’t handle the extra power through rough terrain. More power without better control doesn’t make you faster — it makes you a faster crash.

The second mistake is upgrading everything at once. Each mod changes how the bike feels. If you install a controller, battery, and suspension simultaneously, you won’t know which change caused which improvement (or problem). Build incrementally. Ride between upgrades. Learn the bike at each stage.

The third mistake is chasing top speed when most riders would benefit more from torque, range, and suspension. Unless you’re racing on a long straightaway, the difference between 46 mph and 65 mph is academic — you’ll rarely use it on actual trails. Better acceleration, more range, and suspension that lets you carry speed through rough sections will make you faster in the real world.

02 Tier 1: Free & Cheap ($0–$50)

Tune Your Stock Suspension ($0)

Your Sur-Ron shipped with suspension tuned for an “average” 150 lb rider on smooth terrain. If that’s not you, the bike isn’t performing anywhere near its potential — and it costs nothing to fix.

Set your sag first: sit on the bike in full gear with feet on the pegs. Have a friend measure how much the fork and shock compress. You want 20–30% of total travel as sag. Adjust preload (the large collar or dial on top) until you’re in range. Then set rebound (bottom of the fork/shock) — start fully clockwise (slow), then click out 2–3 clicks at a time until the bike recovers smoothly from bumps without bouncing or packing down. Compression damping (top of the fork/shock) follows the same approach — start firm, back off until the ride feels plush without bottoming.

This alone can transform the bike’s handling.

Rear Sprocket Swap ($20–$50)

The simplest, cheapest performance mod you can make. The stock Sur-Ron runs a 48-tooth rear sprocket. Changing sprocket size tunes the balance between acceleration and top speed.

Smaller sprocket (44–46T): Higher top speed, less low-end torque. Adds 3–5 mph to top speed. Best for: fire roads, commuting, flat terrain. Trade-off: weaker hill climbing and slower off-the-line acceleration.

Larger sprocket (50–54T): More low-end torque, lower top speed. Punchier acceleration, better hill climbing. Best for: technical trails, steep terrain, riders over 200 lbs who need more grunt. Trade-off: loses 3–8 mph of top speed.

A 52T sprocket is the most popular “all-around” upgrade — it adds noticeable torque for trail riding while only sacrificing 2–3 mph of top speed that you’d rarely use on dirt anyway.

What you need: New sprocket ($15–$25), possibly a new chain if changing more than 4 teeth ($15–$25), basic wrenches.

Belt-to-Chain Conversion ($100–$200)

If you plan to add any power mods, do this first. The stock Gates toothed belt is the #1 failure point on the Sur-Ron. Belts snap under increased power loads, and a snapped belt at speed is dangerous.

Chain conversion kits from companies like GritShift and Luna Cycle replace the belt with a #25H chain, jackshaft sprocket, and hardware. Installation is straightforward wrench work — no electrical knowledge needed. The chain is slightly noisier than the belt but dramatically more durable and handles 3–5x more power without issue.

What you need: Chain conversion kit ($100–$200), basic tools. Allow 1–2 hours for first-time installation.

03 Tier 2: First Real Mods ($100–$500)

Upgraded Brake Pads & Rotors ($50–$200)

Stock Sur-Ron brake pads are adequate for stock power. They become inadequate the moment you add speed or weight. Metallic/sintered brake pads from brands like TRP or Galfer provide better initial bite and more consistent stopping in wet/muddy conditions. Upgrading to 220mm or 250mm floating rotors (from the stock 203mm) provides 20–40% more stopping surface and better heat dissipation.

Quality Tires ($60–$120 per set)

Stock tires are generic and hard-compound. A good set of knobby tires (Maxxis, Kenda, Dunlop) dramatically improves grip in every condition. This is the cheapest way to improve cornering confidence and braking distance. Match the tire compound and tread pattern to your primary terrain — soft/intermediate for loamy trails, hard-pack for rocky/dry conditions.

Foot Pegs ($30–$80)

Stock pegs are small and slippery. Aftermarket pegs (Warp9, GritShift, CR80 pegs) are wider, grippier, and provide dramatically better control and comfort. This is a subtle upgrade that makes a surprisingly big difference in riding confidence, especially standing up through rough terrain.

Handlebars, Risers & Grips ($40–$150)

If the stock riding position doesn’t fit your body, everything else suffers. Taller riders benefit from bar risers ($30–$50) that raise the handlebars 2–3 inches. Wider bars provide more leverage for steering. Lock-on grips eliminate twist and improve comfort. A simple ergonomic fit transforms how the bike feels on long rides.

04 Tier 3: The Power Upgrade ($500–$2,000)

This is where the Sur-Ron goes from “fun toy” to “legitimate motorcycle.” You’re modifying the electrical system now — understand the implications:

• You will void your factory warranty. Accept this before proceeding.
• Power upgrades are multiplicative. A controller alone helps. A controller + battery is transformative. Controller + battery + motor is a different bike entirely.
• Each power upgrade stresses the next component in the chain. A bigger controller stresses the motor. A higher-voltage battery stresses the controller. Plan the full build, even if you execute it in stages.

Controller Upgrade: The Single Biggest Performance Mod

The stock Sur-Ron controller limits the motor to roughly 6–8 kW. The motor itself can handle significantly more with proper thermal management. An aftermarket controller uncaps this potential.

EBMX X-9000 V3 (~$1,164–$1,400): The gold standard. Supports 48V–81V, 6 kW to 50 kW output, FOC sinewave control, Bluetooth app for tuning throttle curves and ride modes, 6 customizable power modes, regenerative braking, and the new Wheel Lift Assist feature. Compatible with stock and aftermarket motors. Plug-and-play harness for the Light Bee X. This is the controller most serious builders choose because it’s future-proof — it’ll handle any battery or motor you throw at it later.

Torp TC500 (~$600–$800): Great mid-range option. Designed to work safely with the stock battery by communicating with the BMS. Significant power increase without requiring a battery upgrade. Good choice if you want more power but aren’t ready for a full 72V build.

Torp TC1000 (~$900–$1,200): The performance option. Supports higher voltages and currents than the TC500, capable of extreme builds. Smooth control with advanced app tuning. Has been used in builds exceeding 100 mph (with appropriate motor and battery).

KO Moto (~$400–$600): Budget plug-and-play option. Integrates with the stock display without extra wiring. Less tunability than EBMX or Torp, but provides a meaningful power boost at an accessible price. Good for riders who want “more” without diving deep into tuning.

Battery Upgrade: Unlocking Real Power

This is where the money is — and where the transformation happens. Upgrading from the stock 60V/40Ah pack to a 72V (or higher) aftermarket battery unleashes the controller’s full potential and provides more range, more sustained power, and less voltage sag under load.

EBMX 72V 42Ah (~$1,800–$2,200): The most popular upgrade. NMC pouch cells, fully potted in a stainless steel case, fits the stock battery compartment (with included extended battery clip for the stock cover). Pairs perfectly with the X-9000 controller. Requires a separate 72V charger (~$150–$200). This battery supports up to 15 kW tuning on the stock motor.

Nexbat 72V 50Ah Standard (~$2,000–$2,300): True stock fitment (no cover extensions needed). Samsung 50S cells for balanced range and reliability. Compatible with EBMX X-9000, Torp TC1000, and Nucular controllers.

Nexbat 72V 50Ah Pro (~$2,200–$2,500): Same fitment as Standard but with Molicel P50B cells — higher discharge rate for more aggressive riding. The premium choice for riders who push hard and want maximum sustained output.

NAB 72V 57Ah Expedition (~$2,200): The range king. Largest capacity battery in stock fitment. Ideal for riders who prioritize all-day range over peak power output.

DHS 80V 45Ah (~$2,499): For the extreme builders. 80V system pushes the power ceiling even higher. Requires compatible controller settings. 44 kW peak output capability.

Critical note: 72V batteries are NOT compatible with the stock 60V controller or charger. You need an aftermarket controller and a 72V charger. Plan these as a package — controller + battery + charger.

Motor Upgrade: Raising the Ceiling

Most riders don’t need a motor upgrade. The stock motor handles 12–15 kW with an aftermarket controller and battery before thermal limits become a concern. But if you’re building a race bike or want sustained high output without overheating:

EBMX XLB-60 Core (~$1,000): Drop-in replacement for the stock motor. Handles higher power more efficiently with better thermal management. Available in Core (trail) and Race (competition) variants.

EBMX XLB-60 Race (~$1,250): Higher-output version of the XLB-60. Built for sustained maximum power delivery in race conditions.

Torp TM25 IPM (~$800–$1,000): Interior Permanent Magnet design (same technology as the Talaria MX4 motor). Handles high voltage and current efficiently. Excellent torque and durability. Pairs perfectly with the TC1000 controller.

05 Tier 4: Full Build ($2,000–$5,000+)

At this level, you’re building a custom electric motorcycle from a Sur-Ron platform. A complete Tier 4 build typically includes:

A full Tier 4 build on a $4,500 Sur-Ron LBX base can result in a bike with 25–40+ horsepower, 55–65+ mph top speed, dramatically improved suspension and braking, and a ride feel that competes with bikes costing $8,000–$12,000 new.

06 Suspension Deep Dive

Suspension is the most impactful upgrade for actual trail speed. A bike that can carry speed through rough sections is faster in the real world than one with 10 extra horsepower and bottoming suspension.

Budget Path (~$400–$800)

Fork: FastAce ALX13RC 2.0 (~$400–$600). 200mm travel, compression and rebound damping, 37mm stanchions, coil spring. Fits stock plastics. Dramatically stiffer and more controlled than stock KKE forks. Available with different spring rates — choose 60 lbs for riders over 200 lbs.

Shock: FastAce BDA53RC (~$200–$350). 3-way damping (spring, air, oil). Compression and rebound adjustability. Choose 550 lbs spring for most adult riders, 450 lbs for lighter riders. Direct bolt-on replacement — no modifications needed.

Premium Path (~$1,500–$3,000+)

Fork: EXT Ferro (~$1,200–$1,500). 36mm steel stanchions, EXT’s HS3 air spring system, advanced damping control. This is considered the best fork available for the Sur-Ron platform. Available with drop crown option for adjustable ride height.

Shock: EXT Arma MX (~$800–$1,200). Redesigned pistons, 4-way adjustability. The highest-performing aftermarket shock on the market for the Light Bee. Completely transforms rear-end stability and compliance.

Alternative premium: RFloXa Hawk31 Pro fork for riders who want an inverted oil-spring design with larger stanchion diameter.

The Suspension Rule

Whatever you spend on power upgrades, plan to spend at least 30–50% of that amount on suspension. A 15 kW controller on stock KKE suspension is like putting a V8 in a car with shopping-cart wheels.

07 Brakes: The Upgrade Everyone Forgets

Stock Sur-Ron brakes are adequate at stock speed. At 55+ mph with a 72V build, they become genuinely dangerous. Upgrading brakes should be mandatory for any Tier 3 or Tier 4 build.

TRP DH-R EVO (~$250–$350 for a set): Purpose-built for high-speed e-moto use. Powerful initial bite, excellent modulation, consistent performance when hot. The most popular brake upgrade in the Sur-Ron community.

Formula E-Moto (~$300–$450 for a set): Designed specifically for electric motorcycles. Massive stopping power with excellent lever feel. Premium option for serious builds.

Budget option: Keep stock calipers but upgrade to 220mm or 250mm floating rotors ($50–$100 each) and sintered metallic pads ($20–$40). This alone provides a meaningful improvement for Tier 2 builds.

08 Protection & Ergonomics

Crash protection saves money long-term. A $50 bash guard saves a $1,800 battery from a rock strike. The most commonly recommended protection upgrades:

Frame guards/sliders ($30–$80): Protect the frame rails from crash damage. Essential for any bike that sees trail use.

Bash guard ($40–$100): Protects the underside of the battery and motor from rock impacts. Should be one of your first purchases regardless of build level.

Chain guide ($30–$60): Keeps the chain from jumping off during aggressive riding, especially important after a chain conversion.

Footpeg springs ($15–$25): Stock springs are weak and pegs fold under hard landings. Upgraded springs (Pro Circuit or similar) keep pegs firmly in place.

Seat upgrade ($50–$150): Stock seat is thin and uncomfortable for rides over 30 minutes. Aftermarket seats with better foam density and grip fabric reduce fatigue and improve bike control.

09 The Recommended Build Order

If you’re starting from a stock Sur-Ron Light Bee X and building over time, here’s the order that maximizes enjoyment at each stage:

Stage 1 — Foundation ($100–$300): Suspension tuning (free) → chain conversion → sprocket swap → brake pads → foot pegs. Ride this for a month. Learn the bike.

Stage 2 — Confidence ($200–$500): Tires → brake rotor upgrade → handlebars/risers/grips → bash guard and frame protection. Ride this for a month.

Stage 3 — Power ($1,500–$3,000): Controller (EBMX X-9000 or Torp) → 72V battery + charger. Install together for immediate results. Ride this extensively and tune via the app.

Stage 4 — Control ($500–$1,500): Suspension upgrade (fork + shock) → brake caliper upgrade. Match the chassis to the new power level.

Stage 5 — Polish ($500–$1,500, optional): Motor upgrade (if hitting thermal limits) → wheels → seat → cosmetics.

Total investment path: $2,800–$6,800 over 4–6 months, with a dramatically improved riding experience at every stage.

10 FAQ