If you Google "Sur Ron upgrades" you will find approximately 4,000 Reddit threads, 200 YouTube videos, and at least one forum argument that has been going since 2019 about whether you should do the battery first or the controller first. I read all of it. I did some of it in the wrong order. Here's what I actually know now after going through the full upgrade path on my Light Bee.
The short version: there's a logical sequence to Sur Ron upgrades and if you follow it you save money and frustration. If you skip steps because you want the cool part first, you end up buying things twice. I bought things twice. Learn from me.
The Sur Ron Upgrade Stack, In Order
Start here and do not skip ahead. The stock Sur Ron Light Bee is genuinely capable in stock form — it's not a beginner bike pretending to be a trail bike. Ride it stock for at least a season before you start modifying. You need to understand what you're changing before you change it, or you won't know if the upgrade actually helped.
Step 1: Tires. The stock tires are the cheapest performance gain on the whole bike. Swap to a proper knobbly aggressive tire for the terrain you actually ride and the bike transforms immediately. Cost: $60-100 per tire. Impact: massive. Start here.
Step 2: Suspension setup. The stock suspension is adjustable and most people never touch it. Set your sag, adjust rebound and compression for your weight and riding style. Zero cost, meaningful improvement. Watch a setup video from a motocross suspension tech channel — the principles apply directly.
Step 3: 72V battery upgrade. This is the first real money upgrade and it's the right one to do before anything electrical. More voltage means every electrical component downstream performs better. Do this before the controller, before the motor. The stock motor on 72V is already a noticeably different bike. Read the full 72V battery upgrade breakdown here.
Step 4: Controller upgrade (BAC4000 or equivalent). Once the battery is done, the controller upgrade unlocks the full potential of the higher voltage. The stock controller is conservative by design — the BAC4000 opens up the power envelope and adds programmability. Full BAC4000 writeup here.
Step 5: Motor upgrade. With the battery and controller dialed, the stock motor becomes the limiting factor for riders who want maximum performance. The eRide Pro SS 2.0 is the upgrade most serious trail riders end up at. Do this last, not first.
Step 6: Brakes. More power requires more stopping power. After motor and battery upgrades, brake upgrades (larger rotors, higher-performance pads, aftermarket calipers) move from nice-to-have to genuinely important. Don't skip this step on a high-performance build.
The Upgrades That Are Actually Worth It vs. The Ones That Aren't
Worth it: tires, battery, controller, motor (in that order), brake upgrades, quality protective gear for the rider.
Probably not worth it unless you're deep: frame modifications, custom graphics, aftermarket footpegs (the stock ones are fine). These don't make you faster or safer — they just make the bike look different.
Genuinely skip: cheap "performance" controllers from unknown brands on eBay. I've seen these fry stock motors and batteries. The cost savings are real; so is the risk. Stick with known brands that have actual customer support and documentation.
The Sur Ron community on forums and Electric Motorcycle Forum is one of the better online communities for this stuff — people are genuinely helpful and the search function will surface most of the questions you have before you need to ask them.
Budget Reality Check
Full upgrade path from stock to fully built is going to run you $2,000-$3,500 depending on parts sourcing and whether you do the labor yourself. That sounds like a lot until you price out a Stark Varg or a KTM Freeride E-XC. At the end of the upgrade path you have a bike that genuinely competes with those machines on trail performance, at less than half the cost.
The bike we started with cost around $4,000 new. The upgrades added roughly $2,500. Total: $6,500 for a bike that performs at a level that would cost $12,000+ to buy new from a premium brand. That math works, especially if you enjoy the build process as much as the riding.
Kyler's Rawrr Mantis Mini, for comparison, is stock and will stay that way for now. He's nine. The stock motor is already terrifyingly fast for a nine-year-old. Some things don't need upgrading.
What We Were Wearing
Most of my Sur Ron upgrade weekends have happened in the garage in San Diego while wearing something from the e-moto collection. Not because I planned it that way, but because those are the shirts that are in the rotation when I'm doing anything electric dirt bike related. The designs come from the same adventures that motivated the upgrades — rides at McCain Valley, sessions at Red-Tailed Roost, watching Kyler disappear down a trail on the Rawrr and needing to actually keep up.
The Kyler Braap shirt exists because that kid is the reason I keep making the bike faster. Someone has to try to keep up with him.
The trip came first. The shirt came second. Do the upgrades in order and go ride something.