How to Upgrade Your Surron Ultra Bee's Rear Suspension in One Afternoon
Hey, Bryce here! The Surron Ultra Bee is one of the best-handling e-motos out of the box, but the stock rear shock is the first thing that holds it back once you start riding it like a real dirt bike. The good news: swapping the rear suspension is a bolt-on job you can knock out in an afternoon in your own garage, no suspension shop required. Here's exactly how we do it on our own Ultra Bee builds.
Time estimate: 1.5 to 2.5 hours, depending on whether you upgrade the triangle and linkage while you're in there (you should).
Tools You'll Need
Keep it simple. You'll want a bike stand or jack to get the rear wheel off the ground, a set of metric Allen keys and sockets (mostly 6mm, 8mm, and a 17mm for the axle-size hardware), a torque wrench, a punch or long bolt to knock pivot bolts through, and a tube of fresh grease for the linkage bearings. A second set of hands makes lifting the swingarm easier but isn't required.
Step 1: Lift the Bike and Remove the Stock Shock
Get the Ultra Bee up on a stand so the rear wheel hangs free and the suspension is fully extended (no load on the shock). Support the swingarm with a jack or a strap so it doesn't drop when you pull the bolts. Remove the upper shock bolt first, then the lower shock bolt. The stock unit will come straight out. Take a second to inspect your linkage and triangle pivot bearings while everything is apart — if there's any play, notch, or rust, now is the time to fix it.
Step 2: Upgrade the Triangle and Linkage While You're In There
This is the step most riders skip and later regret. The stock Ultra Bee triangle runs metal-on-metal bushings that wear and introduce slop, which no shock can tune out. Since you already have the shock out, swap the triangle now. A billet upgrade like the Heavy Hitter Ultra Bee Billet Racing Triangle fits all shocks and tightens up the whole rear end, while the EBMX Upgraded Triangle is the race-proven option with hardened shear inserts. Running a Sirris shock? Pair it with the matching Sirris Triangle for guaranteed clearance. Refresh or upgrade the Warp 9 Ultra Bee Rear Linkage at the same time if your pivots are worn — pack every bearing with fresh grease before you reassemble.
Step 3: Install Your New Shock
With a fresh triangle and greased pivots, bolt in your new shock. For most Ultra Bee riders the two shocks worth your money are the EXT REA MX Shock — a direct bolt-on with 4-way LSC/HSC/LSR/HBC adjustment, pre-tuned by EXT to your weight — or the Sirris R46 Shock, a 46mm-piston unit purpose-built for e-moto. Both drop in without hacking anything up. Thread the upper bolt first, then line up the lower mount (this is where a jack under the swingarm earns its keep) and start the lower bolt by hand so you never cross-thread it. Torque both to spec — snug and secure, not gorilla-tight — and double-check the shock body has clearance through the full stroke by cycling the suspension by hand.
Step 4: Set Your Sag and Dial It In
A great shock set up wrong rides worse than a stock one. Get your race sag (the amount the suspension compresses with you on the bike in full gear) into the recommended window using the preload collars — for most Ultra Bee riders that lands around 95 to 105mm. Then set your rider sag and adjust compression and rebound in small clicks, one at a time, riding between changes so you actually feel what each click does. Start soft on rebound and firm it up until the rear stops kicking on square-edge hits. Write down your settings so you can get back to a baseline.
You're Done — Go Ride It
That's the whole job. A fresh shock on a tight triangle completely changes how the Ultra Bee tracks under braking, holds a line through chop, and puts power down out of corners. If you want the full picture, browse the complete Suspension collection or grab everything at once in the Surron Ultra Bee Upgrade Package. Everything is in stock and ships fast from the USA — head over to throttleco.store and build the Ultra Bee that earns a second look at every trailhead.