It only has to survive a couple of runs down a village hill. Keep it solid, keep the brakes strong, keep the design daft. Here's how to get going.
Building your first cart can feel intimidating, but don't panic — it only needs to survive two or three runs down the course. That said, it does need to handle a sharp corner or two, hold up under heavy braking at the finish, and be sturdy enough that you'd happily climb into it yourself.
We've pulled together the basics below — sourcing parts, wheels, brakes, fabrication and the safety non-negotiables — to help you start sketching.
Carts come in all shapes and sizes. Over the years builders have turned push bikes, ride-on lawnmowers, kids' pedal karts — even a piano — into race-day machines. Push-bike-based carts are the easiest starting point, and you'll often find a usable donor bike through friends, neighbours or the village WhatsApp.
A word of warning — don't expect to "rescue" one from the local tip. Most won't let anything leave the site once it's through the gate.
One of the trickier parts to get right. Bike wheels are everywhere, but they're not designed for the side loads a cornering cart puts on them. Pick based on the weight of your cart and rider:
Absolutely critical — your cart must have efficient brakes that can stop the whole thing under load at the finish.
Skip kids' bike brakes. The small levers don't have the leverage or travel to stop an adult-weight cart, and swapping in adult levers just bends the calipers. Adult bike brakes work well if installed properly. Moped, scooter or motorbike brakes are proven and bombproof if you can get hold of them.
Not everyone has a welder in the shed. Bolted timber frames are totally legitimate, but anything load-bearing — steering, axles, brake mounts — wants to be properly engineered.
If you need a hand with welding, ask around the village — we'll be pulling together a list of local fabricators happy to help builders on race-friendly rates. Got someone to recommend? Let us know.
Full technical regulations will be published once the event is confirmed — these are the non-negotiables.
Find your people
The UK soapbox community is incredibly generous with advice. The Soapbox & Gravity Racing UK Facebook group is full of seasoned builders happy to answer questions on everything from steering geometry to brake setups.
VISIT THE FACEBOOK GROUP →Register your support and we'll keep you in the loop as the event firms up — including when team entries open.
REGISTER YOUR SUPPORT