Supermoto Wheel Conversion Guide: 16-Inch vs 17-Inch Wheels for Sur-Ron & Talaria

A supermoto conversion swaps the narrow knobby off-road wheels on an electric dirt bike for wider wheels with road-compound tyres. The result is a bike that corners harder on sealed surfaces, with a lower centre of gravity and far more grip on asphalt. People convert Sur-Ron and Talaria bikes for track days, kart tracks, car parks used for practice and private sealed roads. This guide explains how 16-inch and 17-inch wheel sets differ, what else changes when you convert, the safety and legal points to check, and when an off-road tyre is still the better choice.

What a Supermoto Conversion Does

A standard electric dirt bike runs a larger front wheel and a narrow knobby tyre designed to bite into soil. A supermoto set replaces both wheels with smaller, wider rims and a slick or street-compound tyre. The contact patch on sealed surfaces grows, the bike sits lower, and the steering becomes sharper. Off-road ability drops, so most owners keep their standard wheels and swap between the two sets.

16-Inch Versus 17-Inch Wheels

A 16-inch rim has less rotating mass and a shorter overall tyre diameter. That makes the bike feel quicker to turn in and accelerate, which suits tight tracks and slow, technical riding. A 17-inch rim gives a much wider choice of road and sports tyres, and typically feels more stable at higher speeds. Neither size is universally better: choose 16-inch for agility and 17-inch for tyre choice and stability. Both need correct fitment for the bike's axle, brake rotor position and mudguard clearance.

Gearing and Speed

Smaller wheels change the effective gear ratio, so a conversion can make the bike feel more eager but also reduce the top speed for a given sprocket. Many riders pair the new wheels with a different rear sprocket to rebalance acceleration and top speed. Bikes with a motor controller that limits speed will not exceed that limit, so changing sprockets mostly affects how quickly the bike accelerates to it.

Brakes and Suspension

Road tyres grip far better than knobbies, so the bike can generate more braking force, and the standard brakes and suspension need to be in perfect order. Check pad thickness, rotor condition, brake fluid and fork seals before you convert. A bike that stops harder also loads the front forks more, and soft factory settings may feel vague on pavement.

Tyre Choice and Care

Pick a tyre designed for the load and speed of your bike, and read the manufacturer's pressure advice. New road tyres often have a mould release coating and need gentle scrubbing in before hard cornering. Cold tyres have less grip, so warm them up for the first few minutes. Do not ride on tyres that are cracked, flat-spotted or past their age limit.

Legal and Safety Points

A converted off-road bike is still an off-road bike. Fitting road tyres does not make it road legal, and an unregistered bike cannot be ridden on public roads. Use closed circuits, private sealed areas and permitted track days. Read our guide to the laws for electric dirt bikes and the e-bike laws overview. Wear a full-face helmet, gloves, boots and a jacket with armour, because falls on pavement are much harsher than on dirt.

Which Bikes Suit a Conversion

The Sur-Ron Light Bee X at 50 kg and the Talaria Sting R MX4 are common choices because of their light weight, power and aftermarket support. If you are looking at a purpose-built road electric bike, a registered model such as the NIU NQi GT may be a better answer than modifying an off-road bike.

When to Keep Knobby Tyres

If your riding is mostly trails, fire roads or mixed terrain, keep the standard wheels. A supermoto set is a second set for sealed surfaces, not a replacement. Compare options in our electric dirt bike range, browse accessories, or ask our team for advice on the contact page. Fitting non-standard parts should be done by a competent mechanic, and you should check how modifications affect your warranty before you start.

Gearing Examples

Changing wheel size changes the effective gear ratio. A smaller overall rolling diameter acts like a lower gear: the bike accelerates harder but reaches the controller's top speed sooner in terms of motor revolutions, and the speedometer reading changes. If you also change the rear sprocket, a larger sprocket gives stronger acceleration and a smaller one gives a longer reach. Make one change at a time, record how the bike feels, and check chain tension and alignment after each change, because a chain that is too tight or too loose wears quickly and can fail.

Brakes and Rotors

Road tyres grip far more than knobbies, so the bike can generate higher braking forces. Check the rotor condition, pad thickness and fluid, and bed in new pads gently. Some conversions need a different caliper bracket or rotor size to fit the new wheel, so confirm compatibility before you buy a wheel set. The Sur-Ron Light Bee X lists hydraulic 4-piston brakes with 203 mm rotors, which is a useful reference point when you plan upgrades.

Suspension Setup

Supermoto riding loads the suspension differently from off-road riding. Forks that were soft for rough trails can dive under hard braking on pavement, and rear shocks may need more preload. Adjust sag and damping in small steps, or ask a suspension specialist to set the bike up for your weight. A properly set-up bike is both faster and safer.

Track Day Preparation

Before a track day, check tyre pressures and condition, brake fluid, chain tension, wheel bearings, steering head bearings and every fastener. Fit tape or covers over exposed connectors if rain is likely, make sure the battery is secure and fully charged, and plan for a cool-down between sessions. Wear a full-face helmet, gloves, boots, a back protector and a suit or jacket and pants with armour. Falls on a sealed surface slide for a long way, and good gear matters.

Cost and Value

A wheel set, tyres, a sprocket, possibly brackets and labour can add up to a significant fraction of a used bike's value, so price the full job before you start. If you want a bike mainly for sealed surfaces, compare the cost against a purpose-built road electric bike. Our electric mopeds and commuter bikes are registered road options, and the accessories range covers many of the parts you may need.

Keeping the Standard Wheels

The best approach for most owners is a second set of wheels. Keep the knobby wheels for the trail and swap to the supermoto set for the track. Label each set, store the tyres out of sunlight, and check the axle torque each time you swap. If you want advice on which Sur-Ron or Talaria suits your plan, ask on the contact page.

A Step-by-Step Fitting Outline

Fitting a supermoto set is a mechanical job that suits a competent home mechanic or a workshop. Support the bike securely, remove the wheel and brake components in the order given in the manual, fit the new wheel with the correct spacers and axle torque, check the rotor alignment, and bed the brakes in carefully. Check chain alignment, spoke or rim fasteners if applicable, and tyre direction arrows before the first ride. Take a short, slow test ride in a safe area, then re-check every fastener. Keep the old wheels clean and stored so you can switch back.

Mistakes to Avoid

Common mistakes include skipping the check of rotor alignment, fitting tyres that are not rated for the speed, riding hard on cold tyres, ignoring the effect on speedometer readings, using the wrong axle spacers and forgetting that suspension settings need to change. Take your time, follow the manufacturer's torque figures, and ask a qualified mechanic if you are unsure. Buying quality wheels and tyres from a reputable supplier is cheaper than repairing a crash.