Quick answer: A Sur-Ron Ultra Bee supermoto conversion swaps the stock 19"/16" knobby wheels for 17" street wheels and sticky tires, transforming the Ultra Bee into a pavement-ready machine. The conversion is a direct bolt-on with no frame or motor modifications required.

The Sur-Ron Ultra Bee is built for dirt. Knobby tires, high ground clearance, and a plush suspension make it a capable off-road machine. But spend five minutes on pavement with those knobbies, and you'll feel every wobble and every squirm under braking.

That's why more Ultra Bee riders are going supermoto. A wheel-and-tire swap turns the same bike into something that carves corners and stops hard on asphalt with no frame cuts and no motor mods.

What Is a Supermoto Conversion?

A supermoto conversion replaces the stock 19" front and 16" rear knobby wheels with 17" street wheels front and rear. Think of it like swapping winter tires for performance tires on your car. It's the same vehicle, but with completely different behavior.

On pavement, the differences show up immediately:

• Lower ride height and a lower center of gravity
• Larger contact patch for grip on asphalt
• Quicker steering and sharper turn-in
• Better braking performance on hard surfaces

Ultra Bee Supermoto Wheel Sizes

The standard supermoto sizing for the Ultra Bee is a 17" x 3.00" front rim and a 17" x 4.25" rear rim. These fitments are compatible with 2023, 2024, 2025, and 2026 Ultra Bee models.

Warp 9 Elite rims with aluminum hubs are a popular choice, available with stainless or powder-coated spokes. For riders focused on reducing rotational weight, titanium spokes save roughly half a pound per wheel compared to stainless, a meaningful difference you'll feel in steering response and acceleration.

Tire Selection for Your Ultra Bee Supermoto Build

Tires do most of the heavy lifting in a supermoto setup. The Michelin Pilot Power 2CT is a strong choice: 110/70ZR17 front and 150/60ZR17 rear. These tires deliver consistent grip across a wide temperature range, similar to how a good set of road bike tires just work whether you're doing a Sunday morning cruise or pushing hard through a tight section.

Custom-built wheel sets arrive mounted, balanced, and ready to bolt on, with inner tubes and rim strips included.

Brake Rotors: Do You Need to Upgrade?

Street riding puts different demands on brakes than dirt. If you're commuting or riding at moderate speeds, the 240mm fixed rotor is a budget-friendly, stock-equivalent option. For most riders, it works fine.

Step up to a 240mm floating rotor for better heat management and improved brake feel. Going bigger—260mm or 300mm floating rotors—gives you maximum stopping power on track or in aggressive riding situations. Both oversized options include the required caliper relocation bracket, so it's still a straightforward install.

Rear rotor options include 240mm fixed or floating, depending on your preference and budget.

Gearing for Street Riding

Switching to 17" wheels changes your effective gearing. The taller wheel diameter raises your final drive ratio slightly, which affects both top speed and acceleration feel.

Sprocket options run from 50T through 60T:

• Lower tooth count = higher top speed, softer acceleration
• Higher tooth count = quicker acceleration off the line, lower top speed

Street riders often drop a tooth or two. Track riders may go the other direction. Use a gearing calculator to dial in the right combo for your riding style before ordering.

Setup Notes Before You Install

A few things to know before the wheels arrive:

• Front fork guards may need trimming or removal to clear the wider street tire. It's a quick job with a utility knife.
• Wheel spacers are included only when needed. Otherwise, reuse your stock spacers.
• Titanium hardware is available as an optional upgrade—half the weight of OEM and corrosion-proof.
• Color matching: powder-coated and anodized finishes will not be identical shades, so keep that in mind if you're mixing options.

Build Time and What to Expect

Ultra Bee supermoto wheel sets are custom built-to-order. Typical build time is 2 to 4 weeks, though specialty finishes or peak seasons can extend that slightly. During the build queue, your order status will show "Awaiting Fulfillment."

Warp 9's repair and replacement policy adds an extra layer of confidence for buyers investing in a custom build.

Frequently Asked Questions

Q: Will supermoto wheels fit my Ultra Bee without modifications?
A: Yes. The wheel set is a direct bolt-on. Front fork guards may need minor trimming to clear the wider front tire, but no frame or motor modification is required.

Q: What size are Ultra Bee supermoto wheels?
A: 17" x 3.00" front and 17" x 4.25" rear.

Q: Do I need a bigger front rotor?
A: Not required. A 240mm fixed rotor works for most street riders. However, 260mm and 300mm floating rotors noticeably improve braking performance on pavement and include the required caliper bracket.

Q: Can I switch back to off-road wheels later?
A: Yes. Many riders own both sets and swap them depending on where they're riding that weekend.

Q: How long does a custom wheel build take?
A: Generally 2 to 4 weeks. Peak season or specialty finishes may add additional time.

Ready to Build Your Ultra Bee Supermoto?

A supermoto conversion is one of the highest-impact upgrades you can make to an Ultra Bee. Same motor, same frame, but a completely different riding experience on pavement. Have questions about sizing, rotor upgrades, or gearing options? Get in touch with the team at Custom Moto Wheels—call or text (855) 800-MOTO, or send a message directly through the site.