Parts/Complete vehicles & kits/Ready-to-run (RTR)/Losi Promoto-SM FXR Supermoto RTR 1/4 Brushless Motorcycle (White/FRX) w/2.4GHz Radio, Battery & Charger
Losi Promoto-SM FXR Supermoto RTR 1/4 Brushless Motorcycle (White/FRX) w/2.4GHz Radio, Battery & Charger
Losi

Losi Promoto-SM FXR Supermoto RTR 1/4 Brushless Motorcycle (White/FRX) w/2.4GHz Radio, Battery & Charger

Part # LOS-23105.0(7)
Where to buy
$599.99
AMain Hobbies
Seen Oct 12, 2026
$599.99Buy
Prices are as last seen at the store; stock is not tracked.

About this part

Losi-Promoto FXR Banner Photo

Realistic R/C Supermoto Experience

The Losi Promoto-SM Ready to Run 1/4 Brushless Supermoto has been designed to tear up the streets. This Supermoto comes out of the box equipped with Pro-Line Racing OE Supermoto Street Tires. Built on the Promoto-MX platform with a ton of updates, the Promoto-SM gives users the most authentic supermoto experience an RC bike can offer.

About the RTR Promoto-SM

Team Losi Promoto-SM Suspension

Updated Suspension and Brakes

The front brake has received major updates with a redesigned caliper and floating piston to apply pressure to a larger surface area. The lean bars have also been updated and are mounted on a bearing allowing for better traction on hard surfaces. The Promoto platform is a fluid-filled friction chamber between the upper and lower head tube bearings. The chamber is filled with heavy 500,000cSt which dampens the servo saver well and helps to control any possible "head shake.”

Team Losi Promoto-SM Wheelie Photo

Three Driving Modes

The included DX3PM transmitter comes from the factory with three distinct modes. Using the toggle on the side of the transmitter, you can change between Dirt Mode, Street Mode, and Wheelie Control. Dirt Mode gives the bike enough power to rip around and ride the back tire without "Wheelie-Overs". Street Mode senses when the bike starts to pitch up and clips the throttle quickly ensuring maximum acceleration. Wheelie Control Mode lets you Braap it up by keeping the front tire off the ground for as long as you want.

Team Losi Promoto-SM Electronics

Electronics

To give the bike a real gyroscopic feel, a motor is placed at the bottom of the chassis spinning a flywheel at over 22,000 RPM. The driving motor is a Spektrum Firma 3652 3800kV 4-Pole Brushless Motor powered by a Spektrum Firma 85A Brushless Smart Motorcycle ESC. Slap your battery in this Supermoto and get out and braap it up!

Features:

  • Updated cable-driven front disc brake
  • Frame-integrated, high-RPM flywheel
  • Chain drive with dual disc performance slipper clutch
  • Officially licensed FXR graphics and rider gear
  • Pro-Line OE Supermoto Tires
  • Three drive modes Dirt, Street, and Wheelie mode
  • Collapsible front crash structure
  • Patent-pending Spektrum MS6X technology
  • Updated lean bars for maximum traction

Includes:

  • (1) Losi Promoto-SM 1/4 Supermoto Motorcycle RTR FXR
  • (1) 2S Spektrum 7.4V 5000mAh LiPo with IC5 Connector
  • (1) Spektrum Smart S120 USB-C Charger
  • (1) IC5 Device to IC3 Battery Adapter
  • (1) Spektrum Smart DX3PM Transmitter
  • (4) AA Transmitter Batteries
  • (1) Bike Stand
  • (1) Starting Stand
  • (1) Product Manual
  • (1) Quick Start Guide
  • (1) Chain Lube
  • Tuning Parts
  • Fork and Shock Tools

Needed to Complete:

  • Nothing! Everything you need is in the box!

Specifications:

Scale 1:4
Drive 1WD
Power Source 2S LiPo
Length 19.8in (503mm)
Wheelbase 13.9in (353mm)
Width 10.2in (259mm)
Height 16.7in (424mm)
Weight 8.08bs (3540g)
Electronics
Motor: Brushless - Sensorless
ESC Brushless - Sensorless
Connector IC5
Servo Standard
Wheels
Front 1.1in (28mm)
Rear 1.4in (36.3mm)
Tires
Front Pro-Line Supermoto S3
Rear Pro-Line Supermoto S3
Assembly Level RTR

*Tech Note: Ready-to-Run models come equipped with all electronics and include the transmitter needed for use. Please check the "Needed To Complete" above to make sure you have everything you need to get out and enjoy your RC model.
NOTE: Full list of maintenance videos found here.

Manuals:

User Manual

Parts Diagram

CA Residents Prop 65 Warning WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov Details...

Reviews5.0 · 7 reviews

J.T.on Losi Promoto-SM FXR Supermoto RTR 1/4 Brushless Motorcycle (White/FRX)

This thing is awesome… took it out with 3 batteries fully charged for the first run… came back charged the 3 up and did it again!!! Crazy fun!!

2 found this helpful
George IrwinVerified owneron Losi Promoto-SM FXR Supermoto RTR 1/4 Brushless Motorcycle (White/FRX)

An absolute blast to drive! It will cover some real estate real quick so give it plenty of space. Might I suggest you start on 50% speed until you get the hang of it. Not going to lie and say it’s easy at first, just a learning curve. It’s not like driving a four wheeled vehicle. I took mine to a local concrete hockey rink. The smooth surface was very forgiving when it made contact.

2 found this helpful
ScottVerified owneron Losi Promoto-SM FXR Supermoto RTR 1/4 Brushless Motorcycle (White/FRX)

TEAM AMAIN! FUCK YEAH!! Received an email around 10-11 o’clock the other night.. only had a few minutes to take the deal, and I scored a ProMoto SM for $399!! Thanks Amain!

1 found this helpful
AnonymousVerified owneron Losi Promoto-SM FXR Supermoto RTR 1/4 Brushless Motorcycle (White/FRX)

I ran mine for the first time today and it was a LOT of fun! The parking lot I was going to use still had cars in it so I had to use a narrow side road behind the building and, even with the cramped riding spot, I was able to learn how to control it decently after one battery. I also bought a set of wheels & dirt tires for MX riding and two extra batteries. It came with a USB charger, but I bought a Spektrum S1100 charger to replace it, and I also installed the Pro-Line Enduro Light Kit on it. This thing lives up to the hype, and I foresee a bunch of fun times with this r/c motorcycle. And I love that there are so many upgrades available for it.

1 found this helpful
Thomas FrederiksenVerified owneron Losi Promoto-SM FXR Supermoto RTR 1/4 Brushless Motorcycle (White/FRX)

Another fantastic Losi product to add to the collection!! Super fast shipping and everything was absolutely perfect when I opened it up. Highly highly recommend Amaingobbies and will continue to purchase from again in the near future!!!

What reviewers say

All seven reviews are five-star ratings for the Losi Promoto-SM FXR Supermoto RTR in the white/FRX variant, and reviewers consistently describe it as very fun to drive. Several note a learning curve at first, with one suggesting starting at half speed and giving it ample space because it covers ground quickly. Reviewers report it handles well on asphalt, pavement and a hockey rink, with wheelie mode and dirt tires mentioned for off-road use. Multiple owners recommend buying extra batteries, as one battery provides limited run time. Some reviews also mention the included USB charger being replaced by an aftermarket charger, and fast shipping from the seller. Reviews are mostly enthusiastic and do not describe significant defects.

  • + Very fun to drive
  • + Stable and easy to control once learned
  • + Handles well on smooth surfaces
  • + Strong upgrade and accessory support
  • − Learning curve for new drivers
  • − Needs a lot of space and covers ground quickly
  • − One battery is not enough
  • − Included USB charger replaced by owners
Summary generated from the reviews above.

Builds using this part

No builds use this part yet — add it to yours from the build editor.