OneMX™ | PX3S | 140CC | 4 Stroke | Petrol Dirt Bike

Regular price £949
Tax included. Shipping calculated at checkout.

Are you the parent of a teenage dirt bike enthusiast? If that's the case, then look no further than the OneMX™ PX3S OneMoto Teen 140cc Petrol dirt bike!

Not only is it equipped with a reliable and powerful 140cc mini bike engine, but it also features upgraded grippy tires and flexible suspension for maximum fun and excitement.

Your teen will love tearing up the trails on this bad boy, which can reach speeds of between 50km/h and 70km/h depending on the skill of the rider.. Plus, it's suitable for both wet and dry conditions, so there's no need to bring the fun to a halt if it starts raining. And with its reasonably priced price tag, it's a great value for money. 

Make your teenager's dirt bike dreams a reality with the OneMX™ PX3S OneMoto Teen 140cc Petrol dirt bike!

Assembly is required for this quad, and you would also need to apply any stickers upon delivery. RiiRoo also offers a free delivery to the United Kingdom mainland.

Speed & Performance

  • Approx Max Speed: 70 KM/h
  • Transmission: Rear shock: Alloy rear shock
  • Stroke: 4 Stroke
  • Cooling Method: Air cooled
  • Petrol Type: Unleaded
  • Suspension & Brakes

  • Front Brakes: Yes
  • Rear Brakes: Yes
  • Front Shocks: Telescopic Spring-hydraulic
  • Rear Shocks: Coil Spring
  • Brake Type: Disk
  • Dimensions & Weights

  • Box Dimensions: 148 x 66 x 38CM
  • Box Weight: 40KG
  • Product Dimensions: 174 x 74 x 108CM
  • Product Weight: 85KG
  • Height to Seat: 600mm
  • Max User Weight: 70KG
  • Other

  • Start-Up Method: Electric Start
  • Working Lights: No
  • ⚙️ Looking for Spare Parts?

    If you are looking for spare parts for this product Click here

    Delivery to the United Kingdom is on a next day service as long as you order by 1 PM and it is included in the price :)

    Delivery to Northern Ireland is a 2-3 day service; however, this will incur a surcharge :(

    Please Note: Shipping orders and returns outside of the UK will incur a customs fee, so please be sure to factor this in when ordering or returning items.

    Given the varied sizes of the products on offer, we are unable to calculate shipping for you at checkout, therefore please contact our support so they can get a delivery price for you. 

    As an alternative, you can checkout as usual and wait for our customer service team to get in touch with you to provide a quote. 

    We also can ship to most European countries; however, you will need to contact our customer service team for a delivery quote.

    Most of our products will be delivered using a specialised carrier service, and because of this, it is essential you have someone to accept delivery on the scheduled date specified.  A failed delivery will incur additional charges :(.

    Now that we have started selling Petrol dirt bikes, buggies, and quad bikes, we thought it would be a good idea to provide an explanation of the different age ranges that these toys are suitable for.

    Providing a specific age range for these toys is extremely difficult, due to the fact that children come in all different shapes and sizes. Also, what is deemed acceptable to one parent isn’t acceptable to another.

    For that reason, please take this as a rough guideline of the ages these toys are suitable for. It goes without question that the suitability of each product we sell is at the parents discretion. The weight, height and skill level of the person using the toy also needs to be considered.

    We Have 2 Main Categories of Bikes - Dirt Bikes & Pit Bikes

    Pit bikes are generally smaller than dirt bikes in appearance and features. This makes it difficult to choose an appropriate bike since there are so many different varieties of bikes. 

    We ask that you take care when ordering your bike to ensure it is the right weight, height and power and features you are looking for.

    The Pit and Dirt Bikes have a minimum user age of 15+. These are extreme guidelines and will vary depending on the height, weight and skill level of each child.

    We Have 3 Main Categories of Quad Bikes

    There are no maximum ages for these quad bikes. However, OneMoto has a guideline for minimum age use.

    Mini Quads

    These quad bikes are designed for children from the age of 7 and upward. The suitability of each product we sell is at the parents discretion. The mini quads range from 250w to 500w in the electric range and 50cc - 80cc in the petrol range.  We will have more powerful versions under the same category, however, based on customer feedback these should be reserved for much older kids and adults.

    Kids Quads

    These quad bikes are designed for children from the age of 10 and upward. The suitability of each product we sell is at the parents discretion. The child quads range from 500w - 1000w for the electric range and  50cc - 250cc for the petrol range.

    Adult Quads

    There really isn’t a minimum or maximum age for the adult quads, so there was no need for us to set any other guidelines for them other than they are designed specifically for adult use. The adult quad bikes range from 150cc+.

    Buggies & Go Karts

    There are no maximum ages for these buggies and go karts. However, OneMoto has a guideline for minimum age use which is 6+. With this, let us stress that this is purley at a parent’s discretion. Bear in mind that these are pretty powerful machines.

    Customer Reviews

    Based on 4 reviews

    Daughter absolutely loves it

    Hi Benjamin, a huge thank you for your fantastic review! We're delighted to learn that your daughter is enjoying our product so much. It warms our hearts to know that we've contributed to creating happy moments for your family. Your satisfaction is our top priority, and we appreciate your trust in RiiRoo. Thanks for sharing the love!


    Sick bike nice and big bike 17 front and back 14 come

    Dear Haroon,

    Thank you very much for sharing your thoughts with us. We're delighted to hear that you find our bike 'sick' and appreciate its size and the 17-inch front and 14-inch back features. Your feedback means a lot to us, and we're here to assist you with any questions or assistance you may need regarding your bike.


    Bought this awhile ago now
    Didn't have electric start but has a place for the battery inside the bike
    Not very tall
    Good power you can definitely feel the difference compared to a 125cc
    Fairly narrow seat but feels good too ride
    I've put it through some abuse and it still runs fine
    Good bike I'm perfectly happy with it
    I personally would suggest the wpb 125 or 140 just due to the size they are taller and feel bigger if you are a older or bigger person but for a kid this is size is perfect

    Big boy boris

    You should by this amazing bike trust me it’s sick even though I got robbed by Theresa Mai

    Why choose us?

    Because we are One

    OneMoto™ has been years in the making, taking all the learnings from our sister site  Two Sites One Goal: Get Kids & Adults in the OutDoors by Providing Exciting & Enticing Products!


    Couldn't have asked for more.  It got delivered in 2 days and it is exactly what they said it would be! The manual was missing from the box and their support sent it electronically within the hour!

    Maria W

    The choice of products on offer is reason enough to spend hours on their website.  I must have watched at least 30 product videos before I pulled the trigger.  Quick Delivery and a good product.

    Louise Pertonu