When just starting out, deciding on the right size dirt bike sometimes causes more confusion than necessary.
Size of course matters but you need to figure out the two sizes of dirt bikes. The engine size and the actual size. An adult with little knowledge might automatically assume a 450. And that same adult might automatically dismiss a 125.
No one needs a 450 as a beginner. If you have some years under you, experience drives your knowledge of what size dirt bike you need as you A) Age, i.e. get bigger and/or B) Get better, i.e. look to further your skills. Therefore, would love the skilled rider to find much benefit in this article, but truth be told, the primary audience lies in those just starting out trying to navigate their way to the Motocross track or trails.
Choosing the right size dirt bike makes for a safe and enjoyable riding experience by ensuring comfort, control, and confidence. In addition to your height and weight, you also must factor your riding style, terrain and even ergonomics but before you get overwhelmed and run into decision paralysis, first consider the weight of the dirt bike vs your strength (the heavy 250 may overwhelm you) and whether your feet reach the ground when sitting, though keep in mind various applicable adjustments that raise and lower the bike.
Dirt Bike Sizes
Dirt bikes come in a range of engine sizes which often reflect the physical size, but the bigger the engine, some bikes look no different - at least to the novice - from one another. A small 50cc dirt bike clearly gives little kids a run for their money but an adult can ride an 85. However, a 250, 300, 350 and 450 look quite similar but one will buck you right off. Just as you "kick the tires" before considering buying a used car check out the varying physical sizes of dirt bikes at your local dealer to get a sense of the scope and weight along with the engine displacement.
If allowed, sit on various dirt bikes to get a feel for their size, weight and ergonomics. Can you reach the handlebars comfortably and touch the ground while seated? Does a 250 pound dirt bike feel a bit too much? Answers to these questions help determine whether you need a smaller or larger dirt bike in terms of physical size before exploring engine size.
Factors to Consider
1. Rider's Height:
That adult riding an 85? Probably not someone who stands six feet five inches. Conversely, a shorter rider will struggle on a full-size bike and, yes, non full-size bikes exist and something to consider depending on your height and comfort level on a full size dirt bike.
As stated, your feet should touch the ground but if you can firmly plant your feet adjust the bike height or get a bigger bike. It helps to measure your inseam to give you an idea of a comfortable seat height. Wheel size, seat height and suspension adjustments lower or raise the dirt bike, if necessary. Smaller wheels and a lower seat also contribute to better control and handling for those just starting out.
2. Rider's Weight
When it comes to racing pro, every pound counts. Not so much for the weekend warrior riding for fun. However, a heavy rider needs a larger dirt bike in terms of engine size. Rider weight affects overall control and how well a dirt bike traverses hills and other obstacles requiring a boost in power. A nimble ride gives excellent handling and control but an engine too small to carry your weight or one too large for your weight generally results in a poor experience.
3. Riding Style and Terrain
A trail dirt bike differs from a Motocross bike. Keep this in mind when deciding what type of dirt bike riding you plan to invest your time. Off-road and trail riding generally calls for heavy on the torque light on the acceleration while racing Motocross requires fast acceleration. And yes, manufacturers make trail and Motocross specific dirt bikes. Most beginners start with trail dirt bikes.
4. Test Ride if Possible
If the opportunity arises, take a test ride on different dirt bikes to experience their performance and handling firsthand. This will give you a better sense of how each bike feels, power output and whether it suits your riding style and preferences. Pay attention to factors such as acceleration, braking, cornering, and suspension response to determine which bike feels the most comfortable and inspires confidence.
5. Ask Someone Who Knows
We assume a lot but assuming you did not headlong flight into this but instead have a friend or relative who made the initial introduction, ask them. If they can't help certainly they know someone who rides with experience who can offer some advice. You might even get a chance to test ride a bike or two, a request unlikely granted by a dealer.
What Size Dirt Bike Should I Get?
Our advice? Start out small. A beginner adult can't go wrong with a 125 for Motocross or a 150 on the trails. If you want to jump into the deep end without drowning, try a 250 but as stated earlier avoid the 450. If you choose not to hearken, be sure to have the cameras rolling and send in any videos. As for kids, the earlier a youngster starts riding the more natural the progression from a 50cc and upwards as they grow out of small bikes but a tween, depending on their size, probably a 100cc to 110cc dirt bike.
An uncomfortable or harrowing experience quickly throws water on any flame of interest so do your homework, sit on multiple bikes to get a feel and test ride any if possible. If you fall in love with a model that just doesn't feel right but the power falls in line with your expectations, remember you can make adjustments, so instead of you trying to fit on the bike the bike fits with you.
