Mountain Bikes

99 Bikes carries a range of mountain bike styles including hardtails, dual suspension, trail, cross-country, dirt jumper, enduro and downhill bikes. Each type is designed for a different riding style or terrain, so the right choice depends on where and how you plan to ride.

A hardtail mountain bike has front suspension only, making it lighter, more affordable, and well suited to beginners, cross-country riding, and mixed-use trails. A dual suspension bike adds rear suspension as well, which absorbs more impact on rough or technical terrain and gives you greater control on challenging descents.

A hardtail bike is generally the best starting point for beginner riders. It offers a simpler setup, lower price point, and is well suited to light trails, gravel paths, and general off-road use while you build confidence and skills.

Yes, many mountain bikes are versatile enough to handle both commuting and recreational trail riding. Hardtails in particular are a popular choice for riders who want one bike that works across mixed surfaces, from sealed roads and bike paths to gravel and dirt trails. Just be aware that a dedicated commuter bike will often have more mounting points for accessories like pannier bags if you need to transport gear around that won't fit in a backpack.

Dirt jumper bikes are purpose-built for jumps, skate parks, and trick riding. They have a strong, compact frame and are designed for riders focused on park-style riding rather than trail or cross-country use.

Finding the right frame size online starts with measuring your height and inseam (inside leg), then matching these to the specific bike’s size chart, as sizing can vary between brands; your height helps determine a general size (e.g. Small, Medium, Large), while your inseam ensures proper standover clearance and overall fit, so you can ride comfortably with a slight bend in your knee and an easy reach to the handlebars. If you’re between sizes, a smaller frame offers a more upright, comfortable ride, while a larger frame gives a slightly more stretched-out feel. To make this easier, 99 Bikes provides an online size tool that uses your height and inseam measurements to recommend the most suitable frame size for each bike, helping you choose confidently when buying online.

Finding the right bike size can feel tricky, as different bike types have slightly different geometries. To make it easier, we’ve created a Find Your Size tool. Simply enter your height and inseam measurements (or those of the person you’re shopping for), and we’ll recommend the best size for each bike and pre-select the recommended option for you.

Not sure of your inseam measurement? No worries! We provide an estimated inseam measurement based on your height to help keep your recommendation as accurate as possible.

You can find the tool on each product page or at the top of categories when browsing. Try Find Your Size.