Ideally you should be able to touch your toes to the ground when sitting on the seat, but if you can put your feet flat on the ground it often means that your seat height is too low. Hybrid Bike size chart Should your feet touch the ground on a bike? We'd add to that by saying the best way to get a feel for what's comfortable for you is to come test ride a bike! Trek recommends riders go with the largest wheel size they can comfortable handle. If your priorities are agility and playfulness, you might really enjoy a smaller wheel size. If your trail priorities are speed and efficiency, go with a larger wheel size. If you're an advanced rider, you might consider the other listed option and decide which wheel size will suit your riding style best.Īs a rule of thumb, larger wheels have faster top speeds and roll over obstacles easier, while smaller wheels are more maneuverable and 'playful'. If you're a beginner, go with the first option on the suggested wheel size portion of the above chart. It's true that smaller riders often feel more in control on smaller wheels, but depending on your level of experience and the desired ride characteristics, that may or may not be the best way to go for your specific goals. When choosing the wheel size for your next mountain bike, you'll want to take your height and your preferred riding style into account.