![]() ![]() Unsprung weight is any weight that sits below the suspension. Tires are part of a bike’s unsprung weight. They allow the suspension to be more responsive and react to bumps quicker. Lighter tires make a big difference in motocross. Hoosier is the newest tire brand to enter the motocross market-although they built their name in car racing. The rubber compound is not too hard and not too soft. The knobs are tall enough and spaced out enough to dig into soft dirt, but they aren’t too tall or too spaced out to be ridden on hard-pack dirt. The size and spacing of the knobs are optimized to work well in a variety of conditions. Intermediate tires are designed to be a happy medium between soft- and hard-terrain tires. Hard-track tires have lower knob heights to help increase durability and traction. The rubber compound is also softer, allowing the knobs to flex more. Hard-terrain tires use more knobs in the land-to-sea ratio, which means more rubber is touching the ground and giving the tire more grip on the hard surface. The land-to-sea ratio of hard-terrain tires is the opposite of soft-terrain tires. The stiffer tire digs into the soft dirt and maximizes traction. The rubber used for these tires has a higher durometer count, which is a measure of a material’s hardness. The spaced-out knob pattern on soft-terrain tires keeps the tire from packing up with mud. With this design, the knobs are shaped in more of a scoop or V-shaped pattern, allowing them to go deeper into the ground and grab more dirt with each rotation, propelling the bike forward. A soft-terrain tire is made for sand or mud, and it will have fewer knobs and more sea in the land-to-sea ratio. The Dunlop MX12 has all the obvious features of a soft terrain tire. The newst sand tire is the Dunlop MX14-it has shovel-shaped knobs to scoop the dirt. Tie-bars are also added to connect the bases of the knobs, which adds more rubber and more rigidity to the tire. The slope on the backside of the knobs contributes to the amount of flex the knob has. A stiffer rubber compound will be more durable and will provide less flex, which is good for soft conditions, while a soft compound will flex more and provide more traction on intermediate and hard terrain. The rubber compound, number of knobs, and the size and style of knobs will determine how rigid or soft the tire is. ![]()
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