Off road tires:

Get valuable info about using larger off road truck tires.

What you should know before adding larger off road tires:

Bigger tires create more ground clearance by raising your 4x4's axles. However, properly fitting larger-than-stock tires often requires changing the truck's suspension and gearing.

Before throwing on 33s or 35s, plan on lifting the truck's suspension or body, and possibly trimming the fenders as well. You might also need to change axle gears to compensate for the fact that larger off road truck tires cause the vehicle to travel farther per revolution.

For safety's sake, consider flotation tires to add a wider stance along with the extra height. This keeps the truck's center of gravity – and handling characteristics –

closer to stock. Always complete the project with a professional alignment. And come to Advance Auto Parts for a complete line of quality auto parts and accessories.

Why you should educate yourself about off road tires:

Many new 4x4s come with passenger-car ("P"-designated) tires, because most new 4x4s spend most of their time on the pavement. Even vehicles that are designated with "LT" (light-truck) tires offer room for growth; an average tire diameter on stock trucks is about 29 inches.

However, many 4x4 owners prefer the stronger look and performance of bigger off road truck tires. Be aware of the impact that increasing off road tire sizes can have on your vehicle’s systems.

What you will need for changing off road tire sizes:

Do-it-yourself difficulty guide for switching off road tires:

Estimated time required -- Varies depending on modifications

How to choose off road tire sizes on your own:

To get an idea of the vehicle modifications necessary to fit various off road tire sizes, talk to your local off road shop or visit a major 4x4 suspension company’s website.

  1. Larger off road truck tires make a truck look more rugged. Functionally, they improve ground clearance by raising the axles, which lifts the rest of the vehicle.
  2. Off road tires within 10% of stock size (usually less than three inches) sometimes fit without major modifications. Slight fender trimming might be necessary to avoid tire rub near full steering lock.
  3. A body lift kit is a cost effective way to accommodate taller tires. Complete kits compensate for steering column length, emergency brake cables and other details.
  4. Suspension lifts clear taller tires and often increase the suspension's range of motion. Experienced do-it-yourselfers can install spring kits, but lifting independent-suspended vehicles is best left to the pros.
  5. To keep your truck from becoming too top-heavy to corner safely, go wider as you go taller. Flotation-style off road tires and wider wheels are the favorite solution.
  6. Fender flares or mud flaps are required for street use when off road truck tires extend too far beyond the truck's body.
  7. Many organized 4x4 runs now require a minimum of 35-inch tall tires. Traction-adding locking axle differentials (lockers) might also be required.


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