Off-Road Tire Size Guide: Choosing the Right Tires for Your Build
Choosing the right tire size is one of the most important decisions in any off-road build. Go too small and you leave capability on the table. Go too big without proper supporting modifications, and you end up with a rig that’s sluggish, unreliable, and expensive to fix. At Godspeed Off-Road in Sarasota, we’ve helped hundreds of truck and SUV owners find their perfect tire size — and we’ve built the supporting packages to make every setup perform at its best.
This guide breaks down the four most common off-road tire sizes, what each one requires, and which vehicles they work best on. Use it as a starting point, then call us to discuss the specifics of your build.
31-Inch Tires — The Entry Point
31-inch tires are the gateway to off-road upgrades. For most trucks and SUVs, 31s fit with a simple leveling kit or sometimes no lift at all. Regearing is typically not necessary, and the impact on fuel economy and daily drivability is minimal. This is the right choice for drivers who want improved looks, moderate ground clearance gains, and light trail capability without a significant investment in supporting modifications.
Typical lift needed: 0 to 2 inches
Regearing: Not typically required
Best for: Daily drivers, light trail use, first-time builds
Read our complete 31-inch tire guide
33-Inch Tires — The Sweet Spot for Many Builds
33-inch tires are where the off-road transformation starts to get real. You’ll see a significant improvement in ground clearance, approach and departure angles, and visual presence. Most vehicles need a 2 to 3-inch lift, and regearing to 4.56 is recommended to maintain proper drivetrain performance. This is the most popular tire size we install for daily-driven rigs that see regular trail use.
Typical lift needed: 2 to 3 inches
Recommended gear ratio: 4.56
Best for: Trail-capable daily drivers, weekend warriors
Read our complete 33-inch tire guide
Popular 33″ Vehicle Builds
35-Inch Tires — The Most Popular Upgrade
35-inch tires are the most requested tire size at Godspeed Off-Road — and for good reason. This is the size where you get a dramatic visual and performance transformation while still maintaining practical daily drivability. Most vehicles need a 3 to 4-inch lift, aftermarket upper control arms (on IFS vehicles), and regearing to 4.88 is essential. The investment is larger than a 33-inch build, but the result is a rig that turns heads and handles serious trails.
Typical lift needed: 3 to 4 inches
Recommended gear ratio: 4.88
Best for: Serious trail rigs, overlanding builds, show trucks
Read our complete 35-inch tire guide
Popular 35″ Vehicle Builds
37-Inch Tires — Serious Build Territory
At 37 inches, you’re entering the realm of dedicated off-road builds. This tire size requires careful planning, quality components, and professional installation. Most vehicles need 4 to 6 inches of lift (or more), regearing to 5.13, brake upgrades, and several supporting modifications. The result is a rig with exceptional off-road capability that commands respect on any trail. Daily driving is still possible, but fuel economy and ride character change significantly.
Typical lift needed: 4 to 6 inches
Recommended gear ratio: 5.13
Best for: Dedicated trail rigs, rock crawling, extreme off-road
Read our complete 37-inch tire guide
Popular 37″ Vehicle Builds
40-Inch Tires — The Ultimate Build
40-inch tires are the pinnacle of off-road vehicle modification. This is a full-commitment build requiring extensive modifications to every major system — suspension, axles, steering, brakes, drivetrain, and body. Regearing to 5.38 or higher is mandatory. Very few platforms can support 40-inch tires, with the Jeep Wrangler being the most common choice. This build is for serious enthusiasts who want maximum capability and are prepared for the investment it requires.
Typical lift needed: 6 to 8+ inches
Recommended gear ratio: 5.38+
Best for: Competition rigs, extreme rock crawling, dedicated trail vehicles
Read our complete 40-inch tire guide | Wrangler 40″ Build Guide
Gear Ratio Quick Reference
Regearing is critical for maintaining performance, fuel economy, and drivetrain longevity after a tire upgrade. Here’s a quick reference:
- 31″ tires: Stock gears (no regear typically needed)
- 33″ tires: 4.56 gears
- 35″ tires: 4.88 gears
- 37″ tires: 5.13 gears
- 40″ tires: 5.38+ gears
Read our complete regearing guide for a deep dive into why gear ratios matter and what’s involved in the process.
Frequently Asked Questions
What tire size should I choose for my first off-road build?
For most first-time builders, we recommend 33-inch tires. They deliver a meaningful visual and performance upgrade while keeping the investment and complexity manageable. You can always go bigger later — and if you plan ahead with the right gear ratio and lift, upgrading from 33s to 35s down the road is straightforward.
Do bigger tires always mean better off-road performance?
Not necessarily. Bigger tires provide more ground clearance and larger contact patches, but they also add weight, reduce acceleration, and require more supporting modifications. A well-built 33-inch rig can outperform a poorly built 37-inch rig on the trail. The key is matching your tire size to your vehicle’s supporting components — lift, gears, brakes, and steering all need to work together as a system.
Can I run bigger tires without a lift?
In some cases, a small upgrade (like going from stock to 31-inch tires) can work without a lift. For anything 33 inches and above, a lift is required. Running oversized tires without proper clearance causes rubbing, premature tire wear, suspension damage, and potential safety issues. We always recommend proper fitment.
How does tire size affect towing capacity?
Larger tires reduce your effective gear ratio, which decreases towing performance. This is why regearing is so important — it restores the mechanical advantage your drivetrain needs to handle loads. After a proper regear, most vehicles recover their factory towing characteristics. However, the increased vehicle height from a lift can affect trailer tongue weight dynamics, so we recommend discussing towing needs before planning your build.
Let Godspeed Off-Road Build Your Rig
No matter what tire size you’re considering, Godspeed Off-Road has the experience and expertise to build your truck or SUV the right way. We handle everything from initial consultation through final alignment and trail testing — so you drive away with confidence.
Call us at (941) 706-0071 or stop by 2858 Clark Road, Sarasota, FL 34231.