What is the diameter of the Tundra axle?

There isn’t one universal diameter for the Toyota Tundra axle. The diameter depends on which axle you mean (front or rear), the model year, and the specific axle design, so you’ll need to identify the exact axle to get a precise number.

In practice, the term “axle diameter” can refer to several different measurements on a Tundra, and those measurements can change across generations and configurations. This article breaks down what people typically mean by diameter, how front and rear axles can differ, and how to determine the exact figure for your truck.

Axle diameter by position

To avoid confusion, it helps to think in terms of two main axle locations on a typical Tundra: the front axle and the rear axle. Each has its own geometry and parts that contribute to the overall diameter figure you might be after.

Front axle

The front axle assembly on modern Tundras can involve a CV-style drive shaft at each wheel or a single front axle housing with the differential, depending on generation and configuration. The diameter most people encounter here is often discussed in terms of the CV half-shaft diameter and the axle tube’s outer diameter surrounding the differential. Because Toyota used different front-end designs over the years, there isn’t a single, fixed number you can rely on without identifying the specific front-axle assembly for your truck.

Before attempting to quote a front-axle diameter, consider these relevant measurements:

• Axle tube outer diameter near the differential housing.


• CV half-shaft outer diameter at the joint closest to the hub.


• Wheel hub bore diameter, which can relate to how the axle interface matches the wheel hub assembly.

In general, the exact figures vary by year, trim, and whether the truck is 4WD or 2WD; consult official specifications for your exact vehicle to determine precise values.

Rear axle

The rear axle on a Tundra is typically a solid housing with a presence of a differential, and the diameter reference is usually the axle tube outer diameter and the housing size around the differential. Like the front, the rear axle diameter is not fixed across all models and years, because Toyota updated rear-axle designs through different generations and drivetrain options.

Common rear-axle diameter considerations include:

• Axle tube outer diameter around the differential housing.


• Axle-shaft diameter for any removable half-shafts or the wheel-side half shafts in certain configurations.

Because of design changes over time, there is no single rear-axle diameter figure you can apply to every Tundra.

How to determine the exact diameter for your Tundra

To obtain an exact diameter value for a specific truck, you should reference official sources or perform precise measurements. The process differs depending on whether you’re looking at the front or rear axle and which generation you own. Here are practical steps to follow.

1. Identify the exact model year, drivetrain (2WD vs 4WD), and whether you’re focusing on the front or rear axle.


2. Consult the Factory Service Manual or Toyota Tech Info for axle-related specifications. If you have access to VIN-specific build data, use it to pull the exact build sheet.


3. Check official Toyota parts diagrams and the OEM parts catalog for axle tube and shaft diameters for your exact assembly.


4. If you must measure, use precision tools: calipers or a micrometer to measure the axle tube’s outer diameter near the differential, and measure the CV/shaft diameter near the joint for the corresponding figure.


5. Compare your measurements with the official specs to verify compatibility for maintenance or parts replacement.

Note: When replacing components or planning upgrades, the precise diameter matters for fitment. If you’re unsure, consult a Toyota-certified technician or a dealership service department for VIN-specific figures.

Where to find official specs

Official sources provide the most reliable axle-diameter figures. Start with these channels to obtain VIN-specific data for your Tundra:

• Toyota’s official tech information portal or dealership access systems (TechInfo/TSI).


• Factory Service Manual and any service bulletins published for your model year.


• OEM parts diagrams and exploded-view illustrations in the Toyota parts catalog.


• Authorized Toyota service centers or your local dealership’s parts department for assistance with VIN-specific specifications.

With the exact VIN or build data, you’ll obtain precise front- and rear-axle diameters applicable to your Tundra.

Summary

The diameter of a Toyota Tundra axle is not a single, universal figure. It varies by axle position (front or rear), generation, and the specific axle design and configuration. To obtain the precise diameter for your truck, consult VIN-specific official manuals or diagrams and, if needed, verify with a Toyota-certified technician or dealer.

How wide is a first gen Tundra rear axle?

If you want to swap this axle into anything though there are some differences you should be aware of first off it's wide the first gen Seoia axle comes in at 69 in wheel mounting surface to wheel

What size is the rear differential on a Toyota Tundra?

10.5" Rear Differential Axle Assembly for Toyota Tundra with 4:30 Gear Ratio.

What is the diameter of a thru axle?

Thru axle diameters are typically 12mm or 15mm, with 12mm being standard for most road, gravel, and newer mountain bikes, and 15mm common for many front mountain bike forks. Mountain bikes may also use 20mm front axles, while 12mm is the standard for most rear axles, including road and gravel bikes.
 
You can watch this video to learn about different thru axle sizes and standards: 59sGMBN TechYouTube · Aug 18, 2018

• 12mm: The most common diameter for both front and rear thru axles on modern road, gravel, and mountain bikes. 
• 15mm: Frequently used for front forks on many mountain bikes. 
• 20mm: Found on some high-performance or downhill mountain bikes for increased stiffness. 

This video explains the different types of thru axles: 58sBikeRumorYouTube · Jun 10, 2020

How wide are Toyota axles?

Stock Front Axle
All of these axles were 55.5 inches wide from wheel mounting surface (WMS) to wheel mounting surface and came with solid front disc brakes and closed knuckles with Birfields. These axles also came with push-pull steering and a torque-rod bracket welded to the housing.