RAM TRX Wheels on a 2024 1958 Landcruiser?

[Wakesurfboy]

Hi,

My stock 2024 1958 is equip with 18” x 7” 6x139.7 bolt pattern with +70 mm offset and tires are 245mm. The suspension arm is already pretty close to the tire so upgrading to larger tires need of course the wheel to go outside of the car.

I wonder if I can fit a RAM TRX wheels in a 2024 Landcruiser? Spec for TRX wheels are 18” x9", 6x139.7 bolt pattern with +19 offset, Tires are 325mm

So If I put tires with 80mm larger (325mm - 245mm = 80mm), that means the tire will go 40mm closer to the suspension so the Offset need to be 40mm less right?
70mm - 40mm = 30mm. The TRX offset is 19mm so I will have 11mm more space to the suspension right?

It’s the first time I compute numbers for wheels and tires so tell me if my calculation is ok or if I’m wrong.

Can TRX wheels and tires fit?

 

[Roonie]

funny I almost test fitted mine onto my older landcruiser to see if they fit for fun but decided not to go through the hassle. Traded in my Ram for the new cruiser.

 

[uraniumrich]

Hi,

My stock 2024 1958 is equip with 18” x 7” 6x139.7 bolt pattern with +70 mm offset and tires are 245mm. The suspension arm is already pretty close to the tire so upgrading to larger tires need of course the wheel to go outside of the car.

I wonder if I can fit a RAM TRX wheels in a 2024 Landcruiser? Spec for TRX wheels are 18” x9", 6x139.7 bolt pattern with +19 offset, Tires are 325mm

So If I put tires with 80mm larger (325mm - 245mm = 80mm), that means the tire will go 40mm closer to the suspension so the Offset need to be 40mm less right?
70mm - 40mm = 30mm. The TRX offset is 19mm so I will have 11mm more space to the suspension right?

It’s the first time I compute numbers for wheels and tires so tell me if my calculation is ok or if I’m wrong.

Can TRX wheels and tires fit?

The difference in wheel width also changes the offset because the offset is calculated as the distance from the center of the wheel. Since the RAM TRX wheel is 9" wide and the 1958 wheel is 7" wide, the calculations to compare the rims must include the rim width. The easiest thing to do is to use a wheel offset calculator to check the difference between the two wheels.

The equation for difference in poke is:

(width of new wheel - width of old wheel)/2*25.4 + (offset of old wheel - offset of new wheel)=change in poke

For your wheel: (9-7)/2*25.4 + (70-19) = 76.4 mm (about 3" more poke!)

The equation for changes in distance to suspension is similar:

(width of new wheel - width of old wheel)/2*25.4 + (offset of new wheel - offset of old wheel)=change in distance to suspension

For your wheel: (9-7)/2*25.4) + (19-70) = -25.6 mm (in other words, you'll be about 1" further away from the suspension)

I've detailed these calculations elsewhere in the Forum. Here is the text from that post:

The pic below shows calculations to determine how the offset and rim width change the overall position of the wheel relative to the suspension (for a 285/70R17 +35 on 8.5" width rim). The additional poke is 37.7 mm (or 1.48") when compared to the stock 20" wheel. So, the new tire will still be under the fender. The only thing that changes if I go to the 285/75R17 is the overall diameter of the wheel.

If I would've chosen the Method 708 (+40 offset, 9" wide rim), the actual poke would be 39.1 mm which is more than I'd see with the +35 offset/8.5" rim on the 703s. The calculated values are shown in the second picture.

Here is a link to the offset calculator and wheel comparison: Alloy Wheel & Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit

Here is the formula to calculate the difference in Poke (width of wheel in inches, offset in mm):

(width of new wheel - width of old wheel)/2*25.4 + (offset of old wheel - offset of new wheel)=change in poke

For the 703:
(8.5-7.5)/2*25.4 + (60-35) = +37.7 mm (1.48") additional poke

For the 708:
(9.0-7.5)/2*25.4 + (60-40) = +39.05 mm (1.54") additional poke