4.4 differential broke . ? from staggered rims

[Roman D]

well, I guess you know better. There is always a possibility that it was simply time for that differential to become broken
But I am having hard time accepting that 275/40 has the same diameter as 315/35.
The length of the circle is 2PiR
Where We have 275x40, 40mm (4 centimeters) height of the tire which we will add to the diameter of a rim on both sides.... 4+50.8(diameter of the rim)+4= 58.8, where radius would be precisely half, 2 x 3.14 x 29.4 = 184.73
Where we have 315x35... (3.5 centimeters)
3.5+50.8+3.5=181.58

According to that wheel with tire that has a wall height of 40mm will have 184.73cm outer length and the one with 35mm wall height will have 181.58 cm outer length which is not the same.
Am I overthinking the situation?

[X53Jay4.8is]

Originally Posted by Roman D

well, I guess you know better. There is always a possibility that it was simply time for that differential to become broken
But I am having hard time accepting that 275/40 has the same diameter as 315/35.
The length of the circle is 2PiR
Where We have 275x40, 40mm (4 centimeters) height of the tire which we will add to the diameter of a rim on both sides.... 4+50.8(diameter of the rim)+4= 58.8, where radius would be precisely half, 2 x 3.14 x 29.4 = 184.73
Where we have 315x35... (3.5 centimeters)
3.5+50.8+3.5=181.58

According to that wheel with tire that has a wall height of 40mm will have 184.73cm outer length and the one with 35mm wall height will have 181.58 cm outer length which is not the same.
Am I overthinking the situation?

Your mis reading aspect ratio

[upallnight]

Originally Posted by X53Jay4.8is

Your mis reading aspect ratio

Sidewall Aspect Ratio
Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.

P225/50R16 91S

The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall.

[Gurjit]

Originally Posted by Roman D

well, I guess you know better. There is always a possibility that it was simply time for that differential to become broken
But I am having hard time accepting that 275/40 has the same diameter as 315/35.
The length of the circle is 2PiR
Where We have 275x40, 40mm (4 centimeters) height of the tire which we will add to the diameter of a rim on both sides.... 4+50.8(diameter of the rim)+4= 58.8, where radius would be precisely half, 2 x 3.14 x 29.4 = 184.73
Where we have 315x35... (3.5 centimeters)
3.5+50.8+3.5=181.58

According to that wheel with tire that has a wall height of 40mm will have 184.73cm outer length and the one with 35mm wall height will have 181.58 cm outer length which is not the same.
Am I overthinking the situation?

you are over thinking it
willitfit.com

275/40/20 315/35/20 has been my tire size for almost 200,000kms
this is factory
ther is a built in tolerance
check out the tire size for the x6s and new x5s with 21' rims

checkout Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit

[Joshdub]

Originally Posted by Gurjit

you are over thinking it
willitfit.com

275/40/20 315/35/20 has been my tire size for almost 200,000kms
this is factory
ther is a built in tolerance
check out the tire size for the x6s and new x5s with 21' rims

checkout Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit

He isn't over thinking anything, just miscalculating one of the pieces. There aren't so much built in tolerances, but rather those two sizes have nearly the exact same rolling diameter.