Forged Wheels: Variant Evo Maxim in Satin Black

[Thraxbert]

This seems correct. When you add +1 inch to the wheel, -10 on the tire profile ends up being the same diameter. 25 sidewall is very thin; the tire selection will be poor; and the ride quality will be pretty uncomfortable. Example: 305/30R19 is same diameter (roughly) as 295/30R20.

I'd just go with the 295 for simplicity. 10mm more contact patch will make no difference in traction. It's all about tire compound at this point.

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[Jmanlevan]

This seems correct. When you add +1 inch to the wheel, -10 on the tire profile ends up being the same diameter. 25 sidewall is very thin; the tire selection will be poor; and the ride quality will be pretty uncomfortable. Example: 305/30R19 is same diameter (roughly) as 295/30R20.

I'd just go with the 295 for simplicity. 10mm more contact patch will make no difference in traction. It's all about tire compound at this point.

Awesome, thanks man, I appreciate the insight!

 

[Jmanlevan]

@Thraxbert Consulting with you again because you helped confirm the tire sizes before in this thread....I just placed an order for another set of wheels from this same company, but this set in 20".

20x10 in the front, 20x11 in the rear. Offset specs should be the same as my 19" set of wheels of +26 in the front, +37 in the rear.

Recommended tire sizes from Mike at Variant are Front: 275/30R20 and Rear: 295/30R20. Does this seem correct? His partner also threw out that I could run a 305/25R20 in the rear? Is that correct? From the little I could gather on my own before reaching out to you, 295/30R20 seems to be common for people with 20" on their Supras. But, I would prefer to have a 305 in the rear for the wider contact patch if I can run it.

okay @Thraxbert I just consulted with Mike based on using the correct tire sizes and I was wrong about the wheel offset being the same as my 19”set for this 20” wheel set.

I guess the new offset specs for these 20x10 and 20x11 wheels using 275/30R20 and 295/30R20 respectively are +28.5 for the front and +32 for the rear. I had assumed the offset sizes would stay the same since the wheel widths of both 19” and 20” are the same at 10” wide in the front and 11” wide in the rear. But he said offset changes based on tire sizes. He pointed me to the website will they fit.com to play with the configurator.

My understanding of wheel offset is based off using the centerline of the wheel. Where the mounting surface is at the center that’s an offset of 0. As that mounting surface moves from the centerline towards the face of the wheel, that’s where you get positive numbers. So +37 is 37mm from the centerline of the wheel closer to the wheel face. Negative numbers move the mounting surface further back giving a more deep dish look. Since both the 19” and 20” set of wheels have widths of 11” I was assuming the offset would stay the same since the wheel widths are the same regardless of wheel diameter and tire size.

I guess I’m just confused why they can’t use +37 in the rear on this 20” set like they did with my 19” set. Are you able to clarify this and educate me more?

For clarity here’s the wheel and tire specs side by side.

Existing 19” set:
19x10 +26 wrapped in 265/35R19
19x11 +37 wrapped in 305/30R19

Future 20” set:
20x10 +28.5 wrapped in 275/30R20
20x11 +32 wrapped in 295/30R20

 

[Thraxbert]

When the offset number goes lower, the edge-of-rim/face of the wheel moves outwards towards the fender. So a +25 offset is 5mm closer to the fender than a +30 offset, for example. I think that's what you were saying, but just want to establish a clear baseline between us to be safe.

In your specific case, using the rear as the comparison point, the 20" option is 5mm more OUTWARDS to the quarter panel/wheel arch than the 19" option.

I don't really agree with the assessment that the offset has to change with a +1" wheel, unless the new wheel/tire size changes diameter or width in such a way that it could interfere with the bodywork. But I'm not a paid professional in this line of business, so I'm not exactly arguing from a position of authority.

The 295 20" solution is actually 10mm taller than the 305 19" option, so if anything, I would move the 20" option inwards 5mm so the top of the tire moves away from the bodywork. That would make it a +42 offset. For example, here's confirmed fitment on 295/30 with 20x11+40.

Conclusion: I don't agree with making the offset lower (wheel outward) on a 20" wheel. Offset in the range of 38-42 should be fine on a 295/30 tire.

 

[Jmanlevan]

When the offset number goes lower, the edge-of-rim/face of the wheel moves outwards towards the fender. So a +25 offset is 5mm closer to the fender than a +30 offset, for example. I think that's what you were saying, but just want to establish a clear baseline between us to be safe.

In your specific case, using the rear as the comparison point, the 20" option is 5mm more OUTWARDS to the quarter panel/wheel arch than the 19" option.

I don't really agree with the assessment that the offset has to change with a +1" wheel, unless the new wheel/tire size changes diameter or width in such a way that it could interfere with the bodywork. But I'm not a paid professional in this line of business, so I'm not exactly arguing from a position of authority.

The 295 20" solution is actually 10mm taller than the 305 19" option, so if anything, I would move the 20" option inwards 5mm so the top of the tire moves away from the bodywork. That would make it a +42 offset. For example, here's confirmed fitment on 295/30 with 20x11+40.

Conclusion: I don't agree with making the offset lower (wheel outward) on a 20" wheel. Offset in the range of 38-42 should be fine on a 295/30 tire.

Gahhh okay! I kinda figured that was the case! But Mike at variant swears this (+28.5/+32) is the correct offset for 20” wheels for this car and looking at the configurator it seems about the same. But my thought was similar to yours, keep it the same as the 19”set or increase it. My 19” set is perfectly flush right now and I don’t want this 20” set to poke so I’ll double/triple check with him.

 

[Jmanlevan]

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