How do I configure a Model S for 20" wheels?

[MichaelP90DL]

Today I put on some pretty cool staggered TSW wheels and new rubber. The car noticed a change and told me to configure the new wheels. However I see options for only 19" and 21". Does anyone know a way to configure for 20"?

Thanks in advance.

 

[Aggmeister2010]

I'm fairly certain that configuration is mainly for speedometer accuracy (the Outer Diameter of the 19" tires is different than the 21" tires).

So, depending on your tire size, you just pick with overall OD is closer. If you list your tire sizes I can help.

 

[SSedan]

Believe there are different pressures it accounts for too.

 

[MichaelP90DL]

I'm fairly certain that configuration is mainly for speedometer accuracy (the Outer Diameter of the 19" tires is different than the 21" tires).

So, depending on your tire size, you just pick with overall OD is closer. If you list your tire sizes I can help.

They are:

245/40R20 front
275/35R20 rear

Thx!

 

[Aggmeister2010]

They are:

245/40R20 front
275/35R20 rear

Thx!

Go with the 21" setting.

 

[MichaelP90DL]

Go with the 21" setting.

Cool. Thank you very much!

 

[beatle]

You're actually closer to the 19" diameter:

245/45/19 (stock 19") 729 revs/mile

245/40/20 (your 20" front) 728 revs/mile
275/35/20 (your 20" rear) 732 revs/mile

245/35/21 (stock 21" front) 727 revs/mile
265/35/21 (stock 21" rear) 713 revs/mile

 

[MichaelP90DL]

You're actually closer to the 19" diameter:

245/45/19 (stock 19") 729 revs/mile

245/40/20 (your 20" front) 728 revs/mile
275/35/20 (your 20" rear) 732 revs/mile

245/35/21 (stock 21" front) 727 revs/mile
265/35/21 (stock 21" rear) 713 revs/mile

Thank you. Can you tell me on which wheel(s) the speed measurement occurs?

 

[beatle]

Probably best for you to do your own experiment with a GPS and the 19" and 21" wheel setting.

 

[Wei Li]

應用驗證結果如下：
ET值=鋁圈圈-1mm
J數+1=鋁圈寬度+25.4mm
但是以除2同樣要外移的mm
所以同樣ET值=>鋁圈+1J=外移12.7mm
鋁圈+0.5J=外移6.35mm
鋁圈+0.1J=外移1.27mm

（輪J值，指輪圈的寬度，也是耳圈內圈到外耳圈的距離，單位是英吋，所以1J=25.4mm）

前:ET30 (原40) =>外移ET40-30=10mm
後:ET30(原40) =>外移ET40-30=10mm-(0.5Jx6.35mm)=3.65mm

8.5J
(21原8.5 9J)
(19原8J)
四輪都用245/40r20
稍後確認 255/40/20 更好的選擇

 

[Str8down]

You're actually closer to the 19" diameter:

245/45/19 (stock 19") 729 revs/mile

245/40/20 (your 20" front) 728 revs/mile
275/35/20 (your 20" rear) 732 revs/mile

245/35/21 (stock 21" front) 727 revs/mile
265/35/21 (stock 21" rear) 713 revs/mile

He has a refreshed S. Those are not the stock tire sizes for his car.