Planet-9 Porsche Forum banner
  • Hello Everyone! Let us know what you would spend a $50 Amazon gift card on, HERE For a chance to win a $50 Amazon Gift Card!
1 - 1 of 1 Posts

·
Registered
Joined
·
148 Posts
Discussion Starter · #1 ·
(Posting here since there is no dedicated 718 subforum beyond the general one)

The 718 has been out for nearly a year, yet there is almost no info regarding which aftermarket wheel sizes will work. Tire Rack doesn't even have the 718 in its database yet.

So to start a database, I've compiled all of the wheel options available for the 2018 718 below. All four models have the same choices from 19" upward; the 2.0l Cayman and Boxster have the 18" choices, which likely indicates that they won't work with the 911 Turbo brakes that are on the "S" models:

18" Boxster IV (alloy): 8x18 ET 57 with 235/45 ZR 18 tires (front); 9.5x18 ET 49 with 265/45 ZR 18 tires (rear)
18" Cayman III (alloy): 8x18 ET 57 with 235/45 ZR 18 tires (front); 9.5x18 ET 49 with 265/45 ZR 18 tires (rear)
19" Boxster S IV (flow-formed): 8x19 ET 57 with 235/40 ZR 19 tires (front); 10x19 ET 45 with 265/40 ZR 19 tires (rear)
19" Cayman S IV (flow-formed): 8x19 ET 57 with 235/40 ZR 19 tires (front); 10x19 ET 45 with 265/40 ZR 19 tires (rear)
20" Carrera S IV (alloy): 8x20 ET 57 with 235/35 ZR 20 tires (front); 10x20 ET 45 with 265/35 ZR 20 tires (rear)
20" Carrera Classic II (alloy, two-tone): 8x20 ET 57 with 235/35 ZR 20 tires (front); 10x20 ET 45 with 265/35 ZR 20 tires (rear)
20" 911 Turbo IV (forged, two-tone): 8.5x20 ET 57 with 235/35 ZR 20 tires (front); 10.5x20 ET 47 with 265/35 ZR 20 tires (rear)
20" Carrera Sport (alloy, painted/machined): 8.5x20 ET 57 with 235/35 ZR 20 tires (front); 10.5x20 ET 47 with 265/35 ZR 20 tires (rear)

Some notes:
- All front wheels have an ET57 offset, even though the last two options are .5" wider. This suggests that 8"-wide front wheels can have an ET as low as 51 and as high as 62 without clearance issues.
- Rear wheels vary a full inch in width between 9.5" and 10.5". What's interesting is that the offset goes down 4mm, then back up 2mm, as the wheels get wider. This suggests that there is at least 10mm of leeway (!!!) on either side of the rim with the 18x9.5s fitted. So:

18x9.5 rears can have an ET as low as 39 or as high as 59
19x10 and 20x10 rears can have an ET as low as 39 or as high as 51
20x10.5 rears can have an ET as low as 39 or as high as 55

without clearance issues.

Someone check my math, please, but I'm fairly certain these guidelines are solid.
 
  • Like
Reactions: Kathy M and gearFX
1 - 1 of 1 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top