Notices

981 Boxster S tire size....35 or 40?

 
Old 03-01-2019, 08:30 PM
  #1  
GT4John
Addict
Rennlist Member
Thread Starter
 
GT4John's Avatar
 
Join Date: Jan 2018
Location: Seattle Area
Posts: 199
Default 981 Boxster S tire size....35 or 40?

So for my wife's new-to-her Boxster S, it's looking like we'll be needing some new tires for the car sooner than later. Right now she's running (all almost dead with one damaged) Goodyear F1 Asymetric at 235 35 20/265 35 20. I'm thinking of giving the Conti Extreme Contact Sports a shot...but that front tire at 235 35 20 is like a rubberband. I see that doing 40 vs 35 all around is an OEM option...but I thought I'd ask you guys to get any feedback you might have. She has the standard suspension...no PASM or X73. She does have Sports Chrono but I forget if that does anything to ride height.

As far as driving behavior...she will be driving the car both on highway and side roads (say...30/70 split) around 200-250 miles per week once the weather gets better. No tracking. And she's not a nut-case on the road, she's a quick, but good driver.

Many thanks for any feedback.

John
GT4John is offline  
Old 03-01-2019, 09:48 PM
  #2  
Scooby921
User
 
Scooby921's Avatar
 
Join Date: Aug 2017
Location: Michigan
Posts: 399
Default

I think the only option on the 20" wheel was the 35 profile. The 40 profile is for a 19" wheel. That doesn't prevent you from doing it. I just don't recall a 40 profile tire being an OE option with the 20" wheels. Presuming you go up from a 35 to a 40 profile front and rear it shouldn't screw with the brake controls (ABS/ESC/TCS), but it's going to throw your speedometer off by a small amount (2.5mph at 70mph). Tire is going to be 1" larger in diameter, so you'll lose 1/2" in clearance to fenders.
Scooby921 is offline  
Old 03-01-2019, 10:35 PM
  #3  
CaymanSinAR
User
 
Join Date: Oct 2017
Posts: 811
Default

Having owned the Contis, Pirellis, and Michelins, get the Michelin PS4S.
CaymanSinAR is offline  
Old 03-01-2019, 10:51 PM
  #4  
storii
Addict
Rennlist Member
 
storii's Avatar
 
Join Date: Oct 2017
Location: Towaco, NJ
Posts: 357
Default

+1 for the Michelin PS4s. Their wet grip has rave reviews (I have no personal experience in this because I don't drive my Boxster in the rain) and it should be a big plus in Seattle.

As for the size, the OE for the 20" wheels is 235/35/20 for the front and 265/35/20 for the rear. The 40 profile will bring up the overall diameter nearly 1" which is well over the commonly accepted 3% tolerance. I would stick with the 35 profile or seek to go down to 19" if you are not comfortable with the 35 profile.
storii is offline  
Old 03-02-2019, 02:56 AM
  #5  
GT4John
Addict
Rennlist Member
Thread Starter
 
GT4John's Avatar
 
Join Date: Jan 2018
Location: Seattle Area
Posts: 199
Default

Thanks guys. I run the PS4S on my GT4 so I'm familiar with the performance. And yeah...amazing. Thanks also for the 35 vs 40 comments. Lamenting those...

My wife's driving is far more -cautious- and between that and this vid:

...the Conti's seem like a darn good option...including in the rain (again...see vid...holy crap).
GT4John is offline  
Old 05-16-2019, 12:54 AM
  #6  
996toomey
Addict
Rennlist Member
 
996toomey's Avatar
 
Join Date: Oct 2004
Location: Stevenson Ranch, CA
Posts: 1,641
Default

Great driving!
996toomey is offline  
 


Thread Tools
Search this Thread

Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: