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TPMS sensor compatibility Boxster/Cayman/911

Are the 433mhz tpms sensors same for the 2015 Boxster, 911 and Cayman? 

What are the widest tires that can be mounted on 18" rims for a 2012 Porsche Boxster S?

I'm considering improving the looks and drive on my Porsche Boxster S and wondered if anyone has some recommendation for the widest tires that can fit for front and back.  I think the front has no options but in the rear, it looks like I can add an extra 2" based on my measurements.

Inner tire rub in rear

I am running a K sport suspension system with 17" stock wheels with Yoko AD08R tires. Rear camber is at 2.25 degrees tops in. I would rather go to a wheel spacer that puts the wheels out a bit more than the few mms needed to clear the K Sport spring. Car is lowered, front valence is 6.5" off ground, rear is level with front and rear tire spacing to body. I know, somewhat vague. Sways and Pedro bar are coming already. Primarily an AX car but looking towards DE as well. I am not looking for an absolute max spacer number, just something in the middle.


Thank you,

Spare tire

New to the Porsche world and just bought 2006 Boxster S.   Is there another solution to fixing a flat tier other than the fix a flat that comes with the vehcile.  Are there suitable "donut" tires or spare tires that would fit in the trunk or frunk?  Has anyone actually used the fix a flat with any success?

Tire Pressure 2010 Boxster S 18 inch rims stock

Porsche Boxster S 2010 18 inch rims

Tires 235/40/18 front 265/40/18 rear

The Poresche Manual states tire pressure front 29psi rear 36psi page 278

The door jam sticker reads 30 front 31 rear

all summer settings Who's right

The TPC monitors at 30 front 31 rear

The problem is my previous Boxster S had 265/35/18's on the rear and factory setting was 36psi

Thanks again for your help

Boxster S 986 2003 wheels

Were 8Jx18 and 10Jx18 wheels available as factory installed wheels on a 2003 Boxster S?  I'm having a hard time finding definitive proof.  I autocross with SCCA in C-Street.  SCCA street classes allow a lot of leeway on tires and wheels but the wheel width must be the same as what would have been available from the factory.  I'd like to buy some new lighter weight wheels and want to make sure I don't buy any that don't conform to the rules.

Here is the rule:

Any type wheel may be used provided it complies with the following:

Why does the car ask for the tire diameter and winter vs. summer when resetting TPMS?

When a new set of tires/wheels are installed, it is necessary to go into the car's computer to tell it to re-learn or reset the TPMS sensors.  When going through the menu to do this, it asks what diameter wheel you are using (in my case, 17, 18, or 19 inch) and whether the car has summer or winter tires.  What does the car do with this information?  The overall wheel diameter is very nearly constant regardless of which of these wheel sizes are used (since the tire profile goes up as the wheel diameter goes down).  Do the responses to these questions impact the car's performance in any way? 

Speedometer reading error


  Seems there is a common problem with Porsche (as related to me in casual conversations).  That is the speedometer reading 4-5 mph over the actual speed - as recorded by GPS. Arguments have been wheel size to actually calibrating the speedo.

   Is there a responsible and practical solution to this? 

  FYI: in may particular case, the tires are factory on a Boxster S.


Appreciate the time and attention to this issue!!!


Kurt A. Neumaier
Post Falls, ID


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