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Wheels and Tires


HI, I have a 03' Boxster S with 53,000 miles. I bought it new in 2003 and upgraded to 18" carerra wheels. Can I use the original 17" wheel for snow tires without any changes to the setup (offset etc) and just bolt them on.  Thanks in advance for the advice.


I need to replace both my rear tires which are currently OEM 265/40 R19 98Y.

I am being told that I can increase to 275 without any issues. in fact the car may even handle better.

I am currently running on Pirelli P-Zeros and 265 is not currently available in Canada and 275 is also less costly to purchase!

Thank you.


I have a 2005 Boxster S with 18" wheels. Can I upgrade to a 20" Carrera type rim and tire? Any spec to follow:

I would like to upgrade my rims and tires on my 2005 Boxster S from 18" wheels to 20" rims.  Any specs to follow or concerns regarding upgrading to the larger rims from stock 18" rims? 

I want to go from 17 to 18inch wheels. What do I need to know?

Hi Pedro. I have a 99 Boxster Base which is bone stock. I would like to go from 17" ( front 7" wide with 55 offset, rear 8.5" wide with 50 offset) to 18" wheels but am uncertain as to what to be aware of. I understand that I need a lower profile to keep the speedo the same (+3 mph)but what about widths and offsets, etc.? Are there formulae, etc.? I looked at the article on your website but am still uncertain.
Your kind assistance is always most appreciated.

Bart Zwart
904 612-9135

Tire rotation

What milage between tire rotations ?

Will 26" diameter tires

Will a 26" diameter tire (225/45-18 & 265/40-18) tires fit a 2000 Boxster?

2000 Boxster with the optional 18" wheels w/ 265/35's Can I go up to a 265/40 ?

I have Michelin Pilot summer tires on my 2ooo Boxster with optional 18" wheels and 225/40's on the front and 265/35's on the rear.  I noticethe later Boxsters run a higher profile tire.  Can I change the rears from 265/35 to a 265/40 without the ABS going fubar?

986 speedometer sensors & oversize rear tires

In an effort to correct the fact that the speedometer reads about 10% higher than GPS speed, I upsized the rear winter tires for 10% greater circumference.  This did not change the speedometer inaccuracy.  Where is the speedometer sensor that greater tire size wouldn't reduce the speedo reading?

Now, when I get up to about 60 MPH, the sensors for the ABS light the ABS and BRAKE lights on the dash.   Is there any solution other than to go back to a smaller tire?

Warren White


All Season Tires

I'm looking to put a set of all season tires on my 2013 Boxster S. OE Size is 235/40ZR19 Front and 265/40ZR19 Rear. This combination does not exist in AS tires. I'm looking at the Michelin Pilot Sport A/S 3+  or the Continental DWS 06 but the options are 245/40ZR19 front and 275/40ZR19 Rear  or 225/40ZR19 Front and 255/40/19 Rear. The diameter difference is + - .3 inches.

I'm curious to know if anyone has done this and if and weather going up or down in size is preferred. 


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