Changing Wheel and Tire sizes...

[Westcoaster]

Do I need to worry about going from stock sized 17" wheels and tires to larger stock spec wheels and tires?

Will there be codes or errors, is this set into the OBC when the car is made?

I have a 2006 Boxster and was looking at 18" and 19" sets to replace my 17" wheels and tires

[gandrade1]

Do I need to worry about going from stock sized 17" wheels and tires to larger stock spec wheels and tires?

Will there be codes or errors, is this set into the OBC when the car is made?

I have a 2006 Boxster and was looking at 18" and 19" sets to replace my 17" wheels and tires

Hi Westcoaster,

As long as you go for 18's or 19's that meet the specs that are recommended for your car (look for a TSB on Summer Tires and Wheels) you should have no problems at all. I am not 100% sure, but I believe that even if the 18/19s don't meet the Porsche specs exactly you will not have any code errors, probably some minor discrepancies on your speed readings but no codes...

Best,

Gus

[Westcoaster]

That sounds a little more encouraging, so can I get away with these?

Porsche 19 inches wheels and tires. Front = 235/35 ZR19 8x19" (57 mm offset), Rear = 305/30 ZR 19 11x19" (51 mm offset). 19" Carrera wheels...?

[gandrade1]

That sounds a little more encouraging, so can I get away with these?

Porsche 19 inches wheels and tires. Front = 235/35 ZR19 8x19" (57 mm offset), Rear = 305/30 ZR 19 11x19" (51 mm offset). 19" Carrera wheels...?

Hi Westcoaster,

I ran some numbers and it looks like the rear wheels will move slightly towards the suspension by 22 milimeters (2 centimeters), while the outside movement is almost negligible. Note that you could add some spacers to balance out the movement towards the inner side of the car. I don't think you would have a problem.

That being said, I would call a store that is used to Pcars and ask them just to make sure. Or hopefully someone with a 987 has done the same thing and will give their advice.

All the best,

Gus

Edited August 11, 2008 by gandrade1

[Westcoaster]

That sounds a little more encouraging, so can I get away with these?

Porsche 19 inches wheels and tires. Front = 235/35 ZR19 8x19" (57 mm offset), Rear = 305/30 ZR 19 11x19" (51 mm offset). 19" Carrera wheels...?

Hi Westcoaster,

I ran some numbers and it looks like the rear wheels will move slightly towards the suspension by 22 milimeters (2 centimeters), while the outside movement is almost negligible. Note that you could add some spacers to balance out the movement towards the inner side of the car. I don't think you would have a problem.

That being said, I would call a store that is used to Pcars and ask them just to make sure. Or hopefully someone with a 987 has done the same thing and will give their advice.

All the best,

Gus

Hi Gus, thanks for the chart, took me a few minuts but I see what you have done now.

I found that the front wheel of 8Jx19, RO 57 is a standard size for the Boxster Cayman, but as your chart shows the rear wheel is wider and has a different offset then that largest stock wheel: 10Jx19, RO42

So far no other 987 owners have chimed in, and since this set of tires/wheels are not local I can't try/fit before I buy...

Al