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

  • 1999
  • Boxster
60 000
Wheels and Tires

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

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