Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

17" rear snow tires to replace 18" regular tires?

Recommended Posts

What you have to maintain is the same diameter front to back. Also it is not the diameter that helps in snow, but the width...the narrower the better. I personally would not run 18 in front and 17 in back.

Agreed - The narrower and the higher the TIRE the better...Total diameters calculations however do not solely justify why you should keep the same wheel diameter for your front and rear wheels...even within the same wheel diameter (see calcs below), you will notice that the total diameter (with tires) changes slightly...Adittionally you might have different wheel diameters but very close total diameters - it is all a matter of the height ratio of the tire you choose. Best advice however, is to keep the same wheel diameter in the front and in the rear because the recommended tire widths (hence the contact surface) are very different across different wheel diameters, which obviously changes the handling of the car. In general, the higher the height ratio of the tires, the higher the 'sidewalls' and the lower the changes of you getting stuck in snow...

Additionally, winter tires and summer tires are made of different materials and tread designs, which have a direct impact on how the car handles.

Just my 2 cents...



Edited by gandrade1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.