Jump to content

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)

Recommended Posts

  • Admin

Likewise I have them on my 1999 C2...


  • Name: Sumitomo HTR Z III Tires
  • Description: No description provided.
  • Vehicle Owner: Loren
  • Category: Wheels / Tires
  • Date Added: August 13, 2003 - 03:55 PM
  • Date Updated: July 23, 2012 - 09:52 AM
  • Cost Price: $ 925
  • Install Price:$ 0
  • Rating: 10/10
  • Comments: Front: 235/40ZR x 18<br>Rear: 295/30ZR x 18
  • Upvote 1
Link to comment
Share on other sites

I have a new set on my 2002 C4S as well. I replaced the same type after 8,000 miles. They work hard and are a great value. Fronts were 50% but changed all of them for a good match. Blew the rear passenger without any wheel damage due to a pretty solid sidewall.

Could not find the rears anywhere but online.

I will probably buy them again unless something better comes along...


  • Upvote 1
Link to comment
Share on other sites

I have used them on my 99 Boxster. They have been great. I've also the HTR IIs.


I have Michelin Pilot Super Sports on my 2000 911. Once these wear out I am going to HTR IIs or HTR IIIs.


Just my two cents



  • Upvote 1
Link to comment
Share on other sites

After much research, I just bought a set of HTR ZIII for the rears. Research seems to point to them being very "sticky" and  very predictable as to how and when they "break traction".... My only fear is that they look/sound like "squealers" on the videos I have seen. I prefer a tire that is rather quiet when it spins/slides. 

Too early/cold to bring the car out as of yet so have no personal experience with theses to share yet.

If I like ...I shall scrap the yoko fronts and match tires....as is safest.


Price vs reviews= A+... definitely a good tire to be considered.


The only negative I have  so far (and something known to me  going into purchase) is that there is an inside and outside sidewall-  so it is asymmetrical....yet the thread looks but is not considered directional.... the inside thread is cut in a curve....so it kind will look OFF mounted on vehicle.


My last tires were directional but not asymmetrical....so my adjusted negative camber would wear them out inside .....and then to even them out ....I would dismount and mount them on opposing side rims (a labour intensive rotation). Not a possibility with these as the out has to remain out.....so be sure to retain factoty camber.



PS: Loren....noticed you are running much wider tires on a NB C2.... may I ask what width rims, offset (or BS) you are running and if your fenders are stock.

Edited by toolmonkey
  • Upvote 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • 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.