I have had the same problem as you describe with your Dimension IV's. The difference is that I have had this problem with both the Arriva's and the Firestone 721's that I still have on some of my cars as well as the Dimension IV's. I am not sure what causes it, but after the car has been sitting for a while, the white wall turns brownish and starts from the outside edge and works its way inward. On the Dimension IV's I have been able to clean it off with Brillo Pads and Wesley's Whitewall cleaner. The others have taken more effort. One of the Arriva's on my '65 Crown has never been very white again, but that may be because the car sits around a lot, and I don't wash the tires as often as some of the cars that I drive regularly. Bottom line, if you clean them before the discoloration is there for too long, they will clean up like new. It seems that the condition may become permanent if it remains that way for a long period. I really don't know what causes it, but it is not unique to Dimension IV tires. Paul In a message dated 12/20/2003 1:11:30 PM Eastern Standard Time, tomswift@xxxxxxxxxxxxx writes: > > > I will tell you I am not happy with the Dimension IVs I purchased a few > years ago. Other people have raved about them, but I wouldn't > recommend them for the simple fact that I can't keep the whitewalls > white. They are yellowish. I've talked to several people, and tried > all their suggestions, but no matter how I clean the tires within a few > days or weeks they are dingy again. And this is without driving them. > > None of my other whitewalls has this problem. I'm sure someone else > will write in saying their's stay white, but I'm just telling you my > experience. I think if I had to buy new tires today I'd go with a > (gasp) Toyo Spectrum. The ww is not as wide, but the ride is good and > they're readily available. > > Mark M > > On Saturday, December 20, 2003, at 11:36 AM, RandalPark@xxxxxxx wrote: > > > I purchased my last set of Firestone 721's in 1997 and put them on my > > 1980 Lincoln Bill Blass Mark VI. Shortly after that I needed one > > replacement tire and was told that they were no longer available. The > > Goodyear Arriva went away in 1992. > > > > I have found an equivelent tire called a Dimension IV which I believe > > is made by Bridgestone/Firestone or possibly B.F. Goodrich. I have two > > sets of them on two of my more modern cars, the '81 and '84 Buick Park > > Avenues, and have worn out a set on the '81. The tires have the same > > white wall as the Firestone 721, and seem to be as good or better in > > quality. The set that I wore out lasted for 61,000 miles with out any > > trouble. > > > > When I replaced that set in September 2002, the tire store told me > > that they were GOING to be discontuned, but I have run into some guys > > with older cars that have purchased them since then, so they may still > > be avalable. > > > > Once the Dimension IV is gone, I am not sure where I will turn. I was > > told that Yokohama makes an equivilent tire, but I haven't been sold > > on their quality. More to come I am sure! > > > > Paul > > > > In a message dated 12/20/2004 11:49:25 AM Eastern Standard Time, > > imperial67@xxxxxxxxxxxxx writes: > > > >> > >> > >> Bad news, everyone. Firestone has discontinued the 721. I have spoken > >> to my > >> contacts at Bridgestone-Firestone corporate and there are none in > >> inventory > >> to be found, unless your local Firestone store has some stashed in > >> the back. > >> > >> Looks like one of our favorite modern-day products for our old cars > >> has > >> become another thing of the past... > >> > >> Both my IML-related cars have them now, but the set on my Imp is > >> approaching > >> ten years old and I was hoping to find one more set... Oh, well. > >> > >> Chris in LA > >> 78 NYB Salon (originally equipped with 721s) > >> 67 Crown > >> > >> RandalPark@xxxxxxx (RandalPark@xxxxxxx) wrote: > >> > >>> Bill, Firestone 721 whitewalls are great for '66. > >> > >> > >> > >> ----------------- http://www.imperialclub.com ----------------- > >> This message was sent to you by the Imperial Mailing List. Please > >> reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be > >> shared with everyone. Private messages (and attachments) for the > >> Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx > >> To UN-SUBSCRIBE, go to > >> http://imperialclub.com/unsubscribe.htm > > > >