First off, thanks to all who contribute to the forums. It's fantastic to have such an awesome source of information dedicated to the early Z cars. My small contribution follows:
Well after 19yrs, I finally decided to upgrade the wheels on my Z. It's just getting too hard to find a decent 14" performance tire. For the last five years I had been running 205/60R-14 Falken Zeix tires on my 14x6 "Iron Cross" wheels. These tires were OK but had a fairly soft sidewall. I used to fill them to 45psi to get decent response from them, though they ended up being fairly harsh over bumps.
After much research, I decided on 16x7 Konig Rewinds (Gun Metal). I got them from Discount Tire Direct for $125 each (plus $50 online ordering rebate).
Next to tires. I did a lot of research (http://www.caranddriver.com/reviews/comparisons/09q2/tire_test_nine_affordable_summer_tires_take_on_the_michelin_ps2-comparison_tests/dunlop_direzza_sport_z1_star_spec_page_11) and decided on 205/50R-16 Dunlop Direzza Sport Z1 Star Spec tires, an "Ultra High Performance Summer Tire" . I got also got them from Discount Tire Direct for $114 each (plus $50 Dunlop Rebate).
New wheels and tires :
Below is a comparison of the two wheel/tire combinations. According to the tire size calculator I used (http://www.miata.net/garage/tirecalc.html), the new wheel/tire combination should be 0.4" taller, which looks about right.
Though the treadwidth of the tire is the same, you can see the difference between a 6" and 7" wide wheel.
After I pulled the old wheels off the car I weighed the old and new combinations, with the following results:
- 14x6 Iron Cross with 205/60R-14 Falcon Ziex tires - 37lbs;
- 16x7 Konig Rewind with 205/50R-16 Dunlop Direzza's - 39.5lbs.
Now for the results:
NOTE: My car has Suspension Techniques Sport Springs and Anti-Sway Bars installed. The ST Sport Springs lower the car approximately 1.5" over stock.
My first impressions after last night's drive follow:
- there are no clearance issues/rubbing with this combination on my lowered car;
- after pulling out of the driveway, the tires immediately picked up the sand that remains on the road after the winter (200 Treadwear rating), and peppered the wheel wells (once I got to clear roads, this issue went away);
- I found this wheel/tire combination (tires at 46psi) to be more compliant over bumps than my previous combination;
- road noise wasn't an issue for me as I have a "sporty" exhaust and drive with the windows open, but wasn't any greater than my previous wheel/tire combination;
- now to performance, WOW!!!!!!! What a difference in steering feel/response, cornering is much flatter with increased confidence (I wish I'd made the upgrade earlier).
- finally, I think they look great, so does my son;
As an aside, I knew that I was going to have to replace my clutch soon (I've got 30,000 miles on the current clutch). Well, these new tires have great traction. So much in fact, that their traction exceeds the "traction" of my clutch. After a spirited start where the revs increased much faster than forward progress would indicate (at first I thought I was spinning the tires), I realized that I'll need to replace my clutch in the very near future.