@James posted:I have 185/65R15 tires on 4.5" wide rims which is too wide of a tire for that rim (clearance problems in the rear determined this decision).
I agree mostly with this. The minimum recommended width is 5" for that tire size. I have the same on the front of my Spyder. However, I am running the Vredestein Sportrac 5(NLA) tires all around(195/60R15 on 5.5" rear). I'm not of a mind to be overly concerned about the 1/2" difference from the recommended.
I run 22F and 26R in my Spyder(Speedsters require MORE pressure in the rear). I would say the handling is as sharp as could be desired for a 1950s design(actually 1930s, right?). I actually CAN run with or faster than some modern Porsches, both on the street and the track. I attribute this to seat time, I've been Spydering for 18 years and LOTS of miles.
The tires make a WORLD of difference. As do the front shocks. I have NOS Koni adjustable oil shocks (set at full soft) and these two changes have transformed the car.
The Konis are adjustable in rebound only, compression is non-adjustable.
To finish this up, I have a custom-made(by me) font anti-sway bar. It is 16mm(approx. 5/8") and has custom heim end links and levers welded to a shortened stock 911 front bar. I used two urethane sway bar mounting brackets, bolted and welded mounts directly on the beam.
Since my car has a swing axle, there is no rear bar.
The handling is neutral to not-easily-provoked oversteer. But it CAN be provoked with ham-fisted driving and injudicious throttle and brake stabs.
Great luck to you Gary in your search for better handling. It can be had, but likely won't be transformed with one thing. You'll have to work at it a bit to get where you want to be.