Tyre thoughts

[ratbane]

My Chim 400 was running SO2 PP's front and back. 205/50/15 and 225/55/16.

I used to run them at 22PSi and 25PSi front/back resp, and found that pretty near perfect.

I recently changed the backs for Dunlop SP9000, and intending changing the fronts in about 6 months as there's plenty of wear left in the SO2s.

I have maintained the PSi as before, but find the car now has a tendancy to oversteer slightly more than with the previous setup.

Any ideas, eg would increasing the pressures on back or front tend to reduce this??

[jason1788]

In general, within a small range increasing pressure reduces grip and vice versa. Try running the rears at 23 or 24 (should be 24 anyway according to my handbook).

[ads]

I have the same tyres as you, S02's front and SP9000's rear. I'm running the fronts at 22psi front and 26psi rear. The SP 9000's have a softer sidewall compared to the S02's, so adding more pressure stiffens them up a bit. Mine seems to handle fine now.

[ratbane]

Thanks guys. Very helpful.

[FlipFlopGriff]

Same here. Toyo and SP9000 have softer sidewalls so 2 PSI above the book seems to work - 24 front, 26 rear.
FFG

[JR]

ratbane said:

My Chim 400 was running SO2 PP's front, 205/50/15

55 or 60 profile is normal.