I tried 400 in hex, I can try some other values later, what is the max height I can use in hex? Is it ffff? I can't try it now cause I got a doctors appointment in a bit. Or what is the smallest tires values for front and rear? I have the basecodes. Again, I have a gameshark2 v5, that's what it says on the memory card screen, but on the disc label it says v1.1
Yeah a ride height of 400, you would definitely see if it worked, my best conclusion is that either you entered the code wrong, or more likely your master codes do not cover the memory addresses for the setting. To test my mastercode theory, try adjusting the spring rates with the codes to one of the extremes either 0.1 or 25.5, take the car for a spin to see if the code worked, if the code didn't work make sure to use all the same master codes I do (as posted earlier and located in the 1st post), and try again. If the spring rate code works, then I am not sure why you are unable to get the ride height to work.
Not sure what the max usable height would be, I have been up around 600 before without any problems (if I remember correctly). Though the max value you could put in is FFFF, I am skeptical that the game would allow 65,535mm to be used, maybe I'll test the limits of that code tonight, after I finish shooting video of my Model T Hybrid I have been working on.
As far as the smallest tires, try to code for the mini one tires, they are pretty small:
FT - Racing Super Soft - Mini One
10A1F830 0000B179
RR - Racing Super Soft - Mini One
10A1F838 0000B173
Also try out the Range Stormer Suspension, it has a large range of adjustable ride heights, from like 180ish-330ish.
One more thing, you have downloaded all the supporting documents in the 1st post of this thread, right? Mainly the Excel spreadsheet, which contains most of the usable values for most of the parts, it is an essential resource for building hybrids.