Re: Toyo R888s (John2x240)
I've raced on both, although I've had significantly more seat-time driving on RA-1s. Frankly, I don't find the R888s to be as much better as they are hyped to be. Yes, they are excellent, and I won't go so far as to say they're overrated, but I simply don't find the difference between the two to be significant. The biggest difference I've noticed about the R888s is that they break away a little more progressively, which can be a good or bad thing depending on your style and/or setup. They are also significantly noisier, but that's not really a concern for most.
I will say they are better, but the two things I pointed out are their biggest differences I've found. In terms of characteristics, both are very similar. I wanna say R888 compound feels slightly softer, but that is not evidenced in wear as I've found no real difference in life-span. They do, however, heat up quicker and cool off a little slower than the RA-1s.
I wouldn't change to another brand...the Toyos are about as good as it gets for R-comps (at least with any sort of tread...I'm a big fan of R6s). I have MPSCs on one car from the factory and was forced to run them on another due to sizing and they are simply not as good as either of the Toyos all around.
I guess I could formulate more of an in-depth evaluation of the R888s over time as I've only been through one set vs. countless sets of RA-1s. If you're getting new tires, though, I would definitely go with the R888s.