Any current info on this subject? I checked threads going back ~1yr.
I just got turbo wheels so I now have 2 sets of 19" (carerraS). I planned to mak them my track wheel, but most trackers use 18" (I think) because of more (and better?) options/compounds. Are there more options for 19" now, and are there reasons because cost for going with 18"? Someone said turnin felt more positive on 19s...any drawback? Thanks for any

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Mojozone
"There is a difference between knowing the path, and driving it" - adaptation of Morpheus, The Matrix

I don't think there have been any recent additions to the R-compound tires options in 19" sizes. I think you're correct that one of the major reasons why so many track on 18s is the greater range of R-compound options, and their lower cost. But I ran across a thread on rennlist recently where some argued that 18s are also "better" on track than 19s, at least for the Cayman. Yes, the general understanding is that a shorter sidewall will flex less on turn-in, providing a crisper turn-in, but I don't know what that might mean in terms of lap times. I had posted on that thread that I didn't think tracking on 18s versus 19s would make a noticable difference, but someone who had tried both posted that 18s are better than 19s.

Thanks Jim. I just swapped my Carerra S wheels for turbos and trying to decide whether to keep the Carerra S (19") as track tires or exchange for
18" Alot of the threads go back about a year. Thanxxx again...Mike

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Mojozone
"There is a difference between knowing the path, and driving it" - adaptation of Morpheus, The Matrix

Also 18" wheels and tires weigh less than 19" (usually), and it's unsprung weight (which means you can multiply the total weight difference by 4 to get an idea of the effect of the extra unsprung weight). Depending on which wheels and tires, that difference can be significant.

ditto - lot's of choices from Toyo, Kumho, Michelin, BF-Goodrich.

The difference in sidewall height and stiffness isn't huge. An 18" R-Compound tire has a pretty short, firm sidewall to begin with.

For cost reasons alone, it make sense to stick with 18" wheels.

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Thanks spindoc and drvreg for the guidance...now I need to look at weight of 18s. Great looking car drvreg! Cheers...Mike

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Mojozone
"There is a difference between knowing the path, and driving it" - adaptation of Morpheus, The Matrix