track wheels and tires
hi. looking to set up my old OEM 17" wheels for track-only duty. 7" front and 8.5" rear. questions ...
what is the widest folks are comfortably running on these things at the track? on my 8.5"/10" 18" wheels i am currently on 245/275 and was just as happy previously on 235/265. i think 235/265 would be a stretch (get it? get it?) on a 7"/8.5", but the internet tells me it has been done. otherwise 225/255 seems pretty standard. tires? had my heart set on hoosier r7's, but the sizes are just not there. i need DOT to stay in my class, but want something more aggressive than an nt01. bf goodrich r1? toyo rr? thanks for any advice. |
225/255 is what I run on 17's 7" & 8.5"
RE-71s are a good choice for a DOT tire |
Boxster Spec races with 235's on the front 7" wheel with no problems. On the rear, 255 is stock so you can probably go 275 on the 8.5" wheel but I'm not sure about clearance (maybe someone else can address that).
Toyo RR or R888 (R-copmpound) will be the fastest DOT tires. |
I did exactly that. I powder coated a set of 17" Boxster twist wheel ( 7in F and 8.5 in R), and put Hankook R-S3 tires, 225/45s F and 255/40s R. I ran one complete DE on them. The R-S3s aren't the grippiest DOT tires, certainly not in the rain, but they are the value/price ratio is pretty good. They also talk to you very well and don't get too slick when hot. I figure even if I go through one set of them every year, that's not bad.
The 225s are already a little wider than I would want for the front 7in, but the 255s are fine for the Rear 8.5s. |
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Good luck! |
Price/longevity/grip is very good on the Hankook R-S3, for HPDE they are very good and are a blast, and they are very talkative. For timetrials with a 200tw limit, the RE-71R, the new Rival S, and the ZII star spec are faster at the cost of more rapid wear and reduced lifespan. An extreme example of this is a friend that runs autocross with Hoosiers estimated his tire cost in 2016 at $22 per 60-90 second run. If you want to win time trials in 200tw it is Rival S or RE-71R.
For HPDE I am all Hankook, but that is probably only because I have never run the RE-71R :) Another friend in a Cayman runs that tire, he like to slide around a lot, and he goes through 2-3 sets in the time it takes me to run through one set of R-S3. |
Yes, choose your contact patch carefully based on your goals.
Competing for a championship, you want the best grip possible regardless of cost. That means a fresh set of R7s every track weekend in a DOT-R class at $1600. If you are running in a 200tw TT class you can have just as much fun and save a lot of cash with RE-71R. They will be good for 4-5 weekends and a set is around $900 installed. Just DEs for kicks and grins? RS-3, AD-08, Direzza SS IIs, RE-11. All of these tires are viable track rubber that will hold up for 6-10 Track weekends depending on the driver and cost less than $900. A DE is non-competitive so forget chasing those GT3 Cup cars in your Boxster and just shoe up for fun. |
thanks folks. I am building a nasa st-3 car to race with the regional association up here (a modified version of nasa pending full adoption) 20 minute sprints. I am allowed dot tires to 275 (to keep the weight and hp reasonable, anyway). I was trying to keep the initial entry cost down and run on the 17" for the first season (fire suits, transponders, fire suppression; all adds up quickly) but am finding tire sizing limited. I may put the 17's on my street car and move the 18s onto the race car.
regardless, good to know that a 235 works on the 7" front - balance is good with a 235/255 combo? also, I've read good things about the bf Goodrich r1-s compared to the hoosier r7 - any experience with these? thanks. |
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R1- Good grip, last longer, not quite as fast as prime HC R7s. (1 sec/lap??) |
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235/45-17 will fit on a 7" wheel with Re-71's?
It doesn't squeeze it too much? If so, Ill go that way as I probably have some points available |
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Here are some pic's of the Boxster Spec tires and wheel sizes...
235/45/17 on 7" wheel: http://i1114.photobucket.com/albums/...pszkwfx4so.jpg Close up of sidewall of 235/45/17 on 7" wheel: http://i1114.photobucket.com/albums/...ps7c1wgamp.jpg 255/40/17 on 8.5" wheel: http://i1114.photobucket.com/albums/...ps4wujzahm.jpg |
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