majik16106 Posted November 7, 2003 Share Posted November 7, 2003 Ive seen some people who have street cars use say a nitto 555r on the back and a regular 455 on the front. Usually i see people use drag radials on the rear with regular good tires on the front which makes sense to me for a more drag racing oriented car. Im wondering though, for someone who enjoys spirited drivign as well as occasional auto-xs or track days, would it make sense to do something similiar and run like a yokohama a032R on the rear with say a yoko es100 on the front? or is it better for street driving to have the same type of tire all the way around? I could see where the grip would be an issue on the track, but what about the road? Quote Link to comment Share on other sites More sharing options...
johnc Posted November 7, 2003 Share Posted November 7, 2003 > I could see where the grip would be an issue > on the track, but what about the road? Grip is grip regardless of where you are. Quote Link to comment Share on other sites More sharing options...
auxilary Posted November 7, 2003 Share Posted November 7, 2003 unless those people enjoy spending lots of money replacing tires.... it's just cheaper to invest in a set of steelies with all season tires for daily driving, and run race tires at the track. Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted November 7, 2003 Share Posted November 7, 2003 I am a big fan of the Nitto555 DR as an everyday street tire on the rear. I have been running them for years and my current pair has seen drag strip duty (now hopeless), a round trip to Montgomery, 4 trips to Reynolds, GA, several shorter in-state trips plus street duty. On some of those long trips I have driven thru monsoons on the freeway and was more concerned the sh*tty Z wipers, defroster and exhaust fumes than I was about the tires. Never a hint of any aquaplaining. They are less than 1/2 worn so I expect to get at least 7000 miles out of them. As for using them on an auto-x or road race track, do not estimate their potential but you are best suited to have tires of equal grip. Do not classify the Nitto DR in the same light as the BFG. Just a pity there are not good sizes for the standard Z. Quote Link to comment Share on other sites More sharing options...
majik16106 Posted November 7, 2003 Author Share Posted November 7, 2003 > I could see where the grip would be an issue > on the track' date=' but what about the road? Grip is grip regardless of where you are.[/quote'] Not what i was getting at, what i meant was.. on a road course i can see why the difference in holding grip could make a difference. Having a rear tire that holds the track at high speed turn with a front tire that wont. scottie is saying what I figure'd Id hear, use something like a 555r on the rear with a 455 on the front, see, i was going to use an es100 on the front and the yokohama a032r on the back, i know a few people who actually really like the a032r as a street tire. Quote Link to comment Share on other sites More sharing options...
johnc Posted November 7, 2003 Share Posted November 7, 2003 Having a rear tire that holds the track at high speed turn with a front tire that wont. And my reply answered just that. Basically you are building in a LOT of understeer by running stickier tires on the rear. Since the Zs chassis has understeer designed in from the factory, why would you want to significantly increase it? I'm sure it would come back to bite you on a rainy day or in an emergency situation. Quote Link to comment Share on other sites More sharing options...
majik16106 Posted November 8, 2003 Author Share Posted November 8, 2003 ok, i see what your saying, i misunderstood your reply. I realize that much though, but im not talking about for the track, im talking about for the road, the street. at a track ill be dropping down to 16's with v700's or hoosiers or maybe the a032r. Basically my question is.. from a stand point of streetability, style, and some functionality in spirited street driving(typically straighter, from a roll) is there any major issue other than uneven tire wear associated with running say a 315/35/17 ao32r on the rear with a 235/40/17 es100 on the front? Basically im thinking of doing what these guys do with DR's, except im not using dr's.. just stickier meaner tires. also note: ive been told by lots of people that a 285/40/17 will fit on an 11inch wide wheel.. has anyone actually seen this done? id be afraid it would stretch a good bit leavnig the sidewall kind of unstable... Quote Link to comment Share on other sites More sharing options...
johnc Posted November 10, 2003 Share Posted November 10, 2003 I run a 275 on a 10" wide wheel so a 285 should fit fine on an 11". Quote Link to comment Share on other sites More sharing options...
majik16106 Posted November 10, 2003 Author Share Posted November 10, 2003 I wonder if it will look really stretched or if it will look big, i knwo a 315 is perfect and a 335 fits as well... anyone give me any advantage or disadvantage, i was told once to use the smallest tire on the biggest rim possible, but ive ehar the biggest on the biggest rim is good, but someone told me today you should get in the middle.... is this all crap or is there a noticeable difference? will a 335 look/ have a wider patch than a 285? Quote Link to comment Share on other sites More sharing options...
johnc Posted November 10, 2003 Share Posted November 10, 2003 A 315 should be on a 12.5" wheel and a 335 should be on a 13" wide wheel if you're considering performance. Rim width should be equal to section witdh to get the best performance out of the tire. A 285 width tire ideally should be on a 11 to 11.5" wide wheel. Quote Link to comment Share on other sites More sharing options...
TimZ Posted November 11, 2003 Share Posted November 11, 2003 Having a rear tire that holds the track at high speed turn with a front tire that wont. And my reply answered just that. Basically you are building in a LOT of understeer by running stickier tires on the rear. Since the Zs chassis has understeer designed in from the factory, why would you want to significantly increase it? I'm sure it would come back to bite you on a rainy day or in an emergency situation. I have yet to see anything of substance about the lateral force capabilities of any drag radial. It seems to me that these tires are designed to optimize their performance on the longitudinal axis, which probably means that their effectiveness on lateral performance has been compromised. I'd be more worried about generating an oversteer-prone car, if the tires on the front were something like the A032s for example. Maybe 315 drags on the rear would have enough lateral capability, but I've never seen any reputable data on exactly what their performance is, other than for drag racing. It's a wild card, at best. Also, as I recall, these tires are generally not speed rated, and are not designed for sustained high speeds. Again, not a problem for drag racing. Quote Link to comment Share on other sites More sharing options...
TimZ Posted November 11, 2003 Share Posted November 11, 2003 Oops - just noticed that John was referring to a road racing tire in his post, not a DR. Sorry. Quote Link to comment Share on other sites More sharing options...
majik16106 Posted November 11, 2003 Author Share Posted November 11, 2003 ok john, thats good to know, i have a lot of respect for you as im a young aspiring road racer and thats what you do, the only local guy i know with the knowledge is eddie radatz.. whos cars are always top 5 in scca champ. EP classes. But he is a purists and really wants nothing to do with my project, in fact everytime i need anything from him he alwasy tries to get me to stop what im doing. Out of curiousity though, why is it that the rim width should be equal to section width? is there some sort of math to it or are there disadvantages to having a stretched or bubbled sidewall or is it just one of those things i should just know? Quote Link to comment Share on other sites More sharing options...
johnc Posted November 11, 2003 Share Posted November 11, 2003 I would listen to Eddie. Sometimes us so called "experts" tend to want to do things the way we've always done them. That's until some upstart beats us and then we have to rethink what we thought we knew. Regarding the relationship between the tire and wheel. I spent some time talking with Jeff Speer at Hoosier and he expalined that sidewalls on radial tires should be as close to parallel as possible. This allows the sidewalls to flex in sync (sort of) and keeps most of the tread in contact with the ground. Quote Link to comment Share on other sites More sharing options...
majik16106 Posted November 11, 2003 Author Share Posted November 11, 2003 ok, see, that makes sense to me, thats what i would have figured if i had to take a guess, i just didnt know if there were something a bit more mathematical to it. im sure ti could be expressed in physics with a lot of equations, i just didnt know if there were anything to it other than the give of the sidewall. ok, in that case ill be running 285/45/ kuhmo mx's. So heres my other question, which i think i put in another forum, as far as the backspacing on the wheel goes, would me running 4 inches of backspace put enough extra stress on the bearings to cause the bearing to fail Very quickly, i know it will stress it a bit more, but i didnt know if the effect would be very bad or just slightly worse than stock. I saw Dan is using a 4.5 on his 10, i was thinking about using a 4.5 on my 11, but Ross C wants me to go with 5. Since im using 17s i dont need 8 inch springs or sectioned struts really. Which makes me worry that the bigger spring might hit the tire, so i had planned on the 4inches to be 1)safe and 2) it would come to the edge of a 280yz flare.... Quote Link to comment Share on other sites More sharing options...
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