Front 225 on AP2 rear wheel?
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Originally Posted by VitaRenovatio,Apr 11 2009, 09:44 PM
Thanks, Jaku! Very informative information... esp. the part about Emilio actually testing the same tire on different width wheels out on the track. I think I will go for 225 R-comp on AP2 rear.
Will AP2 rear with 10mm spacer fit in the fender without modification? Or should I try 5mm first? Or no spacer at all (but would probably mean that the tire would be closer in than on a AP2 front wheel, and I would have clearance issues at full lock).
Will AP2 rear with 10mm spacer fit in the fender without modification? Or should I try 5mm first? Or no spacer at all (but would probably mean that the tire would be closer in than on a AP2 front wheel, and I would have clearance issues at full lock).
and you know you can only use up to 10mm to stay +55 offset wihtout any points in s2k challenge, so you are safe
and like i said, test suspension parts one by one, so try without spacers before you decide to go with spacers or not
the full lock clearnace is not a big deal, just remember not to turn full lock, there might be a chance it won't rub cos i had this setup before and i didn't have rubbing issue, maybe 9" with +63 will rub
#13
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Originally Posted by Antonov,Apr 11 2009, 11:49 PM
How exactly do stretched tires provide greater lateral force?
#15
My advice would be to jump right into the non-staggered neighborhood when its time to purchase new tires. The wing should be sufficient, you just will have to make adjustments to balance it out.
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Originally Posted by rob.ok,Apr 12 2009, 12:01 AM
My advice would be to jump right into the non-staggered neighborhood when its time to purchase new tires. The wing should be sufficient, you just will have to make adjustments to balance it out.
#17
Originally Posted by Jaku,Apr 12 2009, 01:06 AM
he is calculating his points advantage for street class, thus many thoughts what's best with limited mods
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Originally Posted by Antonov,Apr 11 2009, 10:49 PM
How exactly do stretched tires provide greater lateral force?
This is my theory: If the tire width is 9.1" wide, then it is being squeezed by the 7.5" wheel. On a 7" AP2 front wheel, I feel like this would cause bulging of the tire and compromise the sidewall stiffness and "squareness" of the tire (kind of like how autocrossers try to fit huge 275 width tires on 7.5" AP1 rear wheel). This would decrease the "sharpness" of the tire (interpreted as "crisp" turn-in) and also probably cause uneven wear, probably in the center section at optimal tire pressure, as if the tire were over-inflated; but decreasing tire pressures would reduce performance.
If I were to guess, a wider wheel would increase the spring rate of the tire, increase the crispness of turn-in, increase feedback, produce more even wear, and most importantly increase grip.
From my previous two sessions on RE-01Rs, I feel like even 225 RE-01R's are being pinched by 7" front wheel...
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Originally Posted by rob.ok,Apr 12 2009, 12:13 AM
Oh....I guess I missed that part. Then yeah.....it sounds like the best option plus it leaves the door open to go to the next level.
1.25 = APR GTC-200
3.50 = R888
0.25 = CR Front
0.00 = 2008 front spring
0.00 = SPC Camber (-3.0 F/R)
#20
Judging from Toyo's website, it seems as though they recommend running a 225/45/17 on a 7.5" wheel.
Other things to consider is the fact that rear wheels will be somewhat heavier, plus the $ spent on the wheels, plus making them fit.
In your particular case (S2000 Challenge Street Class), I think it might be worth the compromise since ultimately you will need more front grip but don't have the points to run a proper front tire.
Having said that, I am of the opinion that stretching radial tires is not the proper way to maximize mechanical grip. Racers in the past stretched rubber to maximize grip with bias ply's, but modern day radial tires are not designed to work that way. I can go on and on, but I suggest you read "The Racing and Performance Tire" by Paul Haney.
Always do research on your own, as many times inaccurate information is posted on public forums.
Dino
Other things to consider is the fact that rear wheels will be somewhat heavier, plus the $ spent on the wheels, plus making them fit.
In your particular case (S2000 Challenge Street Class), I think it might be worth the compromise since ultimately you will need more front grip but don't have the points to run a proper front tire.
Having said that, I am of the opinion that stretching radial tires is not the proper way to maximize mechanical grip. Racers in the past stretched rubber to maximize grip with bias ply's, but modern day radial tires are not designed to work that way. I can go on and on, but I suggest you read "The Racing and Performance Tire" by Paul Haney.
Always do research on your own, as many times inaccurate information is posted on public forums.
Dino