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SVTPerformance's Chain of Restaurants
Tuning À la carte
Need new tires.. Help!
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<blockquote data-quote="firemanlightnin" data-source="post: 11347979" data-attributes="member: 34593"><p><strong>^^^Let me Google that for ya</strong></p><p><strong></strong></p><p><strong>From stangnet.com...</strong></p><p></p><p>Honestly I would get wider rims (10.5" width) if you plan on running 315's. Just think about it- 315mm = 12.4 inches of width.... You probably could fit most 315's on a 9" rim but I would say it is less than optimal. Rim width is very important for supporting your sidewall and it will affect your handling. </p><p></p><p>Besides getting a wider tire doesn't directly match up with more traction. The compound stickiness is a much more important factor than the width. If you are looking at drag radials... if you want to keep your 17x9's than why not a good 275 width dr like the 555r, the nt05r, etc?</p><p></p><p>Everyone knows they will fit. The point I am trying to make is that the 315's will work better on a 10.5" rim because they will get the sidewall support they need. Even though the nittos seems to run on the small side they are still without a doubt bigger than what is optimal for his current rim. </p><p></p><p>Everyone is always obsessed with the wheel width but the truth has always been that the stickiness of the compound is way more important. If I were to make up percentages, lets say compound is 90% of it and wheel width is 10%. Wheel width is only important for distributing forces so that to maintain the contact patch's coefficient of friction. Friction's equation is (coefficient of friction) x (normal force) </p><p></p><p>Putting a 315 on a 9" rim will offer no advantage over a 275 tire, in fact it might actually hurt performance due to tire not having the correct support and a jacked up contact patch- not the same contact patch it was designed for. You might be able to get marginally better performance if you went to the track and toyed w/ tire pressure and got the optimal pressure to finally get a decent looking contact patch etc. I've never seen a comparison w/ changing tire sizes but it would be interesting (both tires w/ same wear, same car setup, same rim, same tire pressure).</p></blockquote><p></p>
[QUOTE="firemanlightnin, post: 11347979, member: 34593"] [B]^^^Let me Google that for ya From stangnet.com...[/B] Honestly I would get wider rims (10.5" width) if you plan on running 315's. Just think about it- 315mm = 12.4 inches of width.... You probably could fit most 315's on a 9" rim but I would say it is less than optimal. Rim width is very important for supporting your sidewall and it will affect your handling. Besides getting a wider tire doesn't directly match up with more traction. The compound stickiness is a much more important factor than the width. If you are looking at drag radials... if you want to keep your 17x9's than why not a good 275 width dr like the 555r, the nt05r, etc? Everyone knows they will fit. The point I am trying to make is that the 315's will work better on a 10.5" rim because they will get the sidewall support they need. Even though the nittos seems to run on the small side they are still without a doubt bigger than what is optimal for his current rim. Everyone is always obsessed with the wheel width but the truth has always been that the stickiness of the compound is way more important. If I were to make up percentages, lets say compound is 90% of it and wheel width is 10%. Wheel width is only important for distributing forces so that to maintain the contact patch's coefficient of friction. Friction's equation is (coefficient of friction) x (normal force) Putting a 315 on a 9" rim will offer no advantage over a 275 tire, in fact it might actually hurt performance due to tire not having the correct support and a jacked up contact patch- not the same contact patch it was designed for. You might be able to get marginally better performance if you went to the track and toyed w/ tire pressure and got the optimal pressure to finally get a decent looking contact patch etc. I've never seen a comparison w/ changing tire sizes but it would be interesting (both tires w/ same wear, same car setup, same rim, same tire pressure). [/QUOTE]
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Need new tires.. Help!
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