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Message: <blockquote data-quote="ReplicaR" data-source="post: 1005093" data-attributes="member: 9209">Rich, the answer to your question is below.I have taken some pictures of the pulled fenders and mounted the wheel for another test fit. Fenders were pulled about an inch so it left me covering exactly the same amount as it did with the Cobra R wheels I had (smaller offset, 1 inch narrower) Here are some pictures of how the wheel fits on the car at ride height.<img src="http://i50.tinypic.com/2h5jmew.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i45.tinypic.com/29uouj8.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i47.tinypic.com/nnk105.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Now, onto the difference between the wheels themselves. Obvious difference is the weight. Original Japanese made Cobra R is tipping the scale at 22 lbs, while RPF1 being one inch wider is actually 5 lbs lighter at 17 lbs.<img src="http://i48.tinypic.com/21abscz.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />The way the tire sits on the wheel is different as well. Talking to a few of my friends who do time attack, and most tire experts, they are all convinced that your contact patch has be just a little bit smaller than the width of the actual wheel to get the most out of the tire, and make it more responsive under fast corners. You can really see that a 9 inch wheel is not an optimal choice for a 275 R comp from pictures below. <img src="http://i47.tinypic.com/10hoig0.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i49.tinypic.com/2yjyq6e.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />You can see in the picture that the sidewall on the 9 inch wheel is bulging quite a bit, while on a 10 inch wheel same tire sits perfectly flat. Note another thing from the picture below, how the contact patch looks like. The closer wheel is the 9 inch one. You can just tell by the contour of the surface, that it's bowing out, curves around the edges. The contact patch on the 10 inch wheel by contrast is a lot flatter, and might actually be able to put more tire on the ground. I know that some will say, oh but the tire is not under load. That is true that the tire will flatten out under the load and create the necessary contact patch, but it will not bring down the edges which are still rolling over due to sidewall being deflected.</blockquote>