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I like the tires, but you should take a few things into consideration. For starters, I think the size change may affect overall balance because the fronts will be wider and probably grip a bit better. If so then of course it will shift towards less under-steer (more over-steer.) To me that’s a bonus on an otherwise stock suspension but it’s not for everyone.It’s also important to note that the RPM spec is affected by rim width. The value of 872 is based on a 7.5 inch rim. On a 7 inch rim (the recommended minimum) it will pucker up slightly and lower that number, but still not enough to be a problem with TCS. However, that probably puts you close to 24 inches which means you raise the front by nearly 0.2 inches relative to the rear. That doesn’t sound like much but one of my long-standing complaints about the stock NSX suspension is that they are dead level on new tires. As the rears typically wear twice as fast as the fronts you end up with the rear of the car lower than the front. Not much, but enough for me to see it, which looks dumb, and more importantly is aerodynamically bad generating lift at high speeds causing the front to be light. The stock setup is marginal IMO, but starting 0.2 inch high in front would make it worse.So, that’s the long-winded explanation of why I would go to the 255/40/17 rears instead. Like the fronts they will be on the minimum recommended rim which isn’t ideal, but you will retain more of the familiar balance and keep the car closer to level. The down-side is that they give you 1.2% taller effective gearing and weigh slightly more, but life is full of tradeoffs.
I like the tires, but you should take a few things into consideration. For starters, I think the size change may affect overall balance because the fronts will be wider and probably grip a bit better. If so then of course it will shift towards less under-steer (more over-steer.) To me that’s a bonus on an otherwise stock suspension but it’s not for everyone.
It’s also important to note that the RPM spec is affected by rim width. The value of 872 is based on a 7.5 inch rim. On a 7 inch rim (the recommended minimum) it will pucker up slightly and lower that number, but still not enough to be a problem with TCS. However, that probably puts you close to 24 inches which means you raise the front by nearly 0.2 inches relative to the rear. That doesn’t sound like much but one of my long-standing complaints about the stock NSX suspension is that they are dead level on new tires. As the rears typically wear twice as fast as the fronts you end up with the rear of the car lower than the front. Not much, but enough for me to see it, which looks dumb, and more importantly is aerodynamically bad generating lift at high speeds causing the front to be light. The stock setup is marginal IMO, but starting 0.2 inch high in front would make it worse.
So, that’s the long-winded explanation of why I would go to the 255/40/17 rears instead. Like the fronts they will be on the minimum recommended rim which isn’t ideal, but you will retain more of the familiar balance and keep the car closer to level. The down-side is that they give you 1.2% taller effective gearing and weigh slightly more, but life is full of tradeoffs.
