275/40/17 On A Bnr32 ?

[cobrAA]

Hello guys,

I run a set of 17x9.5 rims. I'm using 245/40 at the moment, I dont like the grip of these. My only track experience is drag but I might be tempted to try time attack/lapping next summer.

I'm looking at Star spec, RT615k, Ecsta XS or the RS-3 ( good tires but still good treadwear for street driving).

The problem is that nobody make 265/40. It's either 255/40 or 275/40. I can imagine that the 275 might create a bit of sidewall flex when lapping ? Does the flex also apply for straight line acceleration?

I already rolled my fender for 245 but I'm not sure if 275 would fit in front ( I'm not slammed but like any cars with coilover, I'm lowered).

Obviously, I would like to run the largest possible without creating new problems ( sidewall flex or rubbing issues), would that be 255 or 275 ?

thanks a lot.

[Frosty]

depends on wheels/offset/sidewall size. all factors of making the wheels fit! to get less flex drop to a /35 profile maybe? id personally stick with a 255 up front as a max

[GTSBoy]

If you currently have a 245/40, you do not want a 40 profile tyre at 275mm wide. For 275, you need to change to a 35 profile tyre to keep the sidewall height the same.

Whether that width will fit in your guards or not is another matter. On an R32 I'd say you'd be pushing your luck.