235/40/18 vs 245/40/18 - which is better for 9j?

Discussion in 'Suspension, Brakes, Wheels & Tyres section' started by RS_Jamie, Oct 16, 2019.

  1. Hi all, find myself in the position of looking into tyres for some new wheels. I was wondering if people can share experiences and preferences? I’ve heard you don’t need more than 235/40 but 245/40 looks more chunky.

    Any help is appreciated!
     
  2. -Jamie-

    -Jamie- RSM Moderator

    245 40 or even 255/35


    Could even get a 265/35 on if you wanted, I ran 255 on my 9J OZs
     
  3. Is there a big difference between the two?
     
  4. i run 255's on 8.5j with no problems
     
  5. Can't see you running a 255 tyre on a 9J rim on the rear without serious arch modifications
     
  6. -Jamie-

    -Jamie- RSM Moderator

    Plenty of space to do so [emoji2369]


    Even run some current spec BTCC slicks all round if you wanted
     
  7. What offset 9J wheel did u run at the rear with a 255 tyre and how much camber
     
  8. I went with 235/40R18 on my 9J ET55, mainly because I was worried about rubbing - I'm also not running any negative camber. They do end up looking a bit stretched, but not excessively, so I kept them on. :smile:
     
    RS_Jamie likes this.
  9. -Jamie-

    -Jamie- RSM Moderator

    ET45, ET55 and ET50. ET40 was too tight

    Camber varied from stock to over - 2 degrees
     

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