David,
They might be, but I have found that the 225s on my car perform really well, and I think at the time I purchased then, 14 years ago, I am not sure if 235s were even available.
And, I woulsnt be surprised if 235s will be difficult to remove through the space that is available in the 59/60 rear fender opening.
Bruce,
The Tassie Devil(le),
60 CDV