Largest tires on first gen?

Hello all,

I?m looking to see what the largest tire is that anyone has fit on a first gen Attex WITHOUT heating and altering the body? I am thinking ahead to my next ST/300/D project and came across a good deal on a set of 23?s that I?d like to jump on if they?d fit. I rarely have time right now to get over to my shop and do some measuring myself so I thought I?d ask on here first. I don?t think the issue would be the space in between the tires/them being able to clear each other, but rather the clearance between the top of the tire and the body above it.

Thanks in advance!