I don't have the wheel and tire combo in question. However, it is possible to deduce clearance based on information you provided. I venture a better guess if you stated your existing wheel width.

235-225 = 10mm wider

10mm x 1/2 = 5mm on each edge 

ET25-ET23 = 2mm inward "push"

5mm - 2mm = 3mm net inward

The Van Cafe wheel you referenced is 7.5mm wide. Assuming your old wheel is the same width, you only need to contend with 3mm.

However, if the old wheels are narrower, it will likely present some clearance challenges. The width of the wheel also dictates how the sidewall will budge. Even tires in the same size from different manufacturers can differ enough to be a problem even on the same size wheel. 

BenT
sent from my electronic leash

> On May 11, 2014, at 9:13 PM, Joel VanderKwaak <joelvanderkwaak@GMAIL.COM> wrote:
> 
> Howdy,
> 
> I have a set of these:
> 
> http://www.van-cafe.com/home/van/page_1572_341/carrot-alloy.html
> 
> running 225/75-15 tires.
> 
> The ET on these is 25, and I do not have any rubbing on the sliding door.
> There's an obvious gap that I haven't yet measured.
> 
> I'm wondering if anyone in vanagon-land is running 235/75-15 on them, and if they have rubbing on the sliding door.
> 
> I've seen 235/75-15 mounted on GW wheels, with an offset of 23, and they just barely rub. So I'm wondering if I can get away with this. It's relevant as there are more tire choices in the larger size.
> 
> Happy Trails,
> 
> Joel