You don't really want anything larger than that on a road bike!?
I do have 38mm on the carbon road bike...
doesnt count if you're running 650C wheels....
I have 28s on my caad and it's lovely. Wouldn't want less now.
Or 700c 30mm.
TBH, it's more about the fact there's not much choices for other than just you, having a bike that limited you to 25mm can be a little annoying.
@Dick started
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I do have 38mm on the carbon road bike...