Judging by Georg Boeger's chart, that allows for a 32mm tyre at the higher end of what will work.
Fixed link. That looks like Sheldon's chart prettied up but not otherwise altered, and look at the url: tandem-fahren.de
i.e. it's a table for fat Germans on tandems, who will naturally run high enough tyre pressures to get over the problem of using over-wide tyres on narrow rims.
My own recommendation is this:
which will work well for solos at tyre pressures appropriate for cyclocross
Fixed link. That looks like Sheldon's chart prettied up but not otherwise altered, and look at the url: tandem-fahren.de
i.e. it's a table for fat Germans on tandems, who will naturally run high enough tyre pressures to get over the problem of using over-wide tyres on narrow rims.
My own recommendation is this:
which will work well for solos at tyre pressures appropriate for cyclocross