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@ugosantalucia
It's not so simple. It's not about the width only, but the way the rim is curved in the bed. I find Ambrosio Nemesis is perfect, it can take a wide range of tubular tyres, from 22 all the way to 32 mm and they all sit very well. Other rims are far less versatile.
Generally speaking most rims on the market will take a 25 no problem, the TB 25 is a particularly narrow one with a curvature which is not the best.