Thanks Jim . . . .
You have confirmed what I suspected, and indeed, was hoping - what I didn't say in my post was that I had already fitted Paselas and hoped that was the right choice!!
I have been using Duremes on my Ripio - they have been excellent for mixed riding, but as I am doing some longer sponsored rides in late May, weight and speed will count for quite a bit, distances will be longer than I have been used to and a lot of the others will be on 'roadier' bikes.
First impressions of the Paselas is that they are quicker, livelier and seem faster than the Duremes - seem is perhaps the operative word, as these things are very subjective unless you test them properly, and the smaller tyres are almost bound to feel livelier!! But I have only ridden very short distances after changing.
All in all, I reckon I have made the right choice as wrist comfort etc is important.
lewis