Inspired Cycle Engineering, Ltd (Cornwall UK) http://www.ice.hpv.co.uk/
Makers of the respected Trice Tadpole Trikes, two models now.

'Not sure that ICE only has two models. Currently they supply 26 inch rear wheel and 20 inch rear wheel versions of both their Q and T models. If you then add the standard width and NT (narrow track) versions of both trikes, surely you have eight models in the range. Or are you simply classifying these as variations of the same two models? Even though they change the look, feel and ride of the machine, I have not included the hard shell seat variants of either trike. But only because these sports-type seats are high-cost options which some prospective owners may not wish to consider. By the way ~ All the 26 inch wheel machines have non-folding frames, so not as easy to transport…

I appreciate your point, but I’m still inclined to think of them as eight separate models. However having checked the ICE website I see they only publish two prices, one price for their 26 inch model and the other for the slightly dearer 20 inch suspension and folding version. So perhaps ICE themselves view their range exactly as you do, two models with slightly different specs. What I didn't realise is the current ICE range also supports the European 700c wheel size...
Thanks for the info admin

Why doesn't it climb as well with 700c wheels?

Thanks admin, that makes prefect sense. I had a similar situation with my Dahon Speed TR folder. That particular bike came from the factory with Schwalbe Big Apples fitted. Unfortunately with me riding these things bounce up and down, wasting energy, so I swapped them for a set of 1.35 section Marathon Plus. The replacement tyres (tires) are a fair bit smaller so things are different; gearing lower and the dynamo hub brighter! The bike no longer bounces and the ride is now what I expect from a quality touring machine...Because the overall wheel size is smaller, these changes have been positive for me. BTW - The Big Apples are great on a trike, possibly the ideal tyre for this kind of machine…Finally please excuse me for being dim, but when using “DF” do you mean a standard diamond frame bicycle?

When I owned my Alex Moulton AM7s, I ran Stelvios on both machines and was very pleased with their performance. But I don’t think I’d want them on my Speed TR and certainly not on my QNT. The Marathon Plus has decent tread (read grip) and, in my experience, provides good puncture protection. The Kevlar bead that runs underneath the tread helps keep most nasty objects away from the tube. I’ve actually pulled thorns from a rear Marathon Plus without getting punctures. That said, a friend has them on his recumbent bike and he recently had two punctures in quick succession. IMHO - Marathon Plus are probably better than other versions of the same tyre...The Big Apple is a very different tyre. Schwalbe call them a “Balloon Tyre” and its easy to understand why. They literally are full of air and very bouncy! Just what you need on a trike where you are not sat directly over the wheels.