Thanks for all your replies. I have mudguards (fenders) on my Delite, so I will have to go with as close to 2.35 (inches I presume?) as possible. I've found some
Schwalbe Smart Sams online for £17.99 each which I'm happy with. They are 27.5 × 2.25 inches wide. Will the 0.1 inch difference in width make a difference?
The rims are Alex rims MD40 584 · 40. Can someone please explain how the width of the actual rim (40?) relates to the tyre width (2.35 etc)? Thanks.
PS Just to clarify. My commutes MOSTLY is on public roads. This is mostly tarmac. However, recently I have had to travel on one or two roads that are covered in gravel (the contractors put down loose gravel and rely on the cars to compact it into the substrate of the road. I also have to use a pavement with wet slippery mud and leaves on it.
Can the Schwalbe Super Moto-x handle the mud and gravel and will it last longer than the Smart Sams. The Moto-x is £6 more expensive but seems more popular and would have lower rolling resistance. I don't do any significant off-road riding (only mixed pedestrian/cycle paths and public roads in the UK).