UKH

What kind of trainers do you buy for scrambling and running in one day? Say if you wanted to scramble up tryfan but then run a bit afterwards? 

I have some Ascis trail running shoes which are great in the mud and super comfy but as soon as you step onto rock they are dangerously slippy! I wouldn’t dare try scrambling in them. 

Thanks all!! 

I have some Boreal Saurus that would do the job well. They're essentially a pure trail running shoe but the rubber used on the sole is pretty effective on rock. Couldn't edge for toffee in them though, so definitely not for anything more technical than mild scrambling.

Hmm, good question. I've run the Snowdon Horseshoe, Tryfan N Ridge and similar in regular fell shoes (Inov-8 X-Claws and X-Talons) and they were fine. I'd call it running with a bit of scrambling chucked in though. Anything too stud-y is generally rubbish on damp rock. I did once get off route on Sharp Edge (takes skills to get off route on a ridge) and find myself feeling horribly precarious on mossy, shelvy rock. Don't think I'd want to run in anything too rock-biased though.

I have found La Sportiva Bushido to be quite good for that of thing. Done lots of running plus some scrambling in them. Not tried them on any climbing routes but they were perfect for the Inn pinn, Curved Ridge, Aonach Eagach, Liathach etc.

To state the obvious, shoes that specialise too far towards either running or scrambling are going to be less good for both. The best all-rounder that I've used is the Bushido, as someone else said:

https://www.ukhillwalking.com/gear/footwear/running_shoes/trail_running_sho...

There may well be other makes and models that offer something similar too. I've scrambled in them a lot,  and done a lot of running and walking too. I would stop short of roped climbing ground because they're not very edgey or precise feeling at the toe. At that stage I'd be looking at more climb-oriented approach shoes, but then I probably wouldn't be combining those routes with running in the same way as you can do with easier scrambling.

That said, if you're only talking grade 1 hillwalker's scrambles like Tryfan north ridge then pretty much any decent fell or trail shoe ought to do - in the dry.