I'm running Schwalbe Marathon Winter 208's in a 29 x 2.00 on my Surly Ogre, with fenders. Other than being a challenge to install, these have been great the last three winters.
Thanks guys, I ended up getting a 2020 Rondo Ruut AL1, this years model has bigger tyre clearance (the frame is very different to the Rag+ now) so although it still can't fit a 29x2.25 ice spiker in the back it should fit a 27.5 one. They also have a new model called the Bogan which looks pretty cool and should fit 29x2.25, but it is only available in steel at the moment and I'm pretty heavy so never been a fan of the BB flex on steel frames, It is this reason I didn't find a drop bar mountain bike that suited, they are either steel or carbon and out of my budget.
Plus Oslo Sportslager had the Ruut in stock ready to go so I got to support a local shop and it looks swweeet in the flesh 🙂