@root – tyres are from r2-bike in Germany- worked out about £50 each with postage. Very pleased so far – roll fast and give good traction on most surfaces I ride on. These tend to be local lanes, bridle ways and tracks – no tried in mud, but would switch back to the other wheels and WTB nanos for that. Alpkit have a good range of WTB tyres, just not the Byways (at least when I was buying).
@ilfer – wheels seem fine so far – I needed to swap the front axle end caps to go from 15mm to 12mm but all straightforward. Bit of pinging on the first ride, but settled down and seem solid since then. Afraid I didn’t weigh them – if I get a chance I’ll weigh the complete wheels which would provide an indication. I’ll also have a look at clearance, but I think from earlier posts I’ll have more in the 2017 frame than earlier years, so might not be helpful! I think Jameso has addressed this above or elsewhere though.