ZeroEm said:
Don't know how many miles you get out of a set of front tires/tyres.
My front wheels on the KMX are cambered 3 degrees, which puts the surface in contact with the road slightly off center. I use Schwalbe Marathon Greenguard 406x40 on the front wheels and a Schwalbe Marathon Plus Tour 559x40 on the rear.
I get about 4,000-5,000 miles out of a set of front tires, factoring in that I rotate them every 1,000 miles or so. The front tires are at the end of their life when a small number of cracks and gashes develop in the tires(usually less than 5) that are large enough to expose the greenguard layer and/or if the cracks spread to the sidewall, which then makes them prone to puncture and failure, and often they are in this end-life state while the rest of the tread still looks new. I have to change them in spite of still looking good when the few cracks/gashes are ignored, because they start getting flat too frequently at this stage, every 100-200 miles or so. Before they get to this point, flats simply don't happen with them(one exception was when I hit a 1" nail at 40 mph with only 1,000 miles on the tire, but a new tube rendered the tire still usable to its normal end of life).
The rear tire has over 45,000 miles on it and the tread is still good with no cracks or gashes and I'm liable to get another 10,000-20,000 miles out of it. I've been using the same rear tire for almost 3 years. I'm very satisfied with it. I have a Schwalbe Marathon Supreme 559x52 with over 10,000 miles on it that still looks brand new and never had a flat rear while I used it, but I swapped it out because it had terrible traction in the rain and I'd have to get out of the velomobile and drag it onto a sidewalk and uphill from a stop because I couldn't get sufficient traction to go forward when trying to pedal it on slick ground, and the trike was unmotorized then.
Out of all the front tires I've tried on the KMX, the Marathon Greenguard have given me the longest life AND the lowest rolling resistance. I've also tried Maxxis Hookworms and Schwalbe Trykers, neither of which were as long lasting or as efficient. I can't tell if the Marathon Plus Tour or the Marathon Supreme is the longer lasting tire for the rear because neither have ever been worn out. The Marathon Supreme definitely rolls more efficiently than the Marathon Plus Tour, but has no traction in inclement weather(do consider I have very little weight on the rear wheel), but the Marathon Plus Tour has adequate traction even riding in the snow provided the snow is not higher than about 2".
The Milan has a new set of Continental Contact Urban 406x32 on the front, and a used/worn Continental Grand Prix 559x28 in the rear. The rear will soon be replaced with a Marathon Greenguard 559x40 I have on hand if it will fit, and if it doesn't, I'm getting a Continental Contact Urban 559x32 for it.