I'm not a fan of Marathon Racers as the ones I had delivered with my second trike got three punctures in 500 miles so I swapped them for Marathons (normal ones, not Plus). I have since tried Panaracer Minits Tough (not tough enough) and Kojaks (fast but not very comfy) as well as Big Apple (hard to get to sit on the rims well but good once one). But I keep coming back to normal Marathons. I get about one puncture per 3000 miles which is OK (although none with them on either bike since I have moved to Germany where you don't get hedges or flints so much).