I got a flat yesterday while riding a tech trail. I was running Kenda Freeride tubes. With my saint stuff, it's a pain in the ass to take the rear wheel off. I don't want to run full on DH tubes, because I ride trails and DH on this bike. I still need to be able to grind up long climbs. Can any recommend a good FR tube, something under 400grams, but still burly enough to avoid pinch flats. Oh I have mavic 729 rims and run kenda sticky 2.6 tires.