I've had great success using the 26" Performance Brand Ultra lites (110gms) tubes 1.7-1.9 in a 2.1 Maxxis Ignitor 29. I recommend using a lot of talc powder and run them at or around 36-40psi. I think if you planned on running less air pressure, these would be more like to get a pinch flat. I do keep a 29" Ultra Light Salsa tube as a spare as well as slime "scabs" which also work well in the event you need to do a quick patch.
Before I switched over to tubeless, I had pretty good luck using the Slime, 26" tubes. The only problem I had, was not letting all of the air out of the tube, before placing the last section of bead, over the rim. If I left air in the tube, I always pinched it, when snapping the leas little bit of tire on.
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