Normally when you buy a bike it comes with some cheap heavy tubes. But not Trek Remedy. On my Remedy 9 I got Maxxis Super Thin tubes, feels a bit wrong on a AM bike but seems working well😉
So around 140g for a 27,5″ tube for 1,9-2,35″ tires. Maxxis WelterWeight tubes are around 190g for comparsion.
But the best would be to stans the tires instead of using tubes.