What are your trails like? What's the riding like? The 2.5 isn't a ton heavier, but it's a lot bigger, and a lot slower.
I'm digging the 2.35 Minion DHF in back and Nevegal 2.35 DTC up front. The Minion is slightly narrower, rolls a bit faster, and I actually like it better than the Nev for the back. Especially set up tubeless in the back. Light, grippy, burly enough for a lot of bashing around, no pinch flats. That's on the pedaly trail bike. The 2.5 DH versions of the same tires and the same setup are on the DH bike.
As an in between, I've really liked the 2.35 Intense tire lineup. Still big, heavier, grippy, but not quite as slow as the 2.5 Nev. And a hell of a lot cheaper.
I've got the 2.35 stick-e's front and back on my freeride bike and they're certainly enough rubber for me. I came off 2.35 highrollers that were WAY narrower and less grippy (but granted, they also had less tread remaining). I love the 'gals. I had a set of 2.5s nevegals on my old FR bike, and they were similarly grippy, but much larger and slower. If you want to pedal around trails at all, I'd go with the 2.35s.
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