I can't really climb steep hills with 28 gear inches on the road, let alone on singletrack. But yes, your gear ratio is suitable for road. My all-road bike has

I can't really climb steep hills with 28 gear inches on the road, let alone on singletrack. But yes, your gear ratio is suitable for road. My all-road bike has 23 (30/34·26.5", 650bx45 wheels). I don't race.