How safe is a Quest going down hill
How safe is a Quest going down hill around 20-25 mph if you have to make a quick turns to avoid a object or pot hole?
It's more like can you pedal faster than 32 going down hill. It's a safe as any bike at that speed; you don't make quick turn at those speeds you lean; swerve and hope the shock soaks up most of the impact.
In addition, the Quest 559 with its 26 inch wheels may "bridge" potholes better than the Quest 451 with its smaller-sized wheels.