Is this a good step up from a 20-inch kids' bike?

Yes. The 24-inch wheels and 7-speed drivetrain suit a child who has outgrown a 20-inch single-speed and is ready to shift gears on hills and longer rides.

Are the disc brakes better than rim brakes?

Mechanical disc brakes keep more stopping power in wet or muddy conditions than rim brakes. They do need occasional cable tension adjustment as pads wear.

Can it handle dirt and gravel paths?

The 24 x 2.10 tires and aluminum frame handle packed dirt, gravel and light trails well. There is no suspension fork, so very rough ground will feel firm.

What is included with the bike?

The bike comes with reflectors. The listed parts are the aluminum frame and fork, KMC chain, Shimano 7-speed grip shift, mechanical disc brakes and 24 x 2.10 tires.