A bike tour in Brussels is a solid way to see the city if you like being on two wheels. Expect a mix of smooth cycle paths through the historic center, some cobbled streets that rattle your teeth, and a fair bit of traffic once you leave the main tourist zones. You'll cover the Grand Place, EU district, cool street art areas, and a few parks in 2–4 hours. It's not hugely strenuous but you won't be coasting the whole time—Brussels has gentle hills. Most groups are small and move at a relaxed pace.
The best time is April–June or September–early October when the weather is mild and the city isn't too crowded. Summers can be hot and sticky; winters are cold, wet, and occasionally icy. Expect to pay around €35–65 per person for a standard half-day group tour including bike rental. Private tours or e-bike options push toward the higher end.
Pick a tour that includes the less obvious neighborhoods like Ixelles or the canal area if you want to see more than just the tourist center. Skip anything that promises to visit five different beer halls in three hours—it's mostly marketing and you'll end up rushed and wobbly. Bring a small backpack with water and layers; wearing comfortable shoes makes a bigger difference than you'd think.