A bicycle handlebar with integrated gear shifters is commonly known as a combination or integrated shifter. These handlebars are designed to incorporate the gear shifters directly into the handlebar setup. There are a few common types:

Drop Bars with Integrated Shifters:

Drop handlebars are often found on road bikes. Some road bike models come with integrated shifters, commonly known as STI (Shimano Total Integration) or DoubleTap (for SRAM).These shifters are located on the brake levers, allowing the rider to shift gears without moving their hands from the brake hoods or drops.Flat Bars with Integrated Shifters:

Flat handlebars, commonly found on mountain bikes and hybrid bikes, can also have integrated shifters.Integrated shifters for flat bars are often referred to as trigger shifters or Rapidfire shifters. They are mounted on the handlebar and can be operated with the thumb or index finger.Twist Grip Shifters:

Twist grip shifters are another type of integrated shifter, where the gear shifting mechanism is integrated into the handlebar grips.By twisting the grip, the rider can shift gears without taking their hands off the handlebars.Bullhorns with Integrated Shifters:

Bullhorn handlebars, which have a straight middle section and forward-curving extensions, can also be equipped with integrated shifters.The placement of these shifters may vary, but they are designed for easy access while riding in the bullhorn position.The choice of handlebar with integrated shifters often depends on the type of bike and the rider's preferences. Road bikes tend to have drop bars with integrated shifters for a more aerodynamic riding position, while mountain bikes and hybrid bikes might have flat bars or bullhorns with integrated shifters for a more upright riding position.