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Photo: Brant Ward / The Chronicle Image 1 of / 5 Caption Close Image 2 of 5 UberX drivers including Ramsey Reguii (center) challenged Uber officials about the new fees during a rally and strike. UberX drivers including Ramsey Reguii (center) challenged Uber officials about the new fees during a rally and strike. Photo: Brant Ward / The Chronicle Image 3 of 5 Uber official Brian Tolkin (left) tried to explain the reasons for the rate hikes to driver Zen Mohamed (center) during the rally and strike. Uber official Brian Tolkin (left) tried to explain the reasons for the rate hikes to driver Zen Mohamed (center) during the rally and strike. Photo: Brant Ward / The Chronicle Image 4 of 5 UberX driver Mahdi Ghamgui (center) made a point to an Uber official during the rally. UberX driver Mahdi Ghamgui (center) made a point to an Uber official during the rally. Photo: Brant Ward / The Chronicle Image 5 of 5 Uber drivers protest on Mission Street 1 / 5 Back to Gallery

A group of UberX drivers angrily confronted company executives Thursday at Uber headquarters on Mission Street in San Francisco over rising commissions.

Drivers for the app-based car service rallied against Uber’s decision to increase the amount of money it takes from each fare from 15 percent to 20 percent. The protesters say the higher commission rates, combined with a new smartphone fee, drains income from their pockets.

As Uber continues its rapid expansion, the company has been trying to find a balance between generating profits and courting drivers, whose customer referrals are crucial for Uber to win market share.

The company defends the hikes as necessary to offset the cost of price cuts it implemented over the winter in its ongoing battle against competitors like Lyft and Sidecar.