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In page Bicycle brake:
"The roller cam design was first developed by Charlie Cunningham[1] of WTB around 1982 and licensed to Suntour.[citation needed] Roller cam brakes were used on early mountain bikes in the 1980s and into the 1990s, mounted to the fork blades and seat stays in the standard locations, as well as below the chain stays for improved stiffness as they do not protrude to interfere with the crank. It is not unusual for a bicycle to have a single roller cam brake (or U-brake) combined with another type. They are still used on some BMX and recumbent bicycles.[2]
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