This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of biker.

n. originally a British youth subculture that evolved out of the teddy boys in the 1960s; wore black leather jackets and jeans and boots; had greased hair and rode motorcycles and listened to rock'n'roll; were largely unskilled manual laborers

"We had a brief encounter with three moutain bikers from the UK."

youth subculture   

hikers    pikers    strikers   

biker    cyclist    triathlete    jogger    hackers    goon    loggers    dominatrix    riffraff    screenwriter