What types of bikes are there?
There are gravel bikes, road bikes, mountain bikes, BMX bikes, recumbent bikes, unicycles, hybrid bikes, electric bikes, cruiser bikes, trail bikes, CX bikes, enduro bikes, touring bikes, fixed gear bikes, kids bikes, fat bikes, tandem bikes, folding bikes, trikes and low rider bikes.
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(Optional) Context information is below.
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Answer the following query.
What types of bikes are there?

user
There are gravel bikes, road bikes, mountain bikes, BMX bikes, recumbent bikes, unicycles, hybrid bikes, electric bikes, cruiser bikes, trail bikes, CX bikes, enduro bikes, touring bikes, fixed gear bikes, kids bikes, fat bikes, tandem bikes, folding bikes, trikes and low rider bikes.
assistant