Brompton Train: made me think of Jack's audioboo last year for the Bike Show. There's definitely a distinctive 'whir' that the Bromptons add to the aural mix. I suspect it is the two little roller wheels humming along at the same time.
@Matt started
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Brompton Train: made me think of Jack's audioboo last year for the Bike Show. There's definitely a distinctive 'whir' that the Bromptons add to the aural mix. I suspect it is the two little roller wheels humming along at the same time.