maintenance of a bicycle: man using gloves removing the cassette of a bike wheel

sprocket cog bicycle cassette cogset wheel bike workshop tool remove repair maintenance person mechanic repairman assemble hands unrecognizable key technician service transport transportation work disassemble fix unknown copy space worker cycle adjust bicycling remover business serviceman detail real people mechanism set man workplace shop copyspace vehicle assembly gear selective focus gloves adult bicycle: using removing protective his shop concept: small owner