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"tradesman with tools in a van"
Is only broadly plausible as the likes of Toolstation/Screwfix/ your good local builders' merchant has on-shelf of 'everything', (within reason).
Bike mechanic in van has increasingly fewer stockists to call on. Out here in outer north west London the only new stockist of bike components is the nearly year old Decathlon in the Intu shopping centre, (with chargeable parking). Fine for those wanting replacement HG 7/8/9 speed cassettes, but nothing better on the shelf. -
I was surprised to discover that this does exist - a wealthy acquaintance with a ridiculously flashy mtb (which he rides once a year, on a foreign trip with other, similarly moneyed, once-a-year mtb enthusiasts) casually informed me that "the man" would be coming over to see to his steed. I considered suggesting that he could probably pump up his own tyres, but thought better of it.
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This is essentially what Bikenation do in South London. They're at East Dulwich market and then go in a van to you to fix your bike. Minimum charge of £25 a job.
I think the future for bike mechanics has to be the self-employed "tradesman with tools in a van" model like for every other thing in your house or garden you pay people to get fixed.
Bring my bike to you? Fuck off it's not a car.