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All forks and shocks have a 100hr service interval now; they are complicated devices with many critical tolerance fits and seals. I'm sure most of them can go on far longer, but if there is something up with them, the chances of doing irreparable damage increases the longer you run it.
shops advertise these things to parents as zero maintenance
Do they do this? I'd hope they don't do this, given how complex these things are becoming.
Howard-
I can not speak for every shop in the world but speaking to to people where I am this is often how it happens. "get the enviolo or rholoff so there is nothing to maintain and a belt drive so there is nothing to check for years" Then something explodes and leaves them stranded. See these things getting towed on flatbeds or just being abandoned when they fail. I guess its the problem often times of new parents wandering in to buy the most safe and comfortable option possible for their little Kanzler that they can ignore except charging. Often times people are used to their city bikes that they never did any maintenance on and assume a 7000Eurobuck cargo bike thats fully integrated with electric everything must be even easier then that. IF not what are you paying for?
young_gun
I mean even considering short commutes thats like 3x fork services a year. That is pretty wild considering shops advertise these things to parents as zero maintenance (cargo bikes in general)