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£1500 Bullitt (it's in Scotland)
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Ah I see.
Bosch's stated policy is they support systems for 7yrs after they've been discontinued, but Gen2 has only recently been discontinued so we'll see how it pans out.
They did release a pretty in-depth service kit for Gen2 DUs that looks pretty promising. It's about $125USD retail and replaces most of the internals as well as the entire drive side of the DU including the chainring splines and lockring threads. I haven't done one yet, but looking at the procedure, my guess is it'd take about 60-90min to perform a DU overhaul.
As far as upgrading aftermarket, the biggest issue is that Bosch doesn't generally sell DUs unless they're a replacement for an existing one. So upgrading to a completely different DU isn't really an option.
But assuming you could get a DU, Gen4 is it's own standard, but the frame fitting for Gen2 and Gen3 DUs are the same. The latter uses a standard chainring however and a lot of the bikes we've seen transition between model years have had their frame designs altered to accommodate this, so an upgrade from Gen2 to Gen3 isn't always possible due to chainring clearance issues.
We did see an interesting adapter on a Moustache tandem that allowed them to fit a Gen4 DU to a Gen2/3 frame that was pretty neat, but it doesn't appear to be available aftermarket...
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Hmmm quite close to my parents house! Seems like a really good price but I haven’t been keeping abreast of prices…
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There are third parties that repair and sell bosch motors too - so I imagine unofficial support will continue much longer than that. I used to send all our broken motors that hadn’t been replaced on warranty to them, get them all back super clean and in perfect working order. Great service!
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Yeah, most of the parameters of a given DU are programmed by the OEM and can't be changed even in the dealer diagnostic software.
:EDIT: Was on the phone with Bosch tech support this morning following up on a case and I decided to ask about those Ebay DUs. They said there's no legitimate channel for buying new DUs in any sort of meaningful quantity for resale, so assuming they're even real, they're either defective units that were fished out the trash, refurbished used units, or were ripped out of stolen bikes.
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In practice it basically has no effect on the assistance and top speed (guys that were repairing my DUnits said so)- but may have an impact on other metrics?
The one little hack they said you could do with gen2 is put it in emtb mode and set the crank length to 165mm or shorter. The DU gives you a little extra torque to compensate for the short crank
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The customer-facing adjustment does seem kind of moot, but we ran into at least one instance where a 27.5" bike was getting incorrect speed readings and hitting cap prematurely because the DU was one the customer had cannibalized from their wrecked Edgerunner.
I hadn't heard of that EMTB trick, ha!
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The way bosch warranties work is you submit your old motor for them to collect, then they give you a replacement shortly after. They don’t let you keep the old one.
Although in practice there was a period of time where didn’t collect 100% of the time, so I accumulated a few broken motors, and sent them all off to be repaired by a third party and kept them as spares.
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Not sure why a child would need a cargo bike but this is ace
sacredhart
JVBulman
Jackytwoshoes
c.h.e.
MCamb
PC2
young_gun
Chaley
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@mdizzle
FTFY