I’ve not seen one …

just some more catalog pictures showing the Univega Shockblok
Univega shockbloc aus catalog 93.jpg
Univega shockbloc aus catalog 92.jpg

I have never seen one in real, but also not a single test of one in a bike magazine etc.

Sure, the Univega marketing team said in this Ad "it's all true" so it must have been there ;)
Univega shockblok Ad 1992.jpg
 
I remember seeing a two wheel drive mtb in the 90s in some american mag. If memory serves, it had some kind of cable running to the front wheel to provide the drive. I don't expect to ever see one in real life.
 
I remember seeing a two wheel drive mtb in the 90s in some american mag. If memory serves, it had some kind of cable running to the front wheel to provide the drive. I don't expect to ever see one in real life.
actually those 2WD bikes had been indeed sold.

The most popular was the one also sold under the Subaru brand.
subaru 2wd-dual-power-2798425.jpg
This is using belts.
There is currently an offer at the marketplace in Germany:
https://www.ebay-kleinanzeigen.de/s...o-gear-sowie-titan-unikat/1935561774-217-6813
There is another variant with a flexible drive shaft, called DWA 2WD

That means, yes, those bikes had been build and commercially available. Just the concept or idea behind it wasn't convincing, i would expect that a lot of energy is killed senselessly for driving a the second wheel too.
 

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