My e-tandem looks more cruiser-based than MTB-based, yet is based on a bonafide downhill MTB.
The main frame is a shortened GT Quatrefoil MTB tandem but is a full-bouncer thanks to a GT STS rear frame and 140mm air forks. It also has disc brakes and there's no huge handlebars, so it's amazing what a set of cruiser fenders and tyres can do!
On the tandem i've used 50mm wide supermoto rims but it wasn't always a tandem - it's previous incarnation was as a GT LTS-3 and that ran 19mm rims...
They evolved from my old manual Merlin, which was every bit a cross between a cruiser and an MTB, though it was a woman's road bike when i bought it!
