In return, I’d suggest for your tandem Velocity Cliffhanger or Atlas.
Velocity is spendy! If that s the only solution, I will try to run the keba confrérie, they should be ok on roads. On the narrow side with 42 tyres.
SJS do an own brand/no name 650b, reviews are ok. And very reasonable £.
... 32h only.
@Midi started
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In return, I’d suggest for your tandem Velocity Cliffhanger or Atlas.