If it helps, I have tow Dahons, one mariner, one not.
There is very little difference between the two, they are excellent folding bikes, maybe not the quality of a bike firday, but nowhere near the
price, I have sailed with ours tied to the
rigging and if you take care to prevent rust, then they are fine, but the chain etc is regular
steel and will rust.
For a folding bike a Dahon is an excellent bike