I'm looking to access some of the tow paths around London's canals and rivers. The best/furthest reaches do rely on grass, sand and gravel footpaths. Also similar further out in surrounding counties, in forest paths, farm drives etc. I don't want to be just confined to tarmac. I just feel the 16" wheel don't really cut it.
Yeah the Brompton narrower 16" do OK on hard pack, but Big Apple 20" has the advantage as the ground gets softer/looser/bumpier.