Most tyre clearance
Which frames take the biggest rubber?
How this is ranked
Manufacturer's stated maximum tyre width.
Clearance is comfort and traction on rough surface, but loaded it's also seat-pack clearance — a big tyre and a swinging seat pack compete for the same space. Frames with headroom here give you both options.
Every figure comes from the manufacturer's published geometry — see each bike's page for the source. Nothing here is a judgement about how a bike rides; it's one measurable property, ranked. Disagree with the criterion and the order changes, which is the point.
The ranking
Other ways to rank these bikes
Which frames swallow the biggest full-frame bag?
Best bag space on a small frameIf you ride a small frame, which bikes don't punish you on carrying capacity?
Most stable under loadWhich frames stay planted with weight on them?
Best set up for cargo out of the boxWhich frames let you bolt things on without straps and improvisation?