A few recent releases look like they have really large downtubes - like the new Giant Reign, though in @Rob Rides EMTB new pictures it doesn't look as bad as Giant's pictures.
So measure and list your downtube girth... I'm stuck somewhere without bikes so can't add any at the moment.
If you don't have a flexy tape measure, use a piece of string or sheet of paper wrapped around, mark it, measure it. Might have to go corner to corner rather than edge to edge if you have particularly large girth - that should give you at least an extra 6cm's ! (of measuring space....)
So measure and list your downtube girth... I'm stuck somewhere without bikes so can't add any at the moment.
If you don't have a flexy tape measure, use a piece of string or sheet of paper wrapped around, mark it, measure it. Might have to go corner to corner rather than edge to edge if you have particularly large girth - that should give you at least an extra 6cm's ! (of measuring space....)