Bottom part of Page 22 of the sales brochure Issue 20, Fall 2012 lists the weight capacity based on frame size. Other versions of the sales brochure might have this on a different page.
I do not recall where on the internet the sales brochures are. Someone might see this comment and respond.
I would not worry about 275 pounds. I probably had a bit over that in the photo attached, I am roughly 180 pounds and probably had a bit over 100 pounds of gear on the bike at the time of the photo.
I believe that the weight capacities listed in the brochure are the load, excluding the weight of the rider. My size frame at 590M is listed at 62kg with 20 kg in front panniers, 3kg in handlebar bag, rear panniers and three water bottle cages.
At your weight you would be over the 100kg chainring to sprocket size ratio. I assume you already knew that, but if not, I thought I should mention it.
That is covered at this link:
https://www.rohloff.de/en/service/handbook/speedhub/technical-data#c25679Under the topic of "Smallest Permissible Sprocket Ratios (solo 100kg)"
I pasted this from that web page:
The following sprocket ratios must not be undercut if the SPEEDHUB is used by a rider weighing more than 100kg, or mounted on a tandem application: 53:21, 48:19, 45:18, 42:17, 40:16, 38:15
This equates to a transmission factor of 2.50.ADDENDUM:
I took another look at the brochure, on page 21 in lower right corner it said (pasted):
Luggage capacity.
In the matrix on page 22, I give
absolute maximum luggage
capacities for each size, please note
that, I have assumed that 20Kg would
be carried at the front. 20Kg is the
maximum load for the fork; whilst it
is safe to ride with 20Kg on the forks,
I wouldn’t want to do it day after day!
In the text on this page, I give lower
maximum figures, these are based on
only carrying 10kg on the fork.
The bikes are so much nicer to ride
with just 10Kg on the fork.
They are even nicer to ride if 10Kg
15Kg less is carried at the back.
Doesn’t that sound enough tom you?
Please consider that many cyclists
overestimate how much weight they
actually carry, or need to carry.
Having the capability of adding up to
25Kg to your load, allows you to carry
up to 25 litres of extra water if you
have to climb out of the Atacama,
cross the Nullarbor, or pedal through
water-bourn disease affected areas.So, it is clear that the values in the table on page 22 are for luggage capacities, thus exclude weight of bike and rider.