Cheers Andy - the 40th Anniversary spec which they replicated across the rest of their range. https://www.bmw-motorrad.co.uk/en/ex...-years-gs.html
It's an uncanny combination of the Paralever which prevents the swingarm geometry changes under acceleration and allows you to get on the throttle really early in bends, plus the Telelever which provides stability and irons out bump-steer on corner entry. Combined with more torque low down than most other bikes, and it's an effective combination to make progress. Low CoG from the Boxer is advantageous at low speeds plus whenever someone on another bike complains about bikes being top-heavy when fueled. What it lacks is the top end HP from higher revving motors, but it is only at track-only speeds that the HP advantage becomes clear. Everywhere else, the chassis enables you to make the most of the torque. Certainly be willing to give one a try... and I would recommend asking your dealer if they can loan you one over a weekend. The GS does take some re-adjustment in riding style when coming straight from a more regular bike in order to get the best out of its format.
Thanks for the detail. On my R, sitting at 70mph was about 500rpm less than on the GS. This was a noticeable drop, but still allowed rapid overtakes at speed. If the RT is another 300rpm or so lower, that would be quite a bit of a drop and may simply demand a gear lower to maintain the same levels of acceleration. Not a hardship by any imagination, and perhaps good for higher speed manoeuvres at maybe the expense of lower speed snappyness that make the GS feel like a giant supermoto.