the issue is when you need to physically manipulate the throttle butterflies to maintain a set speed - it needs a module that can appropriately pull / relax on an extension of the throttle cable (which is the bulky thing on an old RT hiding in huge spaces under the faring panels). The air cooled GS has less room, but you can get one to fit where the little tool tray is under the riders seat - but needs a tight right angle curve, for likely a longer cable - Sadly it won't fit in the right side petrol tank cutout of the 36 litre GSA's (close but the forks will hit when moving the steering).
with the need to modulate the throttle automatically for noise and emission regs (and bringing marketing BS of the pathetic rider power modes) - most vehicles designed later than the first 1200GS's, went to nasty fly-by wire throttle control and on these adding cruise is a simple as adding the switch and kicking the software (as most of the rest of whats required is already in place). Hex GS911 in the March 2026 software release just added the retrofit option - to add cruise on the LC bikes....
Just been riding a 2026 RNineT that has flyby wire throttle and cruise. By some magic once fully warm they have really got the fueling of the TC engine sorted in ways that will seem remarkable to the 2010 GS boys - no cough, no glitches and a far wider spread of power.
However, there's some wild stuff going on as it warms up from a cold start - revs to 3k for at least 2 mins from start up - and as I presume an emission related rapid warm up of the CATS / Engine, and with flyby wire - if you try to ride before it gets over itself, it's revs that win and it tries to rip down the road not so clever, getting out of parking spaces or straight in to traffic. It also needs 10 mine before its warm enough to hit hot engine fueling / behaviors - till then its weird in traffic and you start to wonder if you imagined they'd got it right. But once warm you find they really did.
How they got the thing to make so much bottom end grunt is also remarkable - yet still revs hard to 9K. Once you ride this later iteration of a TC air cooled engine you wonder why they ever bothered with the Liquid cooled bikes. Its not perfect, "Dynamic" is required to run properly after 2500 RPM, but round town in traffic "Road" behaves far more eloquently off a closed throttle. It would be much better to ditch both and merge into one normal mode like bikes used to have...
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