BMW’s spy-shot regulars have caught another prototype wearing an X-shaped headlight and not much else, and this time it’s a midsize GS nobody officially admits exists yet. I’ve already got a Ténéré 700 in the garage I barely ride, and now I’m doing math on a bike that isn’t coming for two more years.

What was spotted

A camouflaged BMW prototype has been photographed testing internationally, and the consensus among spy-shot outlets is that it’s a new midsize GS adventure bike — expected to slot between the F 450 GS and the F 900 GS (which currently sits above the discontinued F 800 GS in the range). The prototype carries a 21-inch front wheel on a cross-spoke rim, a steel bridge frame that reporters say is architecturally closer to the F 900 GS than the smaller F 450 GS, and brake components borrowed from BMW’s bigger GS models.

Design-wise it’s unmistakably a GS: the X-shaped LED headlight straight off the R 1300 GS is there, along with a tall windscreen and protective handguards. What’s missing is BMW’s trademark “beak” front fender — either because the prototype’s bodywork isn’t finished, or because BMW is rethinking the shape for this size class. Development still looks early-stage.

Engine, and where the reports disagree

Every outlet agrees this is a parallel-twin. Beyond that, the picture gets messier. Some reports put displacement at 650-700cc with roughly 80 hp — essentially a warmed-over version of the current F 900 GS platform. Others peg it closer to 585cc and 65-70 hp, floating the idea that BMW is borrowing a reworked version of the engine TVS and Norton co-developed for the Norton Atlas, rather than an in-house unit. Nobody’s confirmed the crankshaft layout either — whether it keeps the F 450 GS’s unusual 135-degree firing order or switches to something closer to the Norton’s 270-degree setup.

Spec Value
Engine Parallel-twin, ~585-700cc (est., disputed)
Power ~65-80 hp (est., disputed)
Front wheel 21in, cross-spoke
Rear wheel 17-18in, cross-spoke (est., disputed)
Frame Steel bridge frame, F 900 GS-derived
Rivals Yamaha Ténéré 700, Honda XL750 Transalp, Aprilia Tuareg 660
Expected launch Not before 2028

That’s a genuinely wide spread for a single bike, which tells you how early this prototype is — BMW hasn’t locked the drivetrain down enough for spy photographers’ sources to agree on it.

Who it’s aimed at, and what it might be called

Every report lands on the same target: the Yamaha Ténéré 700, the Honda XL750 Transalp, and the Aprilia Tuareg 660 — the midsize off-road-capable ADV class BMW currently has no real answer to. It’s the same gap Kove is chasing from the budget end with its 660X, and one report also name-checks KTM’s upcoming 690 Rally as a future rival. That puts this squarely in the segment where BMW has historically had nothing between the small-capacity F 450 GS and BMW’s much bigger dirt-focused flagship GS.

Naming is unsettled too. Options floated include a straightforward “F 600 GS,” a “F 650 GS” continuing the numbering pattern, or a revival of the old “F 650 GS Dakar” badge from BMW’s single-cylinder era. None of that is confirmed — BMW hasn’t said a word officially, which tracks given a prototype this rough usually means a production date years out, not months.

What we know

  • A camouflaged BMW GS prototype has been spotted testing, slotting between the F 450 GS and F 900 GS
  • 21-inch front wheel, cross-spoke design, steel bridge frame closer to F 900 GS architecture
  • X-shaped R 1300 GS-style headlight, but no finished “beak” fender yet
  • Reports consistently put a production launch no earlier than 2028
  • The parallel-twin engine is confirmed; everything else about it is still being argued over

What’s still unclear

  • Exact displacement — reports range from 585cc to 700cc
  • Power output — estimates span 65 hp to 80 hp depending on the source
  • Rear wheel size — 17in or 18in
  • Whether the engine has any real connection to the TVS/Norton Atlas partnership
  • The final model name

None of it is close enough to being real that I’d start saving for one. But a Ténéré 700 rival with an R 1300 GS face is exactly the kind of thing that gets me opening a new tab to check ferry prices to somewhere I’m not actually going this year.

FAQ

When will the new BMW midsize GS launch?

Not before 2028, according to every outlet that’s seen the prototype — it’s still in an early testing phase with unfinished bodywork.

What will it be called?

Unconfirmed. Reports have floated “F 600 GS,” “F 650 GS,” and a revival of the old “F 650 GS Dakar” name.

What engine will it use?

A parallel-twin, but sources disagree on the details — anywhere from 585cc/65hp to 700cc/80hp, with one report suggesting a link to the TVS/Norton Atlas engine.

What will it compete with?

The Yamaha Ténéré 700, Honda XL750 Transalp, and Aprilia Tuareg 660, with KTM’s upcoming 690 Rally mentioned as a future rival too.

Photo: spied by thrustzone.com, photo credited to Motorrad Magazin.