Mystery Triumph Street Triple prototype spied with fairing mount points - suggesting future sporting model

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Triumph may have only just released a new naked Street Triple range for 2023, but these spy shots taken in southern Europe appear to show yet another one in the works.

With its small single headlight and raised bars, you could be mistaken for thinking it’s some sort of semi-retro to line up against the likes of Yamaha’s XSR900, but what’s more likely is the lights have been pinched from existing machines to allow the firm to start development miles.

The headlight, for example, is likely taken from the existing Triumph Trident 660 naked and the raised bars may well be on development clamps and not fixed in their final position.

Headstock and clock bracket for a Triumph Street Triple derived development bike

With the current Street Triple range only a year into its sales cycle, we reckon you’ll be unlikely to see whatever this bike is before 2026, with the main changes seen in the chassis department.

Surrounding what appears to be a largely unaltered Triumph 765cc three-cylinder motor – which currently pumps out 128bhp in RS trim – is a new aluminium twin-spar chassis – complete with a set of lugs toward the headstock that suggest attachment points for a fairing.

This is further supported by the mount for the clocks, which sits low beneath the top yoke – indicating it could be nestled in between clip-ons and behind a nose fairing.

A Triumph Street Triple derived development bike with experimental clocks

Alongside the revised main chassis is a new upswept subframe, with a stacked supersport-style pillion perch likely to offer minimal long distance comfort – and looks to hem the rider in quite tightly against the fuel tank.

Given the colour, shape and decals of said tank, the test mule uses the 15-litre unit from the current Street Triple RS.

The other addition is the chunky swingarm, which bears no resemblance to the banana-style set-up seen on production machinery and looks more like a racing design found on a Moto2 bike (a class that uses this Triumph engine platform).

A Triumph Street Triple derived development bike with a thicker swingarm

Mystery Street Triple explored:

  • Long way to go This might look like no Triumph Street Triple you’ve seen before, and that’s because it’s a long way off being finished. We wouldn’t expect to see anything before 2026.
  • Rear of the year The swingarm and five-spoke rear rim suggest a racier, track-focused stance – as do the Pirelli Supercorsa tyres.
  • Piping up This bike has lost the low-slung exhaust from the current Street Triple range. This is likely to be due to testing, as well as the different swingarm causing fitment issues.
  • Snug position Although it’s hard to gauge how tall the rider is, the riding position does look to be quite compact and focused, with things likely to be quite intimate with a pillion on board.
  • Stiffer Striple Should this bike be a sportier version of the Street Triple, it’s possible that the new frame is stiffer for greater track prowess.