Leaked documents reveal that Yamaha is to add an improved, more expensive version of the hugely-popular MT-09 naked bike to its range for 2018. Called the MT-09 SP it will draw on the successful MT-10 SP for inspiration and offer buyers a sportier alternative to the stock MT-09 triple.

Late last year Yamaha revealed the MT-10 SP as a high-spec derivative of its already-impressive, R1-derived MT-10. Featuring the Ohlins semi-active suspension and TFT instruments from the homologation-special R1M, it’s a hefty £2700 more expensive than the normal MT-10 at £13,699. Despite that price, so far this year it’s outsold it’s cheaper sibling in the UK market.

It reflects a trend for buyers of machines in the naked class to opt for higher-specified, more expensive derivatives. In a world where the majority of sales are done using finance, particularly PCP deals, with low interest rates and a focus on monthly payments rather than outright cost, the better bikes are too tempting for many to pass up.

That in mind, the plan for an MT-09 SP makes a lot of sense. Triumph’s three-cylinder rival, the Street Triple, has long sold better in ‘R’ and form than in base spec, and in its latest 765cc form Triumph has added the even spicier RS version to the range. The MT-09 – revamped for 2017 with much improved suspension and aggressive new looks – is as close as you can come to a rival for the base-spec Street Triple 765S. Its power is near-identical; 115PS for the Yamaha, 113PS for the Triumph. Its price is £1 away at £7999 vs £8000.

But Yamaha currently has nothing to rival the £8900 Street Triple R or the £9900 Street Triple RS. That will change when the MT-09 SP is launched.