The Isle of Man TT will run with Sportbike machinery alone from 2027, completing a change that began in 2024. Supertwin-specification motorcycles will therefore disappear from the schedule for the first time since 2012. The decision shifts the class towards a format the organisers say is more sustainable and more closely connected to the wider production-racing landscape.

Sportbikes joined the 2026 TT alongside the established Supertwins as part of the phased introduction. In the only Sportbike race held that year, Dominic Herbertson was the category’s leading rider, taking seventh place in the combined results.

The case for the new rule set

The TT identifies three reasons for the change: sustainability, parity and stronger manufacturer engagement. Compared with the Supertwins, Sportbike machines operate under tighter regulations intended to reduce construction and running expenditure for both teams and private entrants. The category also uses a Balance of Performance system. According to the organisers, that system has a proven record of producing close racing between different motorcycles and brands.

For 2027, the Sportbike technical package will match the requirements used by the UK National Sportbike Championship. The TT is a road race rather than a circuit event, so a limited number of TT-specific modifications will be permitted. The organisers say this follows the same broad approach already used for the Superstock class.

The TT says that technical parity and commercial relevance have attracted significant interest from major motorcycle manufacturers, with several becoming directly involved with teams and the category. Ed Wilson, Head of Sport for the Isle of Man TT Races, described full adoption of the Sportbike regulations as a logical next step. In his view, the format offers a more relevant and sustainable platform, connects the TT with championships elsewhere and gives younger riders a clearer route to the Mountain Course. It also responds to the specialist development and rising participation costs that had become a concern within Supertwin racing.