As BMW Motorrad’s best-seller, the R 1200 GS series of adventure/overland motorcycles has been a best-seller for the Munich firm for the last couple of decades. Rumours have arisen the generation GS might see an increase in engine displacement to 1,254 cc from the current 1,170 cc.

For 2019, the GS will be dubbed the R 1250 GS, reports website bikesocial. There will be two flavours of the R 1250 GS, the base model and the R 1250 GS Adventure.

A corresponding increase in power is anticipated, to 136 PS from the current 125 PS, or, in metric terms, exactly 100 kW. It can be assumed that torque numbers will see a similar rise, but no numbers were revealed in the report.

There is also the rumour of variable valve timing, something a lot of bike makers are looking into to increase power and performance while still meeting emissions standards. For the R 1250 GS, spyshots in the wild show a different cylinder head from the current R 1200 GS, lending credence to the rumour.

Weight is reported to have gone up slightly, by 5 kg from the current 244 kg. This can be attributed to a new exhaust system that is five decibels softer than present as well as the rumoured variable valve timing head.

Overall dimensions for the 2019 BMW Motorrad R 1250 GS re not much changed from the R 1200 GS, with wheelbase up slightly from the current model, from 1,500 mm to 1,507 mm, while the Adventure model stays the same. It is expected the new R 1250 GS will have its public reveal at the Intermot show in Germany this October.

GALLERY: 2018 BMW Motorrad R 1200 GS/GSA