2018 Mercedes-Benz GLB crossover

The Mercedes-Benz GLB is set to become the latest addition to the manufacturer’s SUV line-up after a test mule was spotted.

Mercedes is yet to officially confirm the model, but a production version is likely to sit above the GLA crossover and below the larger GLC SUV in terms of size.

The GLB, which is unlikely to launch before 2018, is a relation of the B-Class MPV, but is likely to sit on the same platform as the A-Class hatchback and GLA crossover.

This means front-wheel drive is likely to be standard on most models, with all-wheel drive an option on top-spec cars, while a similar engine line-up to the GLA is also expected.

The GLB would be a more spacious and practical SUV than the GLA, but would lie in quite a niche market with no direct premium rivals. Crossovers like the Audi Q3 and BMW X1 are more natural rivals for the smaller, style-focused GLA, while the Audi Q5 and BMW X3 rival the GLC SUV.

Mercedes' SUV line-up already includes the G-Class, GLE and GLS alongside the GLA and GLC.

Source: autocar.co.uk