BMW's Mini brand will show what is possibly a final 'limited edition' model line called Sidewalk at the Detroit motor show next month.

Although the hatchback version has had a full redesign recently, the convertibles are still 'old model' and there has been no announcement about when they'll be replaced.

The Sidewalk option pack for the One, Cooper and Cooper S includes a choice of four paint colours, malt brown English leather upholstery, 17" 'night spoke' alloy wheels, bi-colour leather steering wheel and gear knob and special interior trim, floor mats, badges and door inserts.

Also included are normally optional items such as automatic stability control and traction (ASC+T), multifunction leather steering wheel, body colour mirror caps, chromed interior, passenger seat height adjustment, sports seats, storage compartment pack, front fog lamps, manual air conditioning, on board computer, interior light pack and clear indicators.

BMW said the additional gear specified as individual options would cost about 25% more.