UK bicycle brand Ridgeback has issued a safety recall for a number of its hybrid bikes sold since 2020. The recall affects the Comet, Motion and Speed bikes with sloping geometry or a step-through frame and with the product code prefix RB21.Theres a detailed list of affected bike models, along with their product codes, accessible via a link on Ridgebacks site.Ridgeback has identified a possible problem with the Vee Zilent tyres fitted to some bikes, due to a manufacturing defect in the tread pattern. It says this could cause the tyre to fail, with the risk of a crash. Defective Vee Zilent tyres could split along a line just off-centre. Its recall notice shows a pair of tyres where the tread has split from the fabric casing below it, just off-centre. Ridgeback asks customers who are potentially affected to inflate their tyres to the recommended pressure and check the straight treads either side of the tyres centre line. Above is an unaffected tyre with straight grooves either side of the centre line. It claims it will be very clear if you have an affected tyre or tyres on your bike and says if the tread and seams are uniform, your bike is not affected and you can keep riding it.What to do if you think your bike is affected The Ridgeback Speed is one of three bike models affected by the recall. Russell Burton / Immediate Media If, on the other hand, theres a potential defect in the tyre, Ridgeback asks that you stop riding and arrange an inspection of your tyres at your nearest Ridgeback dealer. Defective tyres will be replaced.Ridgeback points out that you can expect between 2,000 and 4,000 miles, and around three to five years use from the Vee Zilent tyre before it needs replacing. With affected bikes stretching back to 2020, its possible the tyres on some older bikes may already have been replaced.