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When I take my bikes I always fly "business" class (well they call it that way, it's the typical Lufthansa group fake medium-haul business class) with Condor which has one free sports item. They also have the 30kg limit but I never exceeded it with my bike case + bike + equipment (spare tyres, tubes, etc.). From my experience they don't really care about the weight limit at all if you're not flying economy anyways.