The nimbus sport reflect tire has a smooth tread that rolls fast and serves as the perfect fit for any rider looking to get around town there are many widths to accommodate different models riding styles and comfort levels while the blackbelt flat protection adds confidence for riding over rough city roads and bike paths for an extra touch of protection this model includes reflective accents that increase your visibility to motorists in low light conditionscasing 60 tpibead wirecompound 70