Apollo Tyres is to invest a further Rs 1,200 crore to expand the radial bus and truck tyre making capacity at its factory near Chennai. The facility is at Oragadam, about 60 km from here, in which Rs 2,100 crore is already invested. The current daily capacity is 6,000 truck and bus radial tyres, beside 16,000 passenger car tyres. Last year, it had said it would spend Rs 1,500 crore to expand the bus and truck capacity to 8,900 tyres a day. This has been revised to Rs 2,700 crore and 12,000 bus and truck tyres a day, in the next three years.