In 1987, the StarRider based on the Mercedes-Benz 811D chassis was introduced. This was a heavier chassis with a proven reliability record and had seating for 33 passengers. London Regional Transport took 123 StarRiders and a total of just under 320 were built between 1987 and 1994. In an attempt to break into the export market, the ColumboRider was subsequently developed, named after the city of Colombo in Sri Lanka, where the first examples were sold. The ColumboRider was a semi-integral version of the StarRider, based on a chassis made by a consortium including Optare, Japanese technology company Itochu and local Sri Lankan manufacturer Ceylinco. The ColumboRider was replaced by an export version of the MetroRider. In 1990, Optare bodied thirteen Renault S50 minibuses with a welfare bodywork which has since come to be known as the 9000-series, due to the allocated body numbers. As standard, the 9000-series community transport minibus had a front door, nine passenger seats and a rear tail lift for wheelchair access. All thirteen examples built were delivered to Leeds City Council between March and May 1990, and no further orders were ever placed. In 1988 the first full size Optare product appeared, the Delta. This was a single-deck bus based on the DAF SB220 chassis. The Delta bodywork featured contemporary styling and was aluminium with a bolted frame licensed from Alusuisse. The Delta successfully found a niche in the full-size single deck bus market, which was very limited at that time. Approaching 370 Deltas were built before production ended in 1998. Dennis had effectively created a new market segment, known as a midibus, with the introduction of the Dennis Dart. Optare soon introduced a competitor, the Vecta, albeit slightly bigger and wider than the Dart at that time, seating 40 in a full width 2.5m body. The chassis was the MAN 11.190 and featured a ZF gearbox and full air suspension. The bodywork was a scaled down version of the Delta. The CityPacer and StarRider were phased out in the years after Optare purchased the design for the MCW Metrorider in July 1989, rebranding it as the Optare MetroRider. This was a larger design than the CityPacer, and more robust when compared to the StarRider. It was Optare's first venture into fully integral vehicle manufacturing, and became the mainstay of the Optare midi/minbus offering until the low floor Solo was introduced in 1997.