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Volvo B9TL
The Volvo B9TL is a low-floor double-decker bus built by Volvo Buses since 2002. It superseded the older Volvo B10TL (also known as the Super Olympian) and the Volvo B7TL, and was superseded by the Volvo B5TL in Europe.
==Chassis==
The B9TL chassis shared the same design of the B7TL. The key difference from both its predecessor, the B10TL Super Olympian and B7TL, is the new 9.3-litre engine originally designed by Renault Trucks. The radiator is located at the rear offside, similar the smaller B7TL. The front module design is shared with other low-floor bus chassis built by Volvo, and independent suspension is fitted at the front axle (replaced by conventional front suspension after some years of production).
The B9TL was initially offered in three-axle format, and the two-axle variant was added in 2006 to replace the B7TL. The driveline comprises a Volvo D9A Euro III engine (rated at 300 bhp or 340 bhp), which was later replaced by the Volvo D9B Euro IV engine (uses selective catalytic reduction technology; two versions were offered - the D9B260 rated at 260 bhp for two-axle version, and a higher powered D9B310, rated at 310 bhp, for three-axle version), and coupled to a ZF 5/6-speed gearbox. Volvo also offer the Voith four-speed gearbox as an option.
The front wheels of three-axle B9TL are usually supplied by ALCOA of the USA, but some buses (including the three prototypes) have all their wheels supplied by ALCOA.
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