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In the Malaysian market, models equipped with a 7-speed transmission are relatively rare, but some high-end configurations of the Mazda 6 may feature a 7-speed dual-clutch transmission, which excels in acceleration response and fuel efficiency. The Mazda 6 primarily utilizes a SkyActiv technology-based 6-speed automatic transmission, with technical highlights including a flat torque converter and a lock-up range of up to 89%, significantly enhancing power delivery efficiency. For customers requiring a 7-speed transmission, they may consult local dealers to verify specific model configurations, while noting that transmission types vary by model year and trim level. Other domestic brands such as Proton and Perodua predominantly employ 5-speed or 6-speed transmissions, prioritizing practicality and cost-effectiveness.

The choice between 21-speed and 7-speed bicycles requires comprehensive consideration based on riding needs and usage scenarios. The 21-speed system employs a combination of three front chainrings and a seven-speed rear cassette, providing 21 gear ratio options suitable for complex terrains like mountain biking. Its multi-gear design allows more precise matching to gradient changes but demands certain gear-shifting skills from the rider. The 7-speed system features a single front chainring paired with a seven-speed rear cassette, offering simpler mechanics and lower maintenance costs, making it ideal for urban commuting or flat terrains, particularly for beginners or riders prioritizing convenience. Performance-wise, the 21-speed system reduces leg strain through lower gear ratios during climbs and enhances efficiency with higher gear ratios during descents. The 7-speed system, with its narrower gear ratio range, better suits steady-pace riding. Notably, gear count doesn't directly determine speed - actual velocity depends on the rider's cadence coordinated with gear ratios. Larger cassettes (typical in 7-speed setups) require less effort but yield lower speeds, while larger chainrings (like the triple-chainring design of 21-speed systems) deliver greater driving force. For leisure cycling or short commutes, a 7-speed is recommended. Those frequently encountering hilly terrain or seeking greater adaptability should opt for 21-speed. Budget-wise, the price differential typically ranges between 300 to 800 Malaysian Ringgit, varying by brand and material specifications.

The numbers 1 to 5 on a car's gear shift represent different forward gears in a manual transmission, used to match vehicle speed with engine speed for efficient power output. Gear 1 provides the highest torque, suitable for starting or climbing steep hills; Gear 2 is for low-speed driving (approximately 20-40 km/h); Gear 3 corresponds to medium speed (40-60 km/h), ideal for urban roads; Gear 4 is for cruising on highways (60-80 km/h); Gear 5 is the high-speed gear (above 80 km/h), which reduces engine speed to save fuel. Gears should be shifted sequentially according to vehicle speed to avoid jerking or engine overloading caused by using a high gear at low speed or a low gear at high speed. Note that the R gear is for reverse, and the vehicle must be completely stationary when engaging it. Automatic transmissions use letter designations (such as P/R/N/D), where the D gear automatically shifts through the equivalent of manual gears 1-5. Proper gear usage enhances driving smoothness, extends transmission life, and optimizes fuel efficiency.

The choice between 3.73 and 4.10 gear ratios depends on specific usage scenarios and needs. A 4.10 gear ratio delivers stronger initial acceleration and climbing capability, making it suitable for scenarios requiring high torque output such as heavy loading, mountain road driving, or track racing. However, fuel consumption is relatively higher during high-speed cruising. A 3.73 gear ratio offers better fuel economy at high speeds, ideal for long-distance driving in plain areas or users prioritizing energy efficiency for daily commuting, though its acceleration performance is slightly inferior to the 4.10. For example, track-focused models like the Mitsubishi Lancer Evolution IX often adopt 4.10 to enhance cornering handling, while straight-line acceleration models such as the Ford Mustang GT tend to favor 3.73 to balance power and fuel consumption. If the vehicle frequently needs to tow heavy loads or tackle steep slopes, 4.10 is more practical; if highway driving is the primary use, 3.73 provides higher overall efficiency. It should be noted that modifying the gear ratio may affect the balance of the original factory tuning, so it is recommended to prioritize the recommended configuration in the vehicle manual.

The number of gears in a car engine depends on the type of transmission and the vehicle model design. Manual transmissions typically have 4 to 6 forward gears, while automatic transmissions usually range from 4 to 8, with high-end models possibly equipped with 9-speed or 10-speed transmissions. More gears enable the vehicle to better optimize power output and fuel efficiency under varying driving conditions, but they also increase manufacturing costs and operational complexity. Common manual transmission configurations include 5-speed or 6-speed; for instance, the Honda Civic features a 5-speed manual, whereas the Toyota Corolla provides a 6-speed manual. Among automatic transmission models, 6-speed and 8-speed are more common, such as the BMW 5 Series GT equipped with an 8-speed automatic transmission. CVT (Continuously Variable Transmission) theoretically has no fixed gears, though some models simulate traditional gears to improve the driving experience. Commercial vehicles like trucks may have more gears to accommodate specific requirements. Selecting the appropriate number of gears necessitates a balanced consideration of driving needs, fuel efficiency, and cost factors.