No, it is not possible to convert a 7-speed gear system to a 21-speed gear system. The number of speeds in a gear system is determined by the number of sprockets on the rear wheel and the number of chainrings on the front crankset. A 7-speed system has 7 sprockets on the rear wheel and one or two chainrings on the front crankset, while a 21-speed system has 7 sprockets on the rear wheel and 3 chainrings on the front crankset. Therefore, to convert a 7-speed system to a 21-speed system, you would need to replace the entire drivetrain, including the rear wheel, front crankset, shifters, and derailleurs. **

The Shimano 7-speed gear shift may crack in every gear due to a few potential reasons. One possible cause could be that the gear shift is not properly adjusted, leading to misalignment and causing the cracking sound. Another reason could be wear and tear on the gear shift components, such as the cables or the shifter itself, which can lead to issues with smooth gear changes. Additionally, the gear shift may crack in every gear if there is dirt or debris built up in the gear mechanism, causing friction and noise during shifting. Regular maintenance and proper adjustment can help address these issues and prevent the gear shift from cracking in every gear. **

It is not recommended to use fifth gear when driving uphill, as it may strain the engine and cause it to work harder than necessary. It is better to downshift to a lower gear, such as third or fourth, to maintain a steady speed and prevent the engine from overworking. This will also provide better control and power when driving uphill. **

From 5th gear, the next gear in most manual transmission vehicles is 6th gear. However, some vehicles may have additional gears beyond 6th, such as 7th or 8th gear. The higher gears are typically used for cruising at high speeds on highways to improve fuel efficiency and reduce engine strain. **

The speed of each gear in a vehicle depends on the specific gear ratios of the transmission. Generally, first gear has the lowest speed and highest torque, making it ideal for starting from a stop or climbing steep inclines. As you shift up through the gears, the speed increases while the torque decreases. The highest gear, typically fifth or sixth in a manual transmission, allows for the highest speed and lowest engine RPM, making it suitable for cruising at highway speeds. Automatic transmissions also have different gear ratios, but the specific speeds for each gear can vary depending on the make and model of the vehicle. **

From the 5th gear, you can shift to the 6th gear in most vehicles. The 6th gear is typically the highest gear in a manual transmission, providing the best fuel efficiency at high speeds. It is important to shift smoothly and at the appropriate time to ensure optimal performance and fuel economy. **

No, the neutral gear in a Zündapp moped is not the same as the first gear. The neutral gear is a separate position on the gear shift that disengages the engine from the transmission, allowing the bike to roll freely without the engine's power. The first gear is the gear that provides the lowest speed and highest torque, allowing the bike to start moving from a standstill. It is important to understand the difference between these two gears for safe and efficient operation of the moped. **

Yes, it is recommended to pedal while using a gear shift system. Pedaling while shifting gears helps to maintain a smooth transition between gears and reduces the strain on the drivetrain. It also helps to ensure that the chain moves smoothly from one gear to another. Additionally, pedaling while shifting gears can help prevent potential damage to the gears and chain. **