Modern expensive racing bikes can be worthwhile for serious cyclists who are looking for top-of-the-line performance, advanced technology, and lightweight materials. These bikes are designed to provide the best possible aerodynamics, speed, and handling, which can make a significant difference in competitive racing. However, for casual riders or those on a budget, the high cost of these bikes may not be justified, as there are plenty of more affordable options that can still provide a great riding experience. Ultimately, the decision on whether a modern expensive racing bike is worthwhile depends on the individual's cycling goals, budget, and level of commitment to the sport. **

Swivel chairs with ball bearings tend to be the most noiseless options for a home office. These chairs allow for smooth and quiet rotation without any squeaking or creaking sounds. Look for chairs with high-quality ball bearings and sturdy construction to ensure a noise-free experience while working in your home office. **

In most cases, the employer is responsible for providing an ergonomic workstation in the home office. This may include a comfortable chair, adjustable desk, monitor stands, and other ergonomic accessories. Employers have a duty to ensure that their employees have a safe and comfortable work environment, even when working remotely. However, some employers may require employees to cover some of the costs or provide a stipend for setting up a home office. **

The racing bike gear system is typically found on racing bikes, also known as road bikes. These bikes are designed for speed and efficiency on paved roads, and the gear system is essential for riders to adjust their pedaling resistance and maintain an optimal cadence. The gear system on racing bikes is often lightweight and designed for quick, precise shifting to accommodate the fast-paced nature of road cycling. **

No, female racing mice do not typically mount each other. Mounting behavior is more commonly seen in male mice as a form of dominance or mating behavior. Female mice may display aggressive behaviors towards each other, but mounting is not a typical behavior observed in female racing mice. **

There are several popular sim racing games available, each offering a unique experience for players. Some of the most well-known sim racing games include titles like Assetto Corsa, iRacing, Project Cars, and rFactor 2. The best sim racing game for you will depend on your preferences for realism, graphics, physics, and available cars and tracks. It's recommended to try out a few different games to see which one suits your style of racing the best. **

The old racing group being referred to could be any number of historic racing organizations, such as the Grand Prix, Le Mans, or NASCAR. Each of these groups has a rich history and has played a significant role in the development of motorsport. It would be helpful to have more specific information in order to accurately identify which old racing group is being referenced. **

Racing leagues are organized competitions where participants compete in various forms of racing, such as car racing, motorcycle racing, or even boat racing. These leagues often have a series of races held at different locations, with points awarded to drivers based on their finishing positions. The leagues may have specific rules and regulations that participants must adhere to, and they often attract a dedicated fan base. Racing leagues can range from local grassroots organizations to internationally recognized series like Formula 1 or NASCAR. **