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If they're using the same bike, then they're using the same technology - so any difference must be found with the rider and not the bike. If both riders are equally sized then there's nothing else than rider differences to blame. If one rider is tall, and the other short, then who the bike fits best can also be an issue.
If you're 6ft and want a strong, fast bike that's good for freestyle and trails, try the Faction Zeitgeist. Its got 22" wheels, so it looks proportionally better for tall riders.
It depends on how tall you are and what your intended use is. Best advice is to get along to a bike store to try some out, if you're taller than the average rider you may want to look at a bmx cruiser too.
Suzuki V-strom, 650 or 1000. You can purchase a taller seat right from Suzuki, put on a set of bar risers and can even lower the pegs if needed.
The ideal height for a rider to comfortably and safely ride a 19-inch frame bike is typically around 5 feet 9 inches to 6 feet tall.
When choosing a tall men's bike, important factors to consider include the frame size, handlebar height, seat position, and overall comfort and fit for the rider. It is crucial to ensure that the bike is the right size for the rider's height and that the handlebars and seat can be adjusted to provide a comfortable riding position. Additionally, considering the type of riding you will be doing and the terrain you will be riding on can also help in selecting the right tall men's bike.
Any Trails or Enduro style bike would be more comfortable for some one who is fairly tall.
The best bike options for tall men are typically those with larger frame sizes, such as mountain bikes or road bikes designed for taller riders. Look for brands that offer specific models for tall individuals, and consider getting a professional bike fitting to ensure the best fit and comfort.
Suzuki V-Strom
Dylan Rider is 173 cm.
Nancy Rider is 5' 3".