Does Bike Cassette Speed Actually Matter! 9 VS 10 VS 11 Speed & Cost To Upgrade?

An 11-speed cassette will have finer increments from one gear to the next, whereas with a 9-speed cassette those increments will be larger. For triathletes, having a consistent cadence is an important consideration and the 11-speed cassette will make this consistency easier to achieve. However, there are other considerations such as compatibility and price.