Shimano Dura-Ace CS-R9100 12-25T Cassette

Specifications

• Model no.
  CS-R9100
• Brand
  Shimano
• Series
  Dura-Ace
• Groupset
  Dura-Ace R9100
• Tier
  Elite
• Intended use
  Road
• Weight (claimed average)
  175 g

  This is the manufacturer’s claimed average weight; actual weights may differ.

• Speeds
  11

  Speeds refers to the number of gears, which is determined by how many cogs are on a cassette.

• Gearing
  12-25 teeth
• Gear ratio
  208%

  Gear ratio shows the size of the gap between the largest and smallest cogs. When the difference is large, riders have access to both very hard and very easy gears; a smaller difference results in closer gear spacing, making it simpler to maintain a comfortable cadence. Also, keep in mind that the number of cogs (speeds) impacts how much each gear differs from the next.

• Smallest cog
  12 teeth
• Largest cog
  25 teeth
• Combination
  12-13-14-15-16-17-18-19-21-23-25

  Combination indicates the tooth count for each cog on a cassette.

• Steel cogs
  6
• Titanium cogs
  5
• Aluminum cogs
  0
• Compatible freehubs (splines)
  HG spline L
• Sprocket design
  HG-EV

  This describes the engineering behind the cassette's sprockets, which determines shifting speed, smoothness, and feel. It also affects shifting performance and wear under heavy load. Note that sprocket design can influence the selection of compatible drivetrain components.