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The high gears on your bike are governed by the smallest cog you can get on the back wheel, and the smallest cog you can put has been physically limited to 11 teeth (11T).
"Capreo" is a Shimano innovation targeted at folding bikes with small wheels that allow cogs down to 9T.
Although the Capreo standard has been around for quite a while, it is still relatively obscure. We have Capreo hubs and cassettes that give your recumbent bike or trike the gearing you want at high speeds.