Features: -Resistance shifter easily attaches to bicycle handlebars for variable resistance. -Compatible with 26", 27" and 700c bikes -Variable adjustment, progressive magnetic resistance -Elastomer roller reduces tyre wear, quieter in operation and grips better. -Extra wide frame for stability. -Sturdy mounting cups reduce slippage (quick release included). -Quick release mechanism for easy attachment and removal of bike. -Quickly and easily folds for storage. -Heavy duty construction.