page_title: Bicycle rollers
section_title: Variations
hierarchical_section_title: Bicycle rollers / Variations
caption_attribution_description: Indoor trainer
context_page_description: Bicycle rollers are a type of bicycle trainer that make it possible to ride a bicycle indoors without moving forward. However, unlike other types of bicycle trainers, rollers do not attach to the bicycle frame, and the rider must balance him or herself on the rollers while training. Bicycle rollers normally consist of three cylinders, drums, or "rollers", on top of which the bicycle rides. A belt connects the middle roller to the front roller, causing the front wheel of the bicycle to spin when the bicycle is pedaled. The spacing of bicycle rollers can usually be adjusted to match the bicycle's wheelbase. Generally, the front roller is adjusted to be slightly ahead of the hub of the front wheel.
context_section_description: Rollers are available in different widths (from 10" to 18") and diameters (from 4.5" to 2.25" for higher resistance). Some bicycle rollers use two front drums or cylinders instead of just one.
  Resistance may be added by having the spinning rollers driving some additional mechanism such as a fan. Some rollers have an internal flywheel on the back cylinder. This mimics real-world resistance to continuous acceleration and makes it possible to coast for up to 30 seconds.
  It is possible to remove the front wheel and mount the front fork in a stand (usually sold separately) to duplicate the stability of other bicycle trainers.
  Some rollers place the roller frame inside an external track so they can move (slide) fore and aft - which allow for simulating extreme pedalling off the saddle, as if climbing a hill. Strong elastic bands or springs are attached to each corner of the frame and pull and hold the roller frame in the tracks. A bicycle on the road can move fore and aft relative to the rider, and these rollers attempt to duplicate this effect.
caption: A flexible roller system allowing longitudinal movement.
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