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  2. Snell Memorial Foundation - Wikipedia

    en.wikipedia.org/wiki/Snell_Memorial_Foundation

    The Snell Memorial Foundation is a nonprofit organization created to provide a high quality standard of safety for helmets.Founded in 1957, the foundation is named after William "Pete" Snell, a popular sports car racer who died in 1956 of head injuries he received when the racing helmet he wore failed to protect his head.

  3. Bicycle gearing - Wikipedia

    en.wikipedia.org/wiki/Bicycle_gearing

    A single-speed bicycle is a type of bicycle with a single gear ratio and a freewheel mechanism. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle. Adult single-speed bicycles typically have a gear ratio of between 55 and 75 gear inches, depending on the rider and the anticipated ...

  4. Gear inches - Wikipedia

    en.wikipedia.org/wiki/Gear_inches

    Gear inches is one way of measuring the gear ratio(s) of a bicycle, so that different gears and different bicycles can be compared in a consistent manner. Gear inches is an imperial measure corresponding to the diameter in inches of the drive wheel of a penny-farthing bicycle with equivalent ( direct-drive ) gearing.

  5. Bicycle performance - Wikipedia

    en.wikipedia.org/wiki/Bicycle_performance

    The fitness and cadence of the rider, bicycle tire pressure and sizes, gear ratios, slope of the terrain affect the overall speed of the rider. A person pedalling with 100 W power can achieve 5.5 m/s on a roadster, 7.5 m/s on a racing bicycle, 10 m/s with a faired HPV and 14 m/s with an ultimate HPV.

  6. Riddell launches Axiom, the latest helmet to combat ... - AOL

    www.aol.com/finance/riddell-launches-axiom...

    Football helmets received a facelift on Wednesday as for the first time in roughly seven years, Riddell, the leading helmet manufacturer in the NFL and college football, launched a new helmet in ...

  7. Rohloff Speedhub - Wikipedia

    en.wikipedia.org/wiki/Rohloff_Speedhub

    The Speedhub is more expensive than competing bicycle gear systems (both hub gears and derailleur gears), and it is some 100 grams heavier than a comparable set of derailleur gears, [2] but offers about the same gear range (and at its ratio of 5.26:1 more range than a typical road bike ratio of 4.28:1 with 50/34 chainrings and 11 to 32 tooth ...