Micro drive

Micro drive

Micro drive is a term used to describe the drivetrain, mostly BMX and MTB, that use smaller than standard sized cogs.[1] The smallest rear sprocket that fits on a freehub body is an 11-tooth, but with the use of a cassette hub, sometimes called a micro drive rear hub, sprockets as small as 8 teeth may be used.[2]

The advantage of micro drive is that it means a smaller front sprocket, or chainring, can be used without affecting the gear ratio, providing better ground clearance.[1] For example, a bike using a 32t chainring with a 16t rear sprocket can change to a 18t chainring and a 9t sprocket, keeping the 2:1 ratio. Another advantage is the reduction in weight with the reduction in size of all the parts.[1]

The disadvantage is increased stresses on the drive train, leading to increased wear and even premature failure. Chain stretching and breaking can occur more easily. As the front and rear sprockets become smaller, the drive tension in the chain increases. Designers can overcome these issues by choosing materials with higher yield strengths, however usually at higher costs.

References

  1. ^ a b c "Suntour Components Catalog 1992: MD (Micro Drive Design)". The Bicycle Info Project. http://www.equusbicycle.com/bike/suntour/catalog92/pdf/Suntour1992%20-%200003.pdf. Retrieved 2011-08-18. "Smallest rings and gears: by reducing the diameter of the chainring bolt circle diameter on the crank arm, SUNTOUR is able to replace the standard 46/ 36/24 (or 48/28/28) with a compact 42/32/20 on the front chainrings." 
  2. ^ "Wheels / Hub Tech Help". Dan's Competition. http://www.danscomp.com/serve/faq/wheels_hubs_faqs.htm. Retrieved 2011-08-18. "Currently with a cassette hub you can run as small as an 8t cog." 



Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • micro drive — /mīˈkrō drīv/ noun 1. Formerly, a device used on some microcomputers for writing and reading data to and from a continuous loop of tape held in a cartridge 2. Now a very small hard disk drive ORIGIN: ↑micro (1f) …   Useful english dictionary

  • Micro Machines (video games) — Micro Machines is a series of computer and video games featuring toy cars, developed by Codemasters and published on several platforms (including Nintendo Entertainment System, Amiga, Mega Drive/Genesis, Super Nintendo Entertainment System, Game… …   Wikipedia

  • Micro Machines (Computerspiel) — Micro Machines Entwickler Codemasters Publisher …   Deutsch Wikipedia

  • Micro combined heat and power — or micro CHP is an extension of the now well established idea of cogeneration to the single/multi family home or small office building. Contents 1 Overview 2 Micro CHP systems 3 Engine types and technologies …   Wikipedia

  • Micro-Ice — is one of the main protagonists in the animated series, Galactik Football. He s the Snow Kids Striker (at the previous position of Artegor Nexus) and has a strong crush on his team mate Yuki. He is also best friends with D Jok. Season 1 Micro Ice …   Wikipedia

  • Micro Golf — ist die Miniaturform des Golfs. Gespielt wird mit einer Golfernachbildung aus Polyamid. Grundsätzlich kann Micro Golf auf allen Untergründen gespielt werden. Was man als Loch benutzt, bleibt jedem Spieler selbst überlassen. Inhaltsverzeichnis 1… …   Deutsch Wikipedia

  • Micro Machines (серия игр) — Micro Machines Жанр Автогонки Разработчик Codemasters Big Red Software Merit Studios Mindscape Supersonic Software Издатель Codemasters Camerica Ocean Software Gametek Midway THQ Платформы …   Википедия

  • Micro Machines (videojuego) — Micro Machines es la conversión de los coches en miniatura Micro Machines de la empresa Hasbro a lo virtual. Un juego de carreras cuyos principales circuitos pueden ser cualquier rincón de la casa los cuales hacen el juego más divertido y… …   Wikipedia Español

  • Drive with a dead girl — au Rouge (Rijsel, fr.) Pays d’origine …   Wikipédia en Français

  • Micro Commandos — Developer(s) Monte Cristo Publisher(s) Monte Cristo …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”