Buying a new bike - what do these terms mean

Discussion in 'Australia and New Zealand' started by jondor58, Mar 9, 2013.

  1. jondor58

    jondor58 New Member

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    I've been riding for a while but dont know much about bikes. Im looking to buy a new bike, upgrading to carbon, I have only been doing research on the net so far. Can someone tell me what it means when a bike has words like "double" or "compact" in its name?
     
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  2. alfeng

    alfeng Well-Known Member

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    FYI. 99% of the answers you may seek with regards to jargon are probably available in the glossary on the www.sheldonbrown.com website ...


    While a "tandem" refers" to a bike which is capapble of accommodating two riders, a "double" typically refers to the number of chainrings on the crankset ("chainwheel" is the archaic term still used in many parts of the World since cranks only had the single, steel cha .

    • so, a bike may also have a crankset which is described as a "triple" if it has three chainrings or a "single" (less likely, since in context, 'I' would take it to refer to the number of "speeds" which a bike might have) if it has only one chainring

    Now, a "compact" crankset is a relatively new term coined about 10 years ago by Pinarello (AFAIK) to describe what had previously been pejoratively referred to as "Alpine" gearing ...

    • back in the day, if a bike had two chainrings, the tooth count was often 52t & 42t on "competitive" cranksets & on cranks used by "tourists" the crank might have a 36t inner chainring & was pejoratively referred to by cycling's cognoscenti as "Alpine" gearing ...
    • my vintage GITANE came with a 52/36 crankset
    • when I moved to altitude (7000 feet) way-back-when, I ended up installing 50t & 34t chainrings on a Sugino AT crankset (110BCD)
    • fast forward to ~10 years ago & Pinarello makes the 50/34 the "new norm" for wannabee racers who don't want a pie-pan Cassette and the euphemism "compact" crankset is coined!!

    • SHIMANO's engineers have been prone to go-off-the-reservation (for decades), and their most recent asymmetrical Dura Ace crank will probably be referred to as a 'Compact-S' crankset OR receive some other designation to separate it from a "normal" Compact crankset ...

    • BTW, a "micro" crankset typically refers to MTB (Mountain Bike) crankset whose outer chainring BCD (Bolt Circle Diameter) is smaller than 104mm (i.e., 104BCD) -- i.e., 94mm

    BUT, a "compact" frame is one whose top tube is not horizontal AND you will want to know the EFFECTIVE TOP TUBE (ETT) length when sizing the bike for any given rider.
     
  3. jondor58

    jondor58 New Member

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    Excellent, thank you very much for that, all makes perfect sence.
     
  4. BarbaraJ

    BarbaraJ New Member

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    Hello members I have started cycling just now can you recommend me some best bike stores in north Sydney?
     
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