BIke Gears

Discussion in 'Cycling Equipment' started by swalke39, Feb 7, 2013.

  1. swalke39

    swalke39 New Member

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    Hey there I just bought my first road bike last week it arrived earlier today.
    The bike I ordered was a 21 speed and I think I may have gotten a 14 speed as the gear shifters don't seem to add up to 21.
    the left shifter for the front derailer has 2 and the right for the rear has 7.
    http://www.amazon.com/gp/product/B0087D8LRQ/ref=oh_details_o00_s00_i00
    is the bike that I bought.
     
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  2. vspa

    vspa Active Member

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    that is how it works, just press again the left shifter and it will go over the 3 front chainrings (if you count 2 front chainrings, then yes it is not the bike on the picture)
     
  3. daveryanwyoming

    daveryanwyoming Well-Known Member

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    Yep, a 21 speed bike should have three chainrings up front on the crankset and 7 gears on the rear cog. Sounds like the updated the model or sent you the model with a double chainring crankset. If the double chainrings have similar gear ratios for instance if it's equipped with a 34 tooth small chainring and a 50 tooth large chainring then it's not a big difference from a practical use standpoint. But if you really needed the triple chainrings for instance if you plan to load the bike up for heavy touring or have to climb a lot of steep hills and need the extra low gearing of a triple then you've got an issue.

    You should at the very least review your order and call them up to tell them they shipped you a bike equipped differently than what was advertised.
     
  4. swalke39

    swalke39 New Member

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    ok so the bike has 3 front chainrings however the left shifter only has 2 options the smallest or the middle one. It will not go to the third.
     
  5. daveryanwyoming

    daveryanwyoming Well-Known Member

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    Ahhh, then vspa's got it.

    The click shifting should move over one chainring at a time but if you click multiple times you should go all the way to the big or small ring. If that's not the case then it's likely you need to adjust your shifters, either the cable tension is not correct or one or both of the limit screws on your front derailleur is not adjusted properly.

    At least you received the correct bike, now you just need to get it adjusted properly. Surf over to the Park Tools website for gear adjustement tutorials. Also check to make sure all cables and housings are properly seated in their ferrules or cable stops as that's a common problem when first assembling a shipped bike that could lead to what you're seeing.

    -Dave
     
  6. Pat Stowe

    Pat Stowe New Member

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    The front derailleur probably just needs to adjusted, simple to frustrating if you know what you're doing, simple to disastrous if you don't. If you'd bought the bike from a shop this would be right or re-adjusted for free and the vast majority of shops offer a free tune/adjustment up after 100 miles or thirty days.
     
  7. maydog

    maydog Well-Known Member

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    The high limit stop on the der may be set too tight as well.
     
  8. Rishabh Sachan

    Rishabh Sachan New Member

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    hey friends the bike has 3 front chainrings however the left shifter only has 2 options L or H
     
  9. CAMPYBOB

    CAMPYBOB Well-Known Member

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    IIRC the shimaNO A050 shifters on your bike are SIS indexed 7-speed for the rear deraileur and friction shifting for the front derailleur.

    The front shifter is marked "LOW" and "HIGH", but if adjusted properly it will throw a triple crankset. The middle ring position will be in between the indicated Low and High.

    As stated above, if the bike is nor shifting properly, your derailleur needs dialed in.
     
  10. Pat Stowe

    Pat Stowe New Member

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    Take it someone who can see it. All we can do is guess
     
  11. dabac

    dabac Well-Known Member

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    +1

    A little basics here:
    Indexed shifting means that the shifter moves between set positions to get the derailer to line up with the different sprockets/chainwheels.
    Friction shifting means that the shifter will move "seamlessly" through its range of motion, and it's up to the rider to position the shifter/derailer by feel to get the desired gear.
    L/H are user instructions, not gear positions. "want a higher gear? push this way"

    There's nothing inherently wrong with this, it's how multi-geared bikes all were built for quite some years. And some diehards still prefer it due to its simplicity and robustness.
    They're really low on maintenance and there are very few compatibility issues.
    For the front, where there are few positions to hit, and friction offers an easy way to avoid chain rub it's still a decent solution for almost everyone.
     
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