1. The most important thing about buying a new bike is to make sure it fits. The only way you'll know if the bike is right for you is to size up the bike and make sure that the bike's geometry matches your body's geometry. Ask questions and do some research.
mtn. biking 101
2. If possible, try to find a shop that will let you demo the bike on real dirt. Five minutes in a parking lot won't cut it. You wouldn't buy a car without a real world test drive, and a bike should be no different.
3. Don't belive the hype. Just because your favorite rider or best friend rides a certain bike, that doesn't mean that's the best one for you. Have an open mind and be realistic about your needs and ability.
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Thread: Bottom Bracket

  1. #1
    mtbr member
    Join Date
    Feb 2006

    Bottom Bracket

    I am planning to replace the cranks on my hybrid and I decided to put road cranks. The specifications are:

    FSA Vero Square Taper Chainset Features:

    Cold forged AL6061/T6 crank arms
    Precision 100% CNC machined AL7075/T6 Outer Ring
    AL7075 stamped and CNC machined chainrings
    Heat treated chromoly inner chainring
    Chromoly chainring bolts
    Q-Factor - 143mm
    BCD - 130mm (39.53t) or 110mm (36.46t)
    Chainline - 43.5mm
    Compatible with JIS Square Taper BBs and power driver BB
    Recommended BB BB-7420 (103mm), BB-8420(108mm)
    Black Anodized or Silver Polished
    Laser graphics
    Weight: 699 g

    The problem is that they recommend 103 or 108mm BB. My current one is 121mm. How does this affect the drivetrain? Thanks.

  2. #2
    mtbr member
    Join Date
    Jul 2003
    The different spindle length of the bottom brackets will give you different chainlines. This can have an affect on front shifting performance, the "Q factor" of the cranks, crank and chain stay clearance, etc.

    For a good explanation of chainline, read Sheldon Browns article here. All About Bicycle Chainline .

    Being that your bike is a Hybrid and not a road bike, you'll likely have to use a different spindle length than what is recommended to get the chainline correct for your set up.

    Good Dirt
    "I do whatever my Rice Cripsies tell me to!"

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