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  1. #1
    Senior Member hsjb's Avatar
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    New "drivetrain" questions

    I am new to road bikes and tested some new bikes yesterday and had some questions regarding what I noticed regarding shifting (on 105/Tiagra) yesterday.

    Shifting up either rear or front chainwheels were relatively loud and rough. Shifting down in the rear was smooth but shifting down in the front was problematic and rough. On the front, I had to some times press the lever twice to make it shift to a smaller wheel.
    Q1) Do these drivetrains smooth out after a few rides?
    Q2) Is it my inexperience with using the modern Shimano shifters that's causing some of the problems?
    Q3) I also noticed that the drivetrain was much more susceptible to cross chaining than my mt. bike ever has. On my mt. bike, I only sense cross chaining on the smallest or largest chainwheels. It seemed on the 105s that I had it much more often. Is this something that decreases with usage? Or do I need to be much more careful?
    1986 CyclePro
    1992 Diamondback Apex with Deore DX
    2004 Bianchi Vigorelli with Speedplay Frogs

  2. #2
    A Heart Needs a Home Rich Clark's Avatar
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    1) A properly adjusted drivetrain doesn't need to smooth out. It's already smooth.

    2) Maybe. When shifting the front, to a bigger ring, for example, it's necessary to hold the lever for a moment while the chain starts to shift before letting it go. You also have to learn how to trim the front derailleur.

    3) With a triple on a bike with short chainstays, yes, you may have that problem at the extremes. However, it really, really sounds like you were testing bikes that were very poorly set up.

    RichC
    Training: 2002 Fuji Roubaix Pro (105 triple)
    Commuting/Daytripping: 2001 Airborne Carpe Diem (Ultegra/XTR, touring wheels)
    Commuting/Touring: 2000 Novara Randonee (Sora/Tiagra/LX, fenders, lights)

  3. #3
    Senior Member
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    I think Rich is correct, improper set up and tune.
    Achieve your goals: Attitude is everything:

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