Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Senior Member bluenote157's Avatar
    Join Date
    Apr 2006
    Location
    DC
    My Bikes
    Surly CC, Raleigh Team Pro, Specialized Rockhopper
    Posts
    950
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    what exactly is trimming in regards to STI?

    Whats the purpose of trimming? If my bike was tuned right, shouldn't i just be able to go from small to large chainring in one shift? Why is the trimming there? To overshift and drop back down? Or is it for use when you are in extreme gear combinations like large chainring and largest cog?

  2. #2
    L-I-V-I-N dtrain's Avatar
    Join Date
    May 2005
    Location
    Stafford, OR
    Posts
    3,260
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by bluenote157 View Post
    Or is it for use when you are in extreme gear combinations like large chainring and largest cog?
    Getting warmer...

    As you are in the small ring and heading into smaller cogs, you can give the FD a little bump to the outside an minimize the chain rub. Oh, and you don't have to trim on your way to the large ring. You can pass right through it with a full sweep.
    "The older you do get, the more rules they're gonna try to get you to follow. You just gotta keep livin', man, L-I-V-I-N." - Wooderson

    '14 Cannondale Synapse (carbon) - '04 Bianchi Imola (steel) - '99 Gary Fisher Big Sur (mtn)

  3. #3
    * vpiuva's Avatar
    Join Date
    Jan 2007
    Posts
    3,458
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Trim is only to keep your chain from rubbing on your FD - extreme or even less than extreme combinations. Middle of the cassette/small ring the chain is in a different position than the large cog/small ring. If yours never rubs, you don't need to trim. But there are cyclists that must like to listen to chain rub because they don't trim.

  4. #4
    Senior Member bluenote157's Avatar
    Join Date
    Apr 2006
    Location
    DC
    My Bikes
    Surly CC, Raleigh Team Pro, Specialized Rockhopper
    Posts
    950
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    good deal..thanks!

  5. #5
    Senior Member rodrigaj's Avatar
    Join Date
    Jul 2006
    Location
    Madison, WI
    Posts
    1,126
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It's has not been explicitly stated yet: Trimming is probably more of a factor if you have a triple crankset.

    Campy FD is much better than shimano for this reason.

  6. #6
    The Legitimiser Sammyboy's Avatar
    Join Date
    Jul 2005
    Location
    Southampton, UK
    My Bikes
    Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
    Posts
    4,848
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Trim is the major manufacturers subtle way of letting you know that friction shifting was always a better idea really.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •