Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Senior Member
    Join Date
    Aug 2010
    Posts
    118
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Trying to figure out my gearing...

    I recently got a Dawes SST AL as my commuter. I use it as a freewheel'd single speed, not fixed. The problem is that i feel like im spinning too much once im on a smooth open road. Its currently a 48:17 setup. Im debating getting a 16t freewheel but am worried it will make no worthwhile difference. Any opinions on the matter? moving from a 17t to a 16t freewheel?

    Or should i just get like a 50t chainring? which will require a new chain as well. And which ring would you suggest? its just a budget bike. I prefer to spend the real dollars on my mtb.
    thanks for any advice.

  2. #2
    Senior Member
    Join Date
    Apr 2010
    Posts
    67
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Changing the freewheel by one tooth will make quite a big difference. I think with a 48t chain ring, dropping a tooth on the freewheel is like 4 gear inches. http://software.bareknucklebrigade.c...it.applet.html

    check out that site and play around with different setups.

  3. #3
    . xavier853's Avatar
    Join Date
    May 2009
    Location
    Columbus
    My Bikes
    Pegueot UO8, Tommaso Augusta
    Posts
    2,027
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)


    There will be a difference. Not huge but definitely noticeable.

  4. #4
    GONE~
    Join Date
    Apr 2010
    Posts
    6,745
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Gear inches = Chainring tooth / Cog tooth x Tire diameter in inches.

    Common tire sizes in inches.
    700x23c = 26.275
    700x25c = 26.375
    700x28c= 26.575
    700x32c= 27

    Example: 44 / 17 x 26.275(23c) = 68.005.... round it to the nearest tenth and voila!

  5. #5
    It's MY mountain DiabloScott's Avatar
    Join Date
    Sep 2006
    Location
    Mt.Diablo
    Posts
    5,114
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    How much is "too much spinning" ??
    With a 48-17 you'll be doing 25mph at 110rpm...
    With a 48-16 you'll be doing 25mph at about 102rpm.
    http://diabloscott.blogspot.com/

  6. #6
    GONE~
    Join Date
    Apr 2010
    Posts
    6,745
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I bet he tops out at ~80rpm and feels too slow, so moving up a gear or two to higher his speed at ~80rpm.

  7. #7
    Senior Member
    Join Date
    May 2010
    Posts
    129
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I went up two teeth from my 16:48 to a 18:48. And it's a lot more comfortable, the switch was pretty big and I don't regret getting a 17t. You should be good jumping up a tooth.

Posting Permissions

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