Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10
  1. #1
    Same Speed, Different Day
    Join Date
    Dec 2006
    Posts
    35
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Riding a R20 as a Single Speed

    Hi !
    I'm currently not riding a folder (But I own a R20 frame) but as a single speed rider I have a question:
    Who rides a SS Raleigh Twenty and what is its current gear ratio ?
    Thanks

  2. #2
    Senior Member
    Join Date
    Sep 2005
    Posts
    526
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Howdy,
    My R20 isn't a single speed, but I do have a SS, 20" folder. I am running a 46x16 that gets me about 15mph at 90rpms. Hope this helps,
    Juan

  3. #3
    Senior Member Fear&Trembling's Avatar
    Join Date
    Oct 2005
    Location
    London
    Posts
    637
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    On my 20" inch fixed folder (not a Twenty though), I run 53/13 = 77 gear inches.

  4. #4
    All ur bike r belong Enki james_swift's Avatar
    Join Date
    Aug 2005
    Location
    San Fransicko
    Posts
    816
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    67 gear inches for the city, 72 gear inches for the suburbs.

  5. #5
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
    Join Date
    Sep 2004
    Location
    London UK
    My Bikes
    1982 Raleigh Twenty Hotrod Fixie; 1984 Peugeot Premier Fixie, 2007 Merc Lightweight folder
    Posts
    1,956
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Mine Twennie running 52 -> 14 as a fixie which gives me about 75 of your earth inches according the calculators I've used. It's pretty good for London though could afford to go down a tooth maybe on the rear for a bit of a higher top end.

  6. #6
    Senior Member
    Join Date
    Apr 2006
    Posts
    2,193
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    My Twenty in the middle one to one gear (3 speed) is 52 to 18 (57 gear inches). Roger

  7. #7
    Senior Member wahoonc's Avatar
    Join Date
    Jan 2005
    Location
    On the road-USA
    My Bikes
    Giant Excursion, Raleigh Sports, Raleigh R.S.W. Compact, Motobecane? and about 20 more! OMG
    Posts
    16,277
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by james_swift
    67 gear inches for the city, 72 gear inches for the suburbs.
    +1
    That is pretty close to what I run my fixed at (BTW it isn't a 20 either I actually think my city gear is around 64"...

    Aaron
    Webshots is bailing out, if you find any of my posts with corrupt picture files and want to see them corrected please let me know. :(

    ISO: A late 1980's Giant Iguana MTB frameset (or complete bike) 23" Red with yellow graphics.

    "Cycling should be a way of life, not a hobby.
    RIDE, YOU FOOL, RIDE!"
    _Nicodemus

    "Steel: nearly a thousand years of metallurgical development
    Aluminum: barely a hundred
    Which one would you rather have under your butt at 30mph?"
    _krazygluon

  8. #8
    Same Speed, Different Day
    Join Date
    Dec 2006
    Posts
    35
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Thanks alot !!!

    Thanks
    I'm thinking about building a SS R20 using the stock chain ring (44t) so I'll try to use a corresponding cog (probably 16t cog)

  9. #9
    Senior Member
    Join Date
    Sep 2005
    Posts
    526
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by SSDD
    Thanks
    I'm thinking about building a SS R20 using the stock chain ring (44t) so I'll try to use a corresponding cog (probably 16t cog)
    That will give you about 55 gear inches, give or take (I don't know your exact wheel diameter). That'll give you about 13.5-14.5mph at 85-95rpms,
    Juan

  10. #10
    jur
    jur is offline
    Senior Member
    Join Date
    May 2005
    Posts
    6,223
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    I would also aim for about 70GI. I have a SS with 77GI I used for commuting. I could only juuuust get it over a small 15% grade hill, and the downhills were OK. But I think what you need to do is check your average speed on the flats, aim for a 70-90rpm cadence and select the GI from there.

    Probably you're looking at a 13T or 14T sprocket in the back with a 46T chainring (the stock one), which will give you around 25-30km/h on the flats comfortably.
    My folding bike photo essays www.dekter.net/

Posting Permissions

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