Advertise on Bikeforums.net



User Tag List

Results 1 to 9 of 9
  1. #1
    Senior Member
    Join Date
    Aug 2008
    Location
    SoCal
    Posts
    1,994
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    1" threaded headset, 26.4 or 27.0? Newbie question

    I just got this frame and fork. I bought a headset that is 30.2/ 26.4. Tange Passage.
    I get that 30.2 is the stack height but I don't know if 26.4 is the correct size for the crown race.

    I have installed a crown race before and it was tight but went on. I don't know if this crown race is going to go on there and I don't want to break it or damage the steerer. Maybe it needs a 27.0.

    I don't have digital calipers. Is there a norm for the size?

    It's a late 80's Univega frame made in Japan. Triple butted tubing probably made by Miyata.

  2. #2
    Senior Member
    Join Date
    Jan 2006
    Location
    Tucson, AZ
    Posts
    754
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You could check Sheldon's page and see if he lists the size crown for the frame you've got. Being more than 20 years old your frame may be something he looked at.

  3. #3
    Senior Member
    Join Date
    Aug 2008
    Location
    SoCal
    Posts
    1,994
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for that answer bikemeister.
    I see that 30.2 is the cup outside diameter. I will do some more research. I could go to the LBS and have them check it.

  4. #4
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    24,794
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    If the fork is JIS (27.0 crown race) almost any LBS can mill it down to ISO very easily.

  5. #5
    Old fart JohnDThompson's Avatar
    Join Date
    Nov 2004
    Location
    Appleton WI
    My Bikes
    Several, mostly not name brands.
    Posts
    11,842
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by tmh657 View Post
    I just got this frame and fork. I bought a headset that is 30.2/ 26.4. Tange Passage.
    I get that 30.2 is the stack height but I don't know if 26.4 is the correct size for the crown race.

    I have installed a crown race before and it was tight but went on. I don't know if this crown race is going to go on there and I don't want to break it or damage the steerer. Maybe it needs a 27.0.

    I don't have digital calipers. Is there a norm for the size?

    It's a late 80's Univega frame made in Japan. Triple butted tubing probably made by Miyata.
    30.2 is not the stack height, but rather the ISO cup seat diameter. 26.4 is the ISO crown race seat diameter. If you Univega happens to be JIS (30.0 cup seat and 27.0 crown race seat) rather than ISO, it can easily be milled to accept ISO head parts, which will give you much more flexibility in finding replacements anyway.

  6. #6
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,298
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by HillRider View Post
    If the fork is JIS (27.0 crown race) almost any LBS can mill it down to ISO very easily.
    Yeah unless it's chrome. Then some bike shops might tell you to **** off.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  7. #7
    another retro grouch Mr IGH's Avatar
    Join Date
    Apr 2009
    Location
    Chicago NW 'burbs
    Posts
    2,489
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by operator View Post
    Yeah unless it's chrome. Then some bike shops might tell you to **** off.
    I always take a file to the chrome before using the cutter.
    IGH's, Dyno Hubs, LED lights and old frames

  8. #8
    Senior Member vredstein's Avatar
    Join Date
    Aug 2008
    Location
    Tucson, Arizona
    My Bikes
    '02 Lemond Buenos Aires, '98 Fuji Touring w/ Shimano Nexus premium, '06 Jamis Nova 853 cross frame set up as commuter, '03 Fuji Roubaix Pro 853 back up training bike
    Posts
    694
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have a late 80's Univega that takes a 26.4 race.
    Those $20 digital calipers are a great investment. You can use them to measure seat tube derailleur clamp sizes, seat post diameters, chain line, stack heights, BB shell widths, axle lengths, flange diameters and flange-to-center lengths for wheel building, Q-factor, headset and axle spacer widths, etc. Without doubt, it's the most useful took for choosing components sizes.
    "See, it's not that getting wet is a big deal. Really, it's what you're getting wet with.
    Fenders....because it's probably urine."
    Bike Snob NYC

  9. #9
    Senior Member
    Join Date
    Aug 2008
    Location
    SoCal
    Posts
    1,994
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I am going to get the digital calipers. Good idea vredstein. You own a tire company and post here?

    It's 26.4. I took it to the place I bought the headset. It's actually a big beach cruiser store but the headset was only $8.99. The Tange Passage.

    The guy that assembles bikes pounded it on there. I was a little skeptical at first. English is not his first language. I asked him to please be careful of the paint.
    All is well. The build will go forward today.

Posting Permissions

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