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  1. #1
    Senior Member OldsCOOL's Avatar
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    What Type Rim Is This

    Could someone hazard a guess on this rim? I'm thinking it's a clincher but need some help ruling out the tubular possibilities. It's a 75-77 Colnago Super, been barn stored since last race in '78 or so. Sorry, it's the only pic I have for now.

    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

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  2. #2
    Senior Member OldsCOOL's Avatar
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    Here is another angle....

    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

    '85 Trek 460 road racer

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    '79 Motobecane Super Mirage

  3. #3
    Senior Member CroMo Mike's Avatar
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    Sure looks like a sew-up to me.
    Campagnolo - where rich people send their kids for the summer.

  4. #4
    Senior Member Sir_Name's Avatar
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    Agreed. Is that an auction tag? Nice bike.

  5. #5
    Senior Member OldsCOOL's Avatar
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    Quote Originally Posted by CroMo Mike View Post
    Sure looks like a sew-up to me.
    In the second photo that back wheel is visible, has a rather shallow look for a clincher.
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

    '85 Trek 460 road racer

    '89 Raleigh Technium PRE

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  6. #6
    aka Tom Reingold noglider's Avatar
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    Clincher tires don't get that flat when deflated, so I'm voting for tubular.
    I have made this longer than usual because I have not had time to make it shorter. --Blaise Pascal

    Tom Reingold, noglider@pobox.com
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  7. #7
    Still learning oddjob2's Avatar
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    Quote Originally Posted by noglider View Post
    Clincher tires don't get that flat when deflated, so I'm voting for tubular.
    +1 No doubt about it.
    Life is like riding a bicycle. To keep your balance you must keep moving. Albert Einstein
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  8. #8
    Senior Member OldsCOOL's Avatar
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    Thanx, guys. Just wasnt sure since I didnt see any glue marks. Thought this was a frameset and it turned out to be an intact classic. We'll see what happens.
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

    '85 Trek 460 road racer

    '89 Raleigh Technium PRE

    '79 Motobecane Super Mirage

  9. #9
    Senior Member OldsCOOL's Avatar
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    What is the availability of 27" tubular/sew-ups?
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

    '85 Trek 460 road racer

    '89 Raleigh Technium PRE

    '79 Motobecane Super Mirage

  10. #10
    Still learning oddjob2's Avatar
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    I thought sew ups only came in 700c. Tufo, a brand cited here, start at $60 a pair.

    wiggle.com | Tufo S33 PRO Tubular Tire | Road Race Tubular Tires
    Life is like riding a bicycle. To keep your balance you must keep moving. Albert Einstein
    2015 Additions: 2001 Eddy Merckx AX Titanium, 1981 Peugeot PKN10, 1987 Centurion Ironman Expert, Raleigh Super Course MKII

  11. #11
    iab
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    Senior Member iab's Avatar
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    Quote Originally Posted by OldsCOOL View Post
    What is the availability of 27" tubular/sew-ups?
    There is no such thing.

    700c only. But sometimes referred as 28".

    Tire Sizing Systems

  12. #12
    Senior Member Grand Bois's Avatar
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    They absolutely don't exist. Never did. Some have been labeled 27" anyway.

  13. #13
    Senior Member OldsCOOL's Avatar
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    Ok, cool. As is obvious, I have never had or even wanted to have sew-ups.....but I would make this a major consideration!
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

    '85 Trek 460 road racer

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  14. #14
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    Should you score the bike, you could always swap out the wheel set for a set of 700 clinchers.

    Where is this bike located ?

    Heh heh …

    No, of course you don't have to answer that question.
    hope you get it.

  15. #15
    Senior Member trailangel's Avatar
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    What would it matter? Looks all original and you are deciding to buy based on the rims???
    I would rather have the sewup rims. They ride better.

  16. #16
    Senior Member Grand Bois's Avatar
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    You should at least try tubulars. You might like them.

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    Ditto.

  18. #18
    Senior Member miamijim's Avatar
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    Quote Originally Posted by OldsCOOL View Post
    Ok, cool. As is obvious, I have never had or even wanted to have sew-ups.....but I would make this a major consideration!
    On a bike like that it is NO consideration. If it's within your means buy it regardless.

    In tubular tire lingo 700c, 28" and 27" are all the same!!!
    WWW.CYCLESPEUGEOT.COM 1984 Schwinn Paramount; 1987 Schwinn Paramount; 1975 Tom Ritchey, 198X Vitus

  19. #19
    Senior Member Grand Bois's Avatar
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    I like them, but not enough to change all of my clinchers to tubulars.

  20. #20
    Senior Member OldsCOOL's Avatar
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    Quote Originally Posted by miamijim View Post
    On a bike like that it is NO consideration. If it's within your means buy it regardless.

    In tubular tire lingo 700c, 28" and 27" are all the same!!!
    Absolutely agree!
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

    '85 Trek 460 road racer

    '89 Raleigh Technium PRE

    '79 Motobecane Super Mirage

  21. #21
    Senior Member Grand Bois's Avatar
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    A quick way to tell for sure is to use your thumbs to try to peel the tire away from the rim.

  22. #22
    verktyg verktyg's Avatar
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    Quote Originally Posted by miamijim View Post
    In tubular tire lingo 700c, 28" and 27" are all the same!!!
    +1 "Most" modern sewups are 700c but in certain European countries they were occasionally marked 27" or even 28".

    More recently 650 and 26" tubulars were introduced for smaller sized frames and specialty racing bikes.

    There were also 20" and 24" tubulars used on kid's racer bikes.


    A Continental cyclocross tubular from the late 70's marked 27 x 1 1/8 - these tires were 700c x 28mm. This one is about 38 years old, still hold air and is probably rideable!

    ContinentalCyclocrossSidewall.jpg ContinentalCyclocrossTread.jpg

    Sewups rarely had or have sizes marked on them. In general, they range from 700c x 18mm to 700c x 32 or even a few larger ones for CX (cyclocross).

    You had to look up the specs in catalogs to find the published sizes.

    My all time favorite sewups were Clement Red Label cotton Paris-Roubaix tires. They had a 28mm cross section. Next were Clement Del Mundo setas (silks). Their cross section was 26mm. The Paris-Roubaix setas were 25mm.

    Most popular road sewups were 22mm to 24mm. CX tires ranged from 25mm to 32mm.

    Sewups stretch over time plus manufacturing variances probably influenced tire makers reluctance to use dimensional markings on the casings.


    WAYY back in the day, many bikes used tires with the tubes sewn into the casing. I remember a few bikes form the 1920's to the 1940's that our shop owner had in his collection. The tires were 28" and maybe 30" with a 2" to 2 1/2" cross section. they were glued on just like modern sewups.

    Check out some of the boa constrictors that the racers used back in the first 40+ years of the last century.


    verktyg

    Chas.
    Last edited by verktyg; 05-22-15 at 12:31 AM.
    Things aren't always what the seem... Don't believe everything you think!

    Chas.

  23. #23
    Senior Member CliffordK's Avatar
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    My Colnago Super, which is a little older than that one originally came with 700c sewups. I don't think Colnago ever used 27" wheels.

    As others have mentioned, try the sewups/tubulars. There have been advancements over time, especially if you choose to use a sealant in them.

    It isn't too big of a deal to rebuild a wheel with clincher rims, or perhaps you would choose to keep the tubular wheels for spares/show, and get a new set of everyday wheels.

  24. #24
    Senior Member OldsCOOL's Avatar
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    If I were to acquire such a classic I wouldnt change over to clinchers. The novelty of the tire and the racing heritage seems fitting to keep it that way and since it wouldnt be a daily rider.
    Having a flat tire as part of the total cycling experience is highly overrated. Knowing how to fix one quickly is not.

    '85 Trek 460 road racer

    '89 Raleigh Technium PRE

    '79 Motobecane Super Mirage

  25. #25
    Senior Member crank_addict's Avatar
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    The way description reads, 'last raced in '78' and then stored in a barn, might have some valuable and sought after vintage tubular tires. Chances are likely trashed but if not, some vintage high-end tubulars are worth more than the wheels. Take a peak on fleabay listings and compare with some of the early stuff.

    If the carcass is good and has potential, the tubes can be replaced. Could even update to removable valve core type.
    “If the constellations had been named in the twentieth century, I suppose we would see bicycles.” ~ Carl Sagan

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