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  1. #1
    Senior Member zukahn1's Avatar
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    Corn Cobb Line Up

    Well this is just a pretty much fun photo of a bunch of corn cobbs in roughly size date order circa mid 70's to mid 80's Biggest cog in the line up is 21 smallest 12. I thought it would be fun before I sold them off or returned them to the bike coop after cleaning where I got them. Can you I'd your old race freewheel from back in the day.
    Last edited by zukahn1; 05-13-14 at 03:25 AM.

  2. #2
    Freewheel Medic pastorbobnlnh's Avatar
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    Nice panoramic photo. Cool idea.

    I have bunches of corn cob freewheels from many different brands in my collection. Unfortunately hardly anyone wants them. :0

    In my experience, the sweet spot for a vintage freewheel that a purest wants to mount and occasionally ride is the 13-26 standard spaced 6 speed. These are becoming harder and harder to acquire or to build.

    Occasionally I have a client who is restoring a '60s European bike who hopes display it as being 100% original. My job is to bring the 50+ year old Regina 13-19, 13-20, 14-21, 5 speed back to life. That can be a tough proposition when the two notch inner body has the removal notches all botched up!
    Bob
    Dreaming of Summertime in NH!

    Visit my websites:
    FreeWheelSpa.com orpastorbobnlnh.com

  3. #3
    Cisalpinist Italuminium's Avatar
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    Love my corncobs. On my vintage ride, I like to have a 13-14-15-16-17 paired with 52/42 up front, giving one gear smooth range for riding with the wind, and one against. Ah, the joys of living in a flat country. 42/15 sees most use, it comes as close to a "perfect" gear ratio as anything.
    Pass the Dutchie on the non-drive side.
    Rather a 100$ bike with 1000$ wheels than a 1000$ bike with 100$ wheels.

  4. #4
    Senior Member jeirvine's Avatar
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    I have a few, and have been kicking around the idea of corncob 6sp in rear and a triple up front. Anyone riding that sort of setup?
    The man who dies with the most toys…is dead. - Rootboy

  5. #5
    slow as I ever was Ex Pres's Avatar
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    Quote Originally Posted by jeirvine View Post
    I .......have been kicking around the idea of corncob 6sp in rear and a triple up front. Anyone riding that sort of setup?
    Not exactly a corncob, but I set up my Trek 600 with a 28/44/52 front and 6s 13-24 rear.
    On the Ranson, just a double up front, but 52/34 mated with a 7s 12-21 rear. Very little overlap.
    72 special CNC ___________ 72 Frejus (ala Legnano) __73 Holdsworth Record
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  6. #6
    Senior Member miamijim's Avatar
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    Florida freewheels!!
    WWW.CYCLESPEUGEOT.COM 2005 Pinarello Dogma; 1991 Paramount PDG 70 Mtb; 1976? AD Vent Noir; 1989 LeMond Maillot Juane F&F; 1993? Basso GAP F&F; 1989 Terry Symmetry; 2003 Trek 4700 Mtb; 1983 Vitus 979

  7. #7
    Senior Member Eric S.'s Avatar
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    When I had an '80s Specialized Sirrus, I once rode for a summer with a 13-18 6s straight block. Rarely ever got out of the 39T ring!

    I've been tempted to put a 12-21 9s on my De Rosa just for the look of it.

    12-21.jpg

  8. #8
    Senior Member crank_addict's Avatar
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    +1 (I like that set too.)

    I know it seems whacked, but the grind is part of the fun on an old bike. The only caveat is not over doing it to blow a knee.

    Quote Originally Posted by Italuminium View Post
    Love my corncobs. On my vintage ride, I like to have a 13-14-15-16-17 paired with 52/42 up front, giving one gear smooth range for riding with the wind, and one against. Ah, the joys of living in a flat country. 42/15 sees most use, it comes as close to a "perfect" gear ratio as anything.

  9. #9
    Senior Member Lascauxcaveman's Avatar
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    If you find me riding anywhere i could actually use one of those corncobs, I'll likely just be on my fixie
    ● 1971 Grandis SL ● 1972 Lambert Grand Prix ● 1972 Raleigh Super Course ● 1972 Peugeot UE-18 Mixte ● 1980 Apollo Prestige fixie ● 1982 Motobecane Jubile Sport ● 1983 Nishiki Landau ● 1984 Peugeot PH10LE ● 1984 Bianchi Limited ● 1985 Peugeot Vagabond ● 1985 Trek 600 ● 1985 Shogun Prairie Breaker ● 1985 Raleigh Elkhorn ● 1986 Univega Nuovo Sport ● 1987 Schwinn Tempo ● 1996 Kona Lava Dome ● And a Bike to Be Named Later ●

  10. #10
    PanGalacticGargleBlaster Zaphod Beeblebrox's Avatar
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    Quote Originally Posted by jeirvine View Post
    I have a few, and have been kicking around the idea of corncob 6sp in rear and a triple up front. Anyone riding that sort of setup?
    For a while, yes but I'm not currently using it. I had a 28-38-48 Triple and a 16-22 corncob. I liked it quite a bit. Not a ton of Top end but I was only using the 48-16 combo on downhills anyway and I can always coast down a hill...
    --Don't Panic.

  11. #11
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    My current project, the Raleigh Pro will get my old 14-19 freewheel mated to Record HF hubs. You could almost replace drive side spokes without taking the freewheel off.

  12. #12
    Gammal cyklist Reynolds's Avatar
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    Quote Originally Posted by Italuminium View Post
    Love my corncobs. On my vintage ride, I like to have a 13-14-15-16-17 paired with 52/42 up front, giving one gear smooth range for riding with the wind, and one against. Ah, the joys of living in a flat country. 42/15 sees most use, it comes as close to a "perfect" gear ratio as anything.
    +1. My 7sp 13-21 52-42 is ideal for flat country riding, 42/15 and 42/16 most of the time.

  13. #13
    PanGalacticGargleBlaster Zaphod Beeblebrox's Avatar
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    My current project, the Raleigh Pro will get my old 14-19 freewheel mated to Record HF hubs. You could almost replace drive side spokes without taking the freewheel off.
    ...and a 36/24 crankset ;-)
    --Don't Panic.

  14. #14
    Gammal cyklist Reynolds's Avatar
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    Quote Originally Posted by jeirvine View Post
    I have a few, and have been kicking around the idea of corncob 6sp in rear and a triple up front. Anyone riding that sort of setup?
    I ride a 7 sp 12-21 with 26-36-44 front on flat country roads and trails and it's OK for me. Maybe a 46 would be better for a little more top end for tailwinds.

  15. #15
    Senior Member Chombi's Avatar
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    Being a cheapskate, I had been buying quite a few corncobs to do my builds as they are usually quite cheap sometimes even in NOS condition, so half my bikes have corncobs on them (worst one being a 13/19 7 speed). But my regular rider, my PSV has a more reasonable FW on it (13/24 6 speed) I "lend" the wheelset with it to my other bikes when I know I have some climbing to do....

  16. #16
    johnliu@earthlink.net jyl's Avatar
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    I have one bike with 53/39 x 12-21 seven speed and a second bike is 53/42 x 12-17 six-speed. I can ride the first one pretty much anywhere I want to ride, while the second one is going to get a less aggressive freewheel - maybe a 13-23, something like that.
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  17. #17
    Senior Member due ruote's Avatar
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    Quote Originally Posted by Reynolds View Post
    I ride a 7 sp 12-21 with 26-36-44 front on flat country roads and trails and it's OK for me. Maybe a 46 would be better for a little more top end for tailwinds.
    I used a 12-21 7 speed on my Stumpjumper drop bar conversion, 28-38-48 front. It worked out really well.

    But I'm wondering for the record, what is the definition of corncob? I thought anything more than a 1 tooth jump would disqualify it.

  18. #18
    Senior Member RobbieTunes's Avatar
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    I rode a 12-21 10-sp today for 55 miles, and paid dearly for it. I could have dropped to the 39t front, but ego demanded otherwise.

    I used to ride a 12-19 8-sp and was fine up to about 40 miles of mash/hash, but after that, it's mash/hash/bonkash.

    They are kind of fun. I put my brother-in-law on one, 13-18 6sp and watched him suffer. Unintentionally, but it was still fairly amusing.

    I have since seen the light, and figure they're somewhat bad for expanding the sport; better left to those who know what they're doing.

    Robbie ♪♫♪...☻

    Perhaps you didn't really hear what you thought I said...
    ...or maybe you did, and that's why you're so mad.


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  19. #19
    Senior Member RobbieTunes's Avatar
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    Quote Originally Posted by zukahn1 View Post
    House of Pain.

    Robbie ♪♫♪...☻

    Perhaps you didn't really hear what you thought I said...
    ...or maybe you did, and that's why you're so mad.


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  20. #20
    Senior Member Eric S.'s Avatar
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    Quote Originally Posted by due ruote View Post
    But I'm wondering for the record, what is the definition of corncob? I thought anything more than a 1 tooth jump would disqualify it.
    Corn cob does indeed imply one-tooth jumps, but they're uncommon for modern gearing/equipment so I'd say the definition has been expanded a bit.

  21. #21
    Hopelessly addicted... photogravity's Avatar
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    Whenever I think of corncobs, I think of this.

    --
    Ridding the world of derailleurs, one bicycle at a time.

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  22. #22
    Junior Member
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    Since moving to the midwest, I found I never needed the 21T top cog on my 8s bike, but a "true" Campy 12-19 8s corn cob is pretty hard to find.

    The solution: I built my own corn cob by taking a 10s Campy 12-23 Veloce cassette (which has all loose cogs), discarding the 21 and 23, and using a Wheels Mfg conversion kit to respace the others for 8s Campy shifting on a 10s rear wheel.

  23. #23
    PanGalacticGargleBlaster Zaphod Beeblebrox's Avatar
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    Quote Originally Posted by Eric S. View Post
    Corn cob does indeed imply one-tooth jumps, but they're uncommon for modern gearing/equipment so I'd say the definition has been expanded a bit.
    That's diplomatic of you. I'd just say people who are calling something other than one-tooth jumps a corncob are wrong.

    Case in point, I run a 14-15-16-17-18-19-21-23-26. Its not a corncob, but the highest 6 gears are spaced the same way.
    --Don't Panic.

  24. #24
    Senior Member Eric S.'s Avatar
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    My comment above about possibly putting a 9-speed 12-21 on my bike only amounts to a 1-tooth violation of a corn cob or straight block. As meticulous as I can be, I'm not picky enough to find a 20T cog (I'm guessing that cassette is 12-13-14-15-16-17-18-19-21).

  25. #25
    Senior Member Robofunc's Avatar
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    I ride a Regina 13,14,15,17,19,21 with 53/42 up front on my main bike. I like it, but I'm in pancake-flat Florida.

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