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Old 05-13-14, 01:01 AM   #1
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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.

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Old 05-13-14, 04:58 AM   #2
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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!
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Old 05-13-14, 05:08 AM   #3
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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.
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Old 05-13-14, 07:33 AM   #4
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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?
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Old 05-13-14, 07:46 AM   #5
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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.
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Old 05-13-14, 08:50 AM   #6
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Florida freewheels!!
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Old 05-13-14, 09:40 AM   #7
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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.

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Old 05-13-14, 09:52 AM   #8
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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.

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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.
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Old 05-13-14, 10:11 AM   #9
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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
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Old 05-13-14, 10:34 AM   #10
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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?
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...
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Old 05-13-14, 10:51 AM   #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.
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Old 05-13-14, 11:12 AM   #12
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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.
+1. My 7sp 13-21 52-42 is ideal for flat country riding, 42/15 and 42/16 most of the time.
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Old 05-13-14, 11:12 AM   #13
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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 ;-)
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Old 05-13-14, 11:16 AM   #14
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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?
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.
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Old 05-13-14, 11:30 AM   #15
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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....
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Old 05-13-14, 01:34 PM   #16
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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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Old 05-13-14, 02:18 PM   #17
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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.
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Old 05-13-14, 02:23 PM   #18
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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.
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Old 05-13-14, 02:27 PM   #19
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Old 05-13-14, 02:34 PM   #20
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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.
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Old 05-13-14, 02:47 PM   #21
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Whenever I think of corncobs, I think of this.

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Old 05-13-14, 05:18 PM   #22
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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.
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Old 05-13-14, 05:20 PM   #23
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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.
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Old 05-13-14, 05:41 PM   #24
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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).
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Old 05-13-14, 05:47 PM   #25
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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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