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Old 09-21-08, 08:56 PM   #1
BengeBoy 
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Why, yes, I *am* a mechanical genius....

As I grow ever-more fond of my vintage Univega touring/commuting bike, I decided it was time to jettison the oh-so-funky oblong Biopace chainrings and do some other maintenance upgrades as well.

I bought a new crankarm puller, and Friday night/Saturday morning I:


- took off the crankarm, installed the 3 new chainrings, re-installed the crank arm
- replaced the chain
- tuned up the derailleurs
- fixed a couple of loose screws on a fender
- checked the tire pressure and aired up the tires.

I then took off for a test ride, only to quickly discover that it didn't feel "quite right."

Once I took a look at the bike, and discovered my bone-headed mistake, I decided to grab a camera to document my achievement:



Last edited by BengeBoy; 09-21-08 at 09:18 PM.
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Old 09-21-08, 09:11 PM   #2
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I like the look! Harley-Davidson has been using it for years with great success.

Don
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Old 09-21-08, 09:12 PM   #3
JanMM
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Sheer genius!
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Old 09-21-08, 09:29 PM   #4
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Old 09-22-08, 04:16 AM   #5
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Great for a lower center of gravity. Your friends will think you slightly eccentric however.
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Old 09-22-08, 04:49 AM   #6
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I like It!
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Old 09-22-08, 05:37 AM   #7
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Gets rid of the dead spot on the top of the pedal stroke. Now, if you could just figure out something for getting rid of the dead spot at the bottom of the stroke you'd be all set.
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Old 09-22-08, 05:45 AM   #8
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Make sure you store those biopace away nicely. Or sell them on ebay. They're tre-desirable.
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Old 09-22-08, 07:01 AM   #9
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Gonna have to limit the beer intake the next time you wrench on your bike!
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Old 09-22-08, 10:18 AM   #10
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I've seen that done before. Not by me of course, but some of the other guys.
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Old 09-22-08, 10:20 AM   #11
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Wow, that's even more radical than the Biopace chainrings.
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Old 09-22-08, 10:27 AM   #12
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Now if you were clipless- You could pedal in 3/4 circles.
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Old 09-22-08, 10:39 AM   #13
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Another happy graduate of the Three Stooges Cycling Academy. Woop! Woop! Nyuk Nyuk
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Old 09-22-08, 10:57 AM   #14
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BRILLiant!
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Old 09-22-08, 12:54 PM   #15
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I sure wish I could see the images from work... I'll assume you did something like I would do until I see the pic.
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Old 09-22-08, 01:00 PM   #16
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Quote:
Originally Posted by molarface View Post
I like the look! Harley-Davidson has been using it for years with great success.

Don
That was my first thought as well
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Old 09-22-08, 01:36 PM   #17
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I like the look! Harley-Davidson has been using it for years with great success.

Don
Yes, both cylinders hitting on the same stroke. Marvelous engineering.
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Old 09-23-08, 02:03 PM   #18
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This reminds me of the debate on tandems -- should captain and stoker be in phase, per convention, or 90 degrees out of phase, to operate like a 4-cylinder engine?
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Old 09-23-08, 02:16 PM   #19
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Old 09-23-08, 02:55 PM   #20
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Been there.
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Old 09-23-08, 03:22 PM   #21
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This reminds me of the debate on tandems -- should captain and stoker be in phase, per convention, or 90 degrees out of phase, to operate like a 4-cylinder engine?
And the debate goes on.We tried it and it did not work for us but if we wanted "Extra" speed- Pilot and stoker worked with one pushing down on the pedals and one pulling up. Had to switch over about every minute or so but for the Extra turn of speed for 5 minutes or so, it did work.
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Old 09-23-08, 04:18 PM   #22
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Cool idea but you need a different bicycle to pull it off.

See if you can find one of those vintage Roy Rogers bikes and set the cranks up that way. It'll give you the feeling of a galloping horse the way that we used to do when we were kids.
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Old 09-23-08, 04:20 PM   #23
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Sure makes it easier to stand up on while coasting!
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Old 09-23-08, 04:43 PM   #24
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If I posted a picture here of every fix-it job that I screwed up, it would make for a large photo album. I get so tired of it. I can almost always get it right eventually, but I'm just not attentive enough. I can see myself doing exactly what you did.

I wish I could say that looking at your pic makes me feel better ... but it doesn't. But it did make me laugh.
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Old 09-23-08, 05:38 PM   #25
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I think for that set up to work, both pedals have to be on the same side of the bike.
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