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Old 04-08-08, 04:30 PM   #1
UnsafeAlpine
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What the F.....?

I wasn't sure if this should go into the A&S forum or the P&R forum or maybe even the S&M forum...oops wrong site. Anyway...

What law of physics forces me OVER the handlebars when my chain breaks and into the middle of traffic where I nearly get my head squished like a watermelon? This hasn't happened just once, but on 4 seperate occasions on 3 different bikes: a 20 incher freestyle bike, a mountain bike, and a road bike. All 4 times, over the damn handlebars. When I was a kid, I just used to squash my...cough....unmentionables. Ah, those were the days...
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Old 04-08-08, 04:45 PM   #2
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I wasn't sure if this should go into the A&S forum or the P&R forum or maybe even the S&M forum...oops wrong site. Anyway...

What law of physics forces me OVER the handlebars when my chain breaks and into the middle of traffic where I nearly get my head squished like a watermelon? This hasn't happened just once, but on 4 seperate occasions on 3 different bikes: a 20 incher freestyle bike, a mountain bike, and a road bike. All 4 times, over the damn handlebars. When I was a kid, I just used to squash my...cough....unmentionables. Ah, those were the days...

Wish I knew the correct formula for this. I know only this: Foot mashing pedals while pulling UP on handlebars and chain breaks midcrank (always always) causes embarrising face plant to concrete. Maybe an Einstein on the forums here knows the true mathamatical formula for this.
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Old 04-08-08, 05:03 PM   #3
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You don't know how to work a bike if that happened 4 times on 3 different bikes.
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Old 04-08-08, 05:11 PM   #4
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I thought I knew how. You grap that big spining thin in front to turn (but you have to be careful, cause if you hold it to long, it burns) while sitting on that long horizontal thing, right? I don't think it's that I don't know how to work a bike, it's more like I don't know how to lube my chain correctly.
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Old 04-08-08, 05:15 PM   #5
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. . .no I don't think it is the lube. How tight/loose is your chain?
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Old 04-08-08, 05:32 PM   #6
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The law of conservation of motion

Basic HS Physics.....that which is in motion tends to remain in motion until the coefficient of drag leaches away enough energy to stop it. The force required to drive the pedals, when your chain breaks tends to throw you forward in a predictable path, ie: forward over the handle bars until you reach the obstruction (The ground )
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Old 04-08-08, 05:41 PM   #7
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Tell Us More, Mister Science! :d
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Old 04-08-08, 05:51 PM   #8
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Sure, the going over the handebar part isn't so bad.....it's the sudden stop when you impact the ground at high speed
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Old 04-08-08, 06:28 PM   #9
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gravity hurts.
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Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
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Old 04-08-08, 06:31 PM   #10
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Happens to me all the time when I am putting out 500W for 10 mins..
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Old 04-09-08, 09:01 AM   #11
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. . .no I don't think it is the lube. How tight/loose is your chain?
The 20 incher was pretty tight, but the chain had a nice patina of rust on it, and the other bikes were rear derailluer tight.
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Old 04-09-08, 10:59 AM   #12
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Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
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Old 04-09-08, 11:01 AM   #13
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Would Wipperman stainless steel chains be immune to this type of breakage?
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Old 04-09-08, 11:17 AM   #14
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How long did you ride on the same chain. I've broken one chain. Check them every 1000 miles or so with a checker or by measuring. You'll avoid this happening.

That or learn to control your epic guads.
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Old 04-09-08, 11:21 AM   #15
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I think you may want to invest in a better chain break, or use the removable links. If you are not doing your own chain installs, I would say switch shops, because someone is doing something wrong.

I am pretty stout, never really been below 200 lb. since I started riding, and I have never broken a chain while riding.
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Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
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Old 04-09-08, 11:39 AM   #16
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I think it's that my bikes are forced to sit outside, and with 6 bikes, they sometimes get ridden infrequently. I'm going to start chainging my care of them, and I also have switched to Sram chains. I dislike shimano with there forced replacement pins and no removable links. stupid shimano.
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Old 04-09-08, 11:52 AM   #17
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SRAM is always good, especially that all but their high end road chains have master links.

I still wonder if the stainless steel chains will be a good solution, especially if you are near a body of salt water and corrosion is a problem.
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