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Old 02-01-05 | 10:07 PM
  #51  
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Originally Posted by bostontrevor
Argh. Apparently it was a mistake to use the 100% thing as an example.

It's common in physics to first consider an ideal system and proceed from there to the real world. I wasn't saying a real-world drivetrain is 100% efficient. I was considering the ideal drivetrain which is to first illustrate the state we are approximating with our actual bicycles.

In doing so we see that as efficiency goes up, so too does friction (and thus wear) diminish. That's all.
OK. Sorry. I was a bit too sarcastic. Practically everyone who mountain bikes has personal experience with running a chain dry and feels (as well as hears) the difference after they lubricate it. I can't just ignore what actual experience has taught me because of the results of a lab test. To me, when you describe the noise that needed to be dampened, it's just what happens when there is no film of lubrication between the moving parts and you have metal riding on metal. I may be over-simplifying, and I am not any kind of physics expert, but (until now) I never thought there was any question about whether or not to lube the chain--just a lot of opinions about what works best.
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Old 02-01-05 | 10:24 PM
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Originally Posted by bostontrevor
Argh.

It's common in physics to first consider an ideal system and proceed from there to the real world.
But what if you can never find the door?
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Old 02-01-05 | 10:26 PM
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Originally Posted by sydney
But what if you can never find the door?
You obviously have this problem....
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Old 02-02-05 | 10:08 PM
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You don't need to grease bolts ; they are designed to work when dry.

What's wrong with oiling the chain, it's only a one-speed bike it hardly makes any difference to the efiiciency.

Try to ride a bike that has been sitting out in the paddock for 10 years and has a completely dry chain and you'll find out why they need to be lubricated.
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Old 02-02-05 | 10:51 PM
  #55  
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Originally Posted by john999
You don't need to grease bolts ; they are designed to work when dry..
Wrong! Each bolt and nut or threaded part such as a pedal needs to be lubricated to allow the proper torque to be reached and prevent corrosion. You wouldn't think so, but grease allows a bolt to be torqued easier and stay tight better than a dry bolt.
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Old 02-03-05 | 08:37 AM
  #56  
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Originally Posted by john999
You don't need to grease bolts ; they are designed to work when dry.
Why don't you go to www.parktool.com and bone up so you can give better advice. I think they know more about it than you seem to.
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Old 02-03-05 | 09:23 AM
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Originally Posted by Raiyn
Wrong! Each bolt and nut or threaded part such as a pedal needs to be lubricated to allow the proper torque to be reached and prevent corrosion. You wouldn't think so, but grease allows a bolt to be torqued easier and stay tight better than a dry bolt.
Correct and it also works as anti-sieze to a degree.
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Old 02-03-05 | 09:55 AM
  #58  
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Originally Posted by john999
You don't need to grease bolts ; they are designed to work when dry.
Try to ride a bike that has been sitting out in the paddock for 10 years and has a completely dry chain and you'll find out why they need to be lubricated.
Take that same bike and imagine it was built up without the use of grease on any of the bolt threads. Wonder if you could actually turn any of those bolts now.
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Old 02-04-05 | 02:17 AM
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I still don't reckon its a good idea to grease the axles on the threads ; it attracts dirt just where you don't want it - near the bearings. Maybe OK if you have sealed bearings, not a BMX.
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Old 02-04-05 | 11:43 PM
  #60  
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Originally Posted by john999
I still don't reckon its a good idea to grease the axles on the threads ; it attracts dirt just where you don't want it - near the bearings. Maybe OK if you have sealed bearings, not a BMX.
It makes it so much easier to adjust your hubs though.
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Old 02-04-05 | 11:53 PM
  #61  
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Originally Posted by john999
You don't need to grease bolts ; they are designed to work when dry.
I bet everyone can hear you coming a mile away... squeeeak creeeak creeeak oh hey its John!
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