What Is Chain Stretch? What causes it?
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- čas přidán 1. 06. 2024
- I explain what "chain stretch" is, or rather what it isn't, and show what causes it.
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Lots of people have tried to explain what chain stretch is. This is by FAR the best explanation I've seen. Thanks RJ!
Legs definitely do not have the kind of power it takes to actually stretch steel, even mild steel.
Agreed. One consequence of wear is a higher bending of the chain. This results in poor shifting. In my experience this is more convincing to many to exchange their chain.
Long ago, when I was putting a lot of miles on '70s era motorcycles, I bought bulk chain from the local farm supply. My friends kept telling me it was somehow inferior to what they got from the dealer. The thing is, while I was wearing out four $7 chains, they were wearing out two $30 chains and a $150 set of sprockets. They were slow to replace that expensive chain when it started to get worn.
That was a great explanation. I knew about chain stretch for years, only as a term. Very educational. Thank you RJ!
Great depiction! As they say, you know you understand something fully when you can explain it so a 5 year old can understand.
Great video. Also important to note that those moving contact area's are where the lube is needed most. So many people tend to think like they need to be "painting the plates", but its the contact points that count.
that's a good explanation, and the wood mock-up may help correct those who might believe chain stretch is the steel stretching under stress or repeated use. however, i would clarify that serious hill climbing is going to cause chain 'stretch' much more rapidly than normal riding. this is because friction at the wear points you've shown us increases with pressure. so i would say the factors that affect chain wear are 1) cleanliness, 2) lube, 3) riding style, and 4) metallurgy of the chain material
Wow - that's the best explanation I've ever seen. Love the wooden mock up example to show what's really happening.
For a new person into MTB this was the best easiest explanation than other videos and straight to the point . Other videos took 3-4 min before they start to explain shit
That explains a lot! I was arguing with a friend that there is no way it can actually "stretch" , but he was adamant that the term is correct. :)
For chains to actually stretch, the tension in the chain would have to exceed the yield strength of the steel. One could calculate this, but there is an easier observation that demonstrates it is not happening. Steel that is repeatedly taken past its yield strength, particularly if their is any corrosive environment involved, will eventually develop stress fractures and fail. Chain “stretch” is common, but outright chain failure is rare. If chains were actually stretching, we should have frequent reports of heavier, stronger riders snapping chains, particularly those that use the lightest weight chains, in the lowest gears, pushing up the steepest hills in seaside or wet climates.
@@markholm7050 stop showing off
Maybe he was just "pulling your leg?" Enjoy. Tip your wait staff. G'nite ladies and gents.
@@markholm7050 "Riveting" story.
It’s called Chain "Stretch" but this isn't the best nomenclature which causes confusion. Chain wear is a more accurate description
Beautiful demonstration!
I actually have one chain with wear so bad like demonstrated here. The casette on one ring is already badly damaged.
Brilliant. I’ve never gone through the theory behind chain-wear tools. Didn’t even know what the tool is supposed to measure. But this is a video à la RJ The Bike Guy: so clear, no fancy talking, sales talk. And the mockup: an image says more than a 1000 words. Thanks RJ! 👍
Excellent visual aid.
Also very relevant to motorcycle chains, where it's easier/more comfortable to believe your 200hp superbike is stretching the chain, than that your lack of maintenance is sending it to an early grave.
This is a great illustration of why you have to keep your chain clean and lubed. Thanks, RJ!
Wow! RJ you have moved to new level here. You made props! This is some Alton Brown level action of explanation. Hands down the best video on chain stretch on CZcams!
I love it! I built the same sort of visual aid for my mechanics class two years ago. You put a lot more work into your wooden example--mine is just coroplast 'plates' and a binding post.
I had scrap wood and a scroll saw. And a drill press, and arbor bits. I actually have a lot of non-bike tools too. :D
There is also a small amount of wear on the rollers from meshing with the gears. But this is the pefect explanation for what people call "stretch"
Very true. You can even see this if you have cleaned a worn out chain. The rollers are not round any more.
Never have I clicked on a video faster. Another masterpiece 👍
Nice explanation and having the large chain model was a great idea. It's too bad people started calling it chain stretch to begin with... a misnomer!
I never go anywhere else for help always easy to understand thank you.
Best teacher ever ! Watching you since 3 or 4 years, sir. :)
I appreciate the effort and time needed to build those plywood oversized chain links. A drawing could have worked but no you went the extra mile, thank you for that.
Great illustration of chain “stretch”.
Great explanation of chain "stretch" one thing that should be mentioned because so many people fall foul of this: *ALL 11 speed and over systems no matter how many chainrings and all very wide range MTB 1x systems (11-48+)* MUST have the chain replaced at 0.5% if you go to 0.75 on these systems you might as well replace the cassette at the same time.
Systems with a cassette of 10 cogs or less and low range 1x systems are fine to 0.75 and the cassette is ruined at 1%.
Ahh so that’s why my 10 year old chain works fine on my 3x7
@@MrFitness94 Yeah, not only does fewer gears/smaller range mean your chain can take more wear before it needs replacing, it will take way longer to reach that point. Also what can happen with older systems is that the whole drivetrain kind of wears in unison and continues to work even when it has gone past even the 1% mark. The only trade off is you might find when the chain does eventually fail you will have to replace the rest of the drivetrain because the teeth profiles on your cassette/freewheel chainrings and even jockey wheels are no longer a match for any new chain in existence LOL.
@@chris1275cc i can believe it. The whole drivetrain is probably cooked but it works amazing.
The easiets way to explain I could imagine! thank you!
RJ that’s the way you explain chain wear.I watched even though I already knew but always enjoy your videos you always go that extra mile like with the mock up.
Great demo!
Love the mock up. Great vid!
Fantastic explanation! Great job.
Great explanation, thanks!!
No wonder my chains wear out faster in the winter when the roads are wet and muddy. Great explanation.
Thank you for the information have a great 2022.
very informative video. Thanks!
Fantastic explanation!
Nice to see ya back the bike guy.
Great video on the explanation of chain "wear". I would add that if a chain has extreme wear and is replaced with a new one, chances are the freewheel or cassette should be replaced at the same time or you'll get chain skipping especially on the smaller cogs where there is less wrap around on the cogs.
Some people falsely claim that new shift and brake cables "stretch" that is wrong, what happens is cables have to seat and compress the housing several times which sometimes requires you to adjust the cable anchor clamp bolt until it stops. Take care!
This is the best explanation I’ve found so far! Very helpful
Awesome explanation RJ!
Great illustration! Thanks RJ.
Very informative and great use of a mock up. Thank you Bike Guy.
Well explained and demonstrated
Excellent explanation! Thank you
nice explanation. Thank you
Great simple explanation!
great video, great explanation!
A great explanation. Thank you!
Excellent explanation of a worn chain
Very good explanation!
Good job. You nailed it. Thanks for the video.....
very well explained.... nice chain mock-up!
Excellent video and explanation.
Excellent explanation RJ. Thanks!
What a great way to show and explain!
Great description and visual of the topic!👍🏻
Great explanation on chain wear. Thank you.
Great explanation and demonstration!
Very nicely explained! Thank you 👍🏼
great visual explanation of chain stretch, rj!
Thx for the video man and happy New year
Excellent explanation, as always
Brilliance! Well done, sir.
great info thanks
I was one of those folks that thought I was putting down so much power I was stretching the chain. This video corrected by delusions of grandeur. Thanks for dragging me back to planet earth.
Seriously….great video. I especially liked the visual you made. GCN would of simply made a fancy graphic, but I prefer the practical effects.
Great video!!! Thank u. Simple but very well explained.
A brilliant explanation.
Excellent video.
Great video! Thanks
Your videos very informative.Keep going on.Good luck.
Best explanation ever. Thank you
Best explanation on chain wear. Thanks for the effort!
We stopped using that term in my bike shop because people would think about it too litterally, its wear on the chain, not stretch.
Same here, there were far too many pedantic people willing to argue over semantics.
Perfect explanation
Nice explanation ...great hand-made model!
Thanks Regular Guy J the bike guy for all the great video's
Marvellous video demonstration and mock up model! Thanks RJ.
Excellent explanation, the best I've seen so far.
I'm always learning stuff from this channel. Thanks RJ.
Very great explanation and demonstration, thanks. Have a nice day.
I’m glad to see you getting your hands dirty. Most CZcams mechanics wear rubber gloves to keep their delicate hands clean. Thanks RJ for keeping it real and very informative.
Great illustration with your wooden pieces. Keep up the great work as always
Way to go, RJ !!! As usual, a "picture" (or model) is worth a thousand words. So, if someone asks me how a chain can "stretch", I'll just refer him to your vid.
Nice job RJ.
Thank you for the explanation🔧🔧🔧
Good Work. Thank you
Best explanation !
Thanks for posting this. Very good demo and very informative. Love your woodshop example!
Great video!
I really appreciate the effort you put in to make this video, very helpful!
Such a great explanation.
Thanks RJ. 👌
Keep up the fantastic work. 👏
Superb explanation
Well done , best video ever on the chain stretch , enjoy the effects you put in . 👍🏾👍🏾
Another excellent video RJ, I never saw a better explanation. Thanks 👍👍
Thanks for the video👍
Very well explained!! Great presentation on a common problem. Keep up the vids.
That cleared it up for me. Thank you
Best explanation ever!
Been searching for this specific content. Thanks alot
Great visual aid, clarifies stretch easily
Just fantastic, sublime , RJ is simply the best in his game 🙏
I agree with Joel, by far the best video explaining chain stretch thank you
Thanks, that was a very good explanation and illustration. 💯