knievel Posted February 19, 2009 Share I have been having some issues with the chain on my Trek 4500 so i went and bought a new one and popped that on. I measured it against the old one and the links didn't line up exactly but i thought i would try it anyway. Did they give me the wrong chain? It seems identical. It was not a big difference Problem is now every time i pedal it jumps. The lady at linden said if my old chain had worn the rear sprockets i might need to replace them. Is this what i need to do? What will that cost? Link to comment Share on other sites More sharing options...
AndreZA Posted February 19, 2009 Share If the old chain have "streched" that you can can see it compared to the new one, then the chances are good that the casette could also be worn. Link to comment Share on other sites More sharing options...
Wyatt Earp Posted February 19, 2009 Share ..............aaaand possibly even a chain blade or two depending on the mileage. Link to comment Share on other sites More sharing options...
Master216 Posted February 19, 2009 Share Chain rings, cassette and jockey wheels prob need replacing!!!use a chain tool to measure how far gone the old chain was and then if it was completely worn you will know all of the above needs replacing or not! Link to comment Share on other sites More sharing options...
AndreZA Posted February 19, 2009 Share Chain rings' date=' cassette and jockey wheels prob need replacing!!!use a chain tool to measure how far gone the old chain was and then if it was completely worn you will know all of the above needs replacing or not![/quote'] not jockey wheels. Those things last for 50 000km on a road bike. Chain tool is also crap. Get an inch ruler and use the 12 inch 24 link method. Link to comment Share on other sites More sharing options...
knievel Posted February 19, 2009 Share 12 inch 24 link method??? I assume that there should be 24 links in 12 inches... correct? Anothr issue i have been having is that the chain gets stuck in between the front sprockets. Why is this happening? It takes forever to get it out and is a complete pain in the ass. The teeth on the rear sprockets (Casette???) look slightly worn but im not sure if that means anything. Link to comment Share on other sites More sharing options...
Johan Bornman Posted February 19, 2009 Share Chain rings' date=' cassette and jockey wheels prob need replacing!!!use a chain tool to measure how far gone the old chain was and then if it was completely worn you will know all of the above needs replacing or not![/quote'] Oh Rubbish! You just made that up. Jockey wheels are just idlers and can take an inordinate amount of wear before they need replacing. Even then, they don't bring about any type of problems with either shifting or chain longevity. Further, a worn chain will not damage a chainring, althougth it will damage a cassette. The big difference between a cassette and a chainring is that the former is a driven sprocket and the latter a driving sprocket. The difference in that lies with entering the sprocket under tension or under slack. But I see you're not the only one capable of offering dodgy advice. You have some friends here. It is rubbish like this that perpetuate all the myths about chain wear and the bike shops love it, they make money out of BS like this. Link to comment Share on other sites More sharing options...
quickdraw Posted February 19, 2009 Share How do chainrings wear? Link to comment Share on other sites More sharing options...
Guest Big H Posted February 19, 2009 Share 12 inch 24 link method???I assume that there should be 24 links in 12 inches... correct?Anothr issue i have been having is that the chain gets stuck in between the front sprockets. Why is this happening? It takes forever to get it out and is a complete pain in the ass. The teeth on the rear sprockets (Casette???) look slightly worn but im not sure if that means anything. You cannot see if a cassette is "slightly" worn. You will only notice wear if you place it next to a new cassette and then you still have to look very closely. There are 12 links in 12" of bicycle chain. One link is one inch long. A link is the narrow part, as well as the wider part of the chain, that makes one link. Link to comment Share on other sites More sharing options...
Master216 Posted February 19, 2009 Share Tisk Tisk!!If you dont wanna hassle replace all of it!!Agreed Jockey wheels are the last thing to go on a drivetrain with regards to wear and tear, worn chain rings dont cause gears skipping but if your chain rings are worn badly then replacing a chain wont help for long as the chainrings will wear down the chain rather quickly and hence wear down your cassette.Generally i replace Jockey wheels, chainrings and cassette at same time and replace a chain every few months. Link to comment Share on other sites More sharing options...
Master216 Posted February 19, 2009 Share so to the original question, with the replaced chain, replace your cassette as well, and only your chain rings if they are looking sharp with a U shaped groove between them. Link to comment Share on other sites More sharing options...
Johan Bornman Posted February 19, 2009 Share How do chainrings wear? They wear, like all sprockets on their pressure faces. When looking at your front and rear sprockets from the saddle position, the rear sprockets wear on the forward pressure faces and the chainrings (front sprockets) on the rear faces. Wear in a front and rear sprocket looks completely different. A rear sprocket wears by widening the U between teeth whilst a front sprocket wears by eroding the tooth from the root. Search for an article I posted here some time ago. Keywords"Everything about chains" should produce it. Link to comment Share on other sites More sharing options...
Mlayne Posted February 19, 2009 Share I recently had a similar problem when the bike shop replaced my wifes chain, after about three hours and slipping chain, and getting stuck between chain blades in the front, turns out they sold us 10 speed 105 chain to fit on a 9 speed tiagra setup. Chain was too narrow and got stuck on the front and did not quite get hooked on the back. SO probably have wrong speed chain. Problem solved. Link to comment Share on other sites More sharing options...
Johan Bornman Posted February 19, 2009 Share I have been having some issues with the chain on my Trek 4500 so i went and bought a new one and popped that on. I measured it against the old one and the links didn't line up exactly but i thought i would try it anyway. Did they give me the wrong chain? It seems identical. It was not a big differenceProblem is now every time i pedal it jumps. The lady at linden said if my old chain had worn the rear sprockets i might need to replace them. Is this what i need to do?What will that cost? What you saw when you laid the two chains against each other is elongation in the used chain from wear in the pins. This is natural and a function of hygiene, load, sprocket sizes and distrance travelled. A new chain is shorter, but the difference can only be seen over a long piece of chain, as you observed. If a cassette is worn, a new chain will skip in your favourite gears. This simply means the cassette is now worn and needs replacememt. It is expensive but can be contained by buying cheap chain and cassettes from lower groupsets (i.e. 105 instead of Dura Ace). Their functionality is the same but weight and shinyness differs. The trick is to replace your chain before it starts to do damage to the sprocket. You'll find instructins on this forum. Search for 12 inches or chain elongation. Link to comment Share on other sites More sharing options...
The_Break Posted February 19, 2009 Share You mean the chain stretched right Johan? Link to comment Share on other sites More sharing options...
knersis Posted February 19, 2009 Share Think Johan's hand is gonna strech and give you a snotklap elongation not equal to stretching. knersis2009-02-19 08:37:49 Link to comment Share on other sites More sharing options...
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