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  1. #1
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    aluminum chain-rings

    hello. anyone tried a chain-ring made of 6061-t6 aluminum?? I want to know how many miles you guys got out of it before it got worn???

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    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by SimonLee View Post
    hello. anyone tried a chain-ring made of 6061-t6 aluminum?? I want to know how many miles you guys got out of it before it got worn???
    I can't say for sure what my aluminum chainrings are made of but they last, roughly, forever. It's standard practice to replace the smallest inner one on a triple with a steel ring because they wear faster but we're still talking years to wear one out. The aluminum inner rings usually get bent before they wear out.
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    do you know the brand of yours?? my aluminum chain-ring is a 48T got it for like $32 buxs total with tax+shipping fees. and mines is for the biggest on a triple crankset.

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    Super Moderator no1mad's Avatar
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    Question: Do you know if your chainrings are riveted or not. Lower end tends to not make replacing individual rings possible...
    Quote Originally Posted by Cyril View Post
    Ride what and in what manner pleases you. Those that mind don't matter, and those that matter don't mind. srsly.
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    Don't know the grade of Al in my chain rings either. The one that wore out was the large ring (52T) which is the one I use most often. It first developed skipping problems due to wear around 60 kmiles. At that point I flipped it over and used it for more than 30 kmiles at which point the chain again started to skip when accelerating. So the total was between 90 and 100 kmiles.

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    coprolite fietsbob's Avatar
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    Well did you regularly replace the chain? how often? keep it clean and lubricated?

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    Quote Originally Posted by fietsbob View Post
    Well did you regularly replace the chain? how often? keep it clean and lubricated?
    Why? Do you consider 100 kmiles to be premature wear? Seems like false economy to try to get a little more life out of a chain ring by replacing chains more often than might be necessary. My chains (cheap KMCs or eq.) generally last about 6 kmiles and the cassettes make it through about four chains.

  8. #8
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by SimonLee View Post
    do you know the brand of yours?? my aluminum chain-ring is a 48T got it for like $32 buxs total with tax+shipping fees. and mines is for the biggest on a triple crankset.
    I've had all kinds of brands over 30+ years. The max size of the chainring is dependent, largely, on the bolt circle diameter(BCD). There's no real reason that a 104mm BCD to be limited to 48 teeth but that's the way it is. Here's a 50 tooth outer ring if you really think you need something larger than a 48 tooth. On a mountain bike, however, a 48 tooth outer and an 11 tooth cassette cog works out to a 114" gear which is rather tall. A 50x11 works out to a 118" gear. That takes some serious leg power to turn over.
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    what do you mean riveted?? I forgot to mention I have the Origin-8 chainrings.

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    my chain-rings and bike chain is new. I replace it when it is worn like about .75 wear and I do lubricate it only when I hear sound or when I ride enough to know that my chain is dry or needs lubricant.

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    hey cyc. I'm not sure but looks like the biggest chainring I could get is a 48T for my hybrid bike because my bcd is not even 104mm but its a 94mm or maybe it can fit 104mm since I do see another 4 holes on my middle chainring maybe that is the 104mm??

    also the chainring bolts that is fitted to fit on 94mm hole doesnt fit the 104mm. it looks like the 104mm bcd needs smaller chainring size bolts??? do they come in another size ??

    also my bike is converted into single speed and i do have a 11 tooth cassette cog with a lockring that is left on to the hub needed to create the perfect chainline. i was wondering if i purchase a new 11 tooth cassette will it work. the chain i'm using is 1/8 chain and i dont think it will work with the 11T cassette cog.

    also thanks for the link.

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    90-100 kmiles is not a lot. i don't ride that hard unless it's up a hill.

  13. #13
    Humvee of bikes =Worksman Nightshade's Avatar
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    Quote Originally Posted by cyccommute View Post
    I can't say for sure what my aluminum chainrings are made of but they last, roughly, forever. It's standard practice to replace the smallest inner one on a triple with a steel ring because they wear faster but we're still talking years to wear one out. The aluminum inner rings usually get bent before they wear out.
    Wouldn't the amount of use per chainring have a lot to do with wear patterns??
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    Steel: nearly a thousand years of metallurgical development
    Aluminum: barely a hundred, which one would you rather have under your butt at 30mph?

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    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by Nightshade View Post
    Wouldn't the amount of use per chainring have a lot to do with wear patterns??
    Not completely. Chainrings smaller than around 24 teeth experience a lot of torque and tend to wear faster. And the smaller rings are usually shifted under load which tends to bend teeth.
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    Senior Member wahoonc's Avatar
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    Most of the ones I have seen are made out of 6061 alloy which is pretty tough stuff. Yes they will wear out...eventually. How quickly depends on a variety of factors. In 40 years of cycling I can only recall replacing one alloy ring due to wear, it was the middle ring and I was pretty slack about keeping the drive train clean on that bike.

    I have steel ones that have no measurable wear after 30,000+ miles of riding, but the rear steel cog is showing wear. FWIW that bike only on it's third chain that I know of, and advantage of an IGH.

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    This page gives the common crank/chainring BCD's-
    http://sheldonbrown.com/harris/chainrings.html

    If you ever want to run a HUGE chainring, Hostel Shoppe sells the Vuelta rings in 110 and 130mm, all the way up to 60T - plus a 130mm/65T and a 130mm/73T listed under "specialty chainrings".
    Course you get derailler issues along the way, but oh well. Or you can HTFU and just go with 1 chainring .

    htXXXXtp://www.hostelshoppe.com/cgi-bin/search.pl?category=605000

    Do note: Hostel Shoppe's site has been showing up as an attack site on Google for a couple weeks now. The site owners are aware of the issue.
    If you want to look, I'd suggest Firefox with NoScript. I just visited and got the Google and the Firefox warning, but MSIE said nothing.

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    how much is 90-100 kmiles equal to in miles??

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    hey cyc so bigger chainring will last longer than the grannie or middle chainring?? i'm riding on a 48/ 14 rear cog now.

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    thanks for link Doug. I didn't know 60T and 73T can be found online lol. It looks like 50T is biggest I can go for my hybrid bike since anything bigger might get in the way of the frame unless I get a longer spindle and my BCD is 94mm if bcd was bigger than 94mm then I have more options.

  20. #20
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    Today I was riding my bike and after every 3 full pedal rotation I feel like something is skipping. My chain is new and chain-rings are also. Could it be that the chain-ring might have been bent or the teeth that it comes in isn't as deeply made or as sharp as my old chainring which is made of steel and still in good condition.

    also when i'm walking my bike while the wheel turns I hear clicking sounds could it be something with my rear hub bearing or loose spokes on back wheel? Thanks for anyone help.

  21. #21
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    Quote Originally Posted by SimonLee View Post
    how much is 90-100 kmiles equal to in miles??
    k stands for 'kilo' or 1000, so 90,000 - 100,000 miles.

  22. #22
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    wow that is alot i don't think a steel chain-ring will even last that long lols.

  23. #23
    Bike ≠ Car ≠ Ped. BarracksSi's Avatar
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    Quote Originally Posted by prathmann View Post
    k stands for 'kilo' or 1000, so 90,000 - 100,000 miles.
    I was gonna say, I was starting to wonder who this guy was and why we haven't heard about him on TV yet. At his pace he could ride to the moon in our lifetime.

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    Quote Originally Posted by SimonLee View Post
    thanks for link Doug. I didn't know 60T and 73T can be found online lol. It looks like 50T is biggest I can go for my hybrid bike since anything bigger might get in the way of the frame unless I get a longer spindle and my BCD is 94mm if bcd was bigger than 94mm then I have more options.
    If I remember right, the 60 and 73's are paired for a trike that has 305mm/16" wheels all around. Those rings put it into the usual gear-inch range for a normal size rear wheel.

    There USED to be a whopping 90T from that site for something,,,, but I can't recall what it was for.

  25. #25
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    I don't ride a great many miles, can't say how many. I did notice some premature wear on the 52t ring, was wearing along the outboard side of the teeth. What happened was the chain got gritty and I was using the big ring with the middle cogs of the 14-28 6 speed. Apparently the chain alignment was not quite right for that. As a result, will stay with the 40t almost always, and reserve the 52t for 'overdrive' mainly for use with the smallest two cogs.

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