Quiz time: What logo is this?
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Quiz time: What logo is this?
Hi all,
I've just bought a second hand bike that needs some work. I want to add a new chainring but I have no idea what brand it is. Theres no writing on it, just the logo. Anyone know what brand this is?
(And anyone know if I can get a new ring for it?)
Thanks
Rob
I've just bought a second hand bike that needs some work. I want to add a new chainring but I have no idea what brand it is. Theres no writing on it, just the logo. Anyone know what brand this is?
(And anyone know if I can get a new ring for it?)
Thanks
Rob
#2
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The brand is not important, you just need to know what the BCD (bolt circle diameter) of the crank is. It looks like a 4-bolt design, so just measure the distance between the center of two opposite bolts. Then buy a new chainring with the same BCD and it should work. I seriously doubt that you'd be able to find a ring from the same brand, even if you are able to discover what brand the crank is.
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Brand doesn't usually matter, but there are exceptions, where sometimes you might occasionally need to file the inner edges of chainrings to match or at least miss the shoulders on crank arms. If it's an issue it's usually the outer, sometimes the middle and never the granny.
Criss's advice to measure the on center diagonal works with 4-bolt systems, but if yours has 5 bolts, it's a bit trickier since there's no way to directly measure the diameter. Instead you measure the on-center distance between two adjacent holes and multiply by 1.7 to get the diameter. No great precision is need since there are only certain options, usually 110 or 130 as shown on this list of all possibilities.
Also
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FB
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
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Thanks for all your replies.
I'm now not sure if its the chainring that needs replacing or the chain (or both!). When comparing the chain to a new one, the old chain is visibly longer over just 5 or 6 links! (You can see from the photo where the chain is slack around the chainring) Do chains actually stretch?
Oh, and mechBgon - thanks for that. And apparently, Icon is a brand name for Trek. You get the bonus point
I'm now not sure if its the chainring that needs replacing or the chain (or both!). When comparing the chain to a new one, the old chain is visibly longer over just 5 or 6 links! (You can see from the photo where the chain is slack around the chainring) Do chains actually stretch?
Oh, and mechBgon - thanks for that. And apparently, Icon is a brand name for Trek. You get the bonus point
Last edited by robgod; 09-24-11 at 06:19 PM.
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Thanks for all your replies.
I'm now not sure if its the chainring that needs replacing or the chain (or both!). When comparing the chain to a new one, the old chain is visibly longer over just 5 or 6 links! (You can see from the photo where the chain is slack around the chainring) Do chains actually stretch?
Oh, and mechBgon - thanks for that. And apparently, Icon is a brand name for Trek. You get the bonus point
I'm now not sure if its the chainring that needs replacing or the chain (or both!). When comparing the chain to a new one, the old chain is visibly longer over just 5 or 6 links! (You can see from the photo where the chain is slack around the chainring) Do chains actually stretch?
Oh, and mechBgon - thanks for that. And apparently, Icon is a brand name for Trek. You get the bonus point
In your shoes, I'd replace the chain first, and then the chainring and possibly the cassette if necessary. Necessary meaning that the new chain skips under load.
For future reference, measure your chain and when 24 links which should measure 12" "stretches" out to 12-1/16. Rerplacing the chain before it's worn too far, saves the cassettes and chainrings.
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FB
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
#7
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Looks as if the large chainring is integrated into the crankarm. Am I seeing that right?
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