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Old 01-18-10, 10:59 AM   #1
Jakedatc
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Chain rings for shimano deore triple

On my winter/rain bike i have a deore touring triple.. 50-44-28. I would really like to put a 36t middle ring to make the shifts more spaced out and be more useful. I cannot find the bolt spacing stamped anywhere. it is a 5 bolt pattern though. 7 speed rear if that matters.

any help on where to find a new ring would be great.



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Old 01-18-10, 11:12 AM   #2
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ever heard of a ruler?? prob 110 bcd or 94
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Old 01-18-10, 11:21 AM   #3
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Oops. checked Sheldon's site. 110 bcd sorry.. mostly looking for where to get a ring that will fit. I don't have an LBS near me that carries parts so i need to order the correct one online
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Old 01-18-10, 11:28 AM   #4
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http://www.treefortbikes.com/324_333...Chainring.html this is what i'm leaning towards..
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Old 01-18-10, 02:00 PM   #5
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Does it matter if it's 9-10 speed or meant for a double compact as long as it is 110 bcd?
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Old 01-18-10, 08:03 PM   #6
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Quote:
Originally Posted by Jakedatc View Post
Does it matter if it's 9-10 speed or meant for a double compact as long as it is 110 bcd?
No. 110mm BCD is 110mm BCD. (Except for Campy compact.) 9/10 speed rings may be configured to have a smaller gap between the adjoining rings, which may or may not affect you.

However, if I understand your original post, you're looking at making a 28-36-50 triple. This may not work because the chain will want to shift from the granny to the big chainring without landing on the middle. This is because the front derailleur pushes the chain sideways, and with those chainrings it'll contact the big ring as well as the middle. You'll end up making a double shift: granny-to-big then big-to-middle when you want to just go to the middle ring. This is annoying and frustrating.

Shimano sold those cranks in a couple different configurations originally: 26-36-46, 28-38-48, and 28-44-50, IIRC. If you want a smaller middle ring, you should seriously consider putting a smaller outer ring also.
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Old 01-18-10, 10:27 PM   #7
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Here is a ring that will work. http://www.rivbike.com/products/show/chainrings/12-012 What you have is the front side of half-step gearing.
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Old 01-19-10, 12:16 AM   #8
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aight.. we're going for it. I got a Vuelta 36T 110bcd no ramps or crap ring and i'm smart enough to get the Park chainring tool so i'm not stuck going why the hell won't these bolts come out! i'll try to remember to post up on how it goes
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