what chain rings do I need

Questions about purchasing bicycles and parts

what chain rings do I need

Postby vet racer » Mon Dec 24, 2012 10:17 am

I think I need new chain rings. My bike is a 2006 Giant TCR Avanced 0. I know they are dura ace but can anyone tell me if they the 7900 series please.
Apart from the number of teeth is there anything else I need to be aware of when ordering these parts online? Are there any other specifications I need to state when ordering?
I reckon I have got about 35000km out of the originals, don't ride much in wet weather and keep the drivetrain fairly clean. Does that seem like a reasonable life span?
Thanks in advance.
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by BNA » Mon Dec 24, 2012 12:53 pm

BNA
 

Re: what chain rings do I need

Postby warthog1 » Mon Dec 24, 2012 12:53 pm

In 2006 they would have been 7800 series

Image

There are 2 different bolt center diameters. The 7800 series were 130mm bcd and usually 53-39t.
If you have a compact, 110mm bcd and 7850 series, they will usuall be 34-50t.
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Re: what chain rings do I need

Postby scirocco » Mon Dec 24, 2012 2:38 pm

You need rings to fit the cranks. The cranks have the number like 7800 or 7850 stamped on them on the back near the pedal. That tells you what model.

Then you need the right number of teeth on the rings. Count the big and small rings, then order that same number and you can't go wrong.

If you want to save money, Ultegra 6600 series rings with the same number of teeth will work fine and may be cheaper and easier to find.
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