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Old 12-14-07, 12:02 PM   #1
Pepper Grinder
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How much life left in this crankset?

I was given a 600 53/39 crankset and wouldn't mind replacing my current 52/42 Biopace (hahaha) crankset, but the teeth look kinda worn. I know some chainrings have some funny lookin' teeth for smoother shifting, so I can't really tell how worn out these rings are because I'm inexperienced.

Thoughts?

Links to hi-res pics so as to avoid breaking the tables:

http://img248.imageshack.us/img248/415/frontci3.jpg

http://img510.imageshack.us/img510/3828/backqz3.jpg

Last edited by Pepper Grinder; 12-16-07 at 05:38 AM. Reason: table breakage
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Old 12-14-07, 03:14 PM   #2
WNG
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The large chainring is worn out.
Shimano had featured W-Cut chainrings in previous generations of 600 and Dura Ace. Not this generation.
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Old 12-14-07, 03:23 PM   #3
Sheldon Brown
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Quote:
Originally Posted by WNG View Post
The large chainring is worn out.
Shimano had featured W-Cut chainrings in previous generations of 600 and Dura Ace. Not this generation.
Right. My advice is to use the Biopace 52 if it's in good shape, but use the round 39 if you find the Biopace 42 too high.

Any of these chainrings will fit on either of these cranks. There's no such thing as a "Biopace crank." Both of these cranks and all 4 of the chainrings are the standard 130 mm bolt circle.

I see that the 600 crank is an oddball length, 172.5. This should enter into which set of arms you wind up using.

See also: http://sheldonbrown.com/cranks

and: http://sheldonbrown.com/biopace

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Old 12-15-07, 10:47 PM   #4
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The large chainring is worn, but it's not too bad IMHO. I would definitely still use it. In fact, on one of my bikes I have a chainring that is in about the same shape. It is a steel chainring, so it's not going to wear down too much in the foreseable future, either (I'm talking about mine).
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