Old 05-11-20, 12:23 AM
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vane171
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It this chainring considered well worn out?

On this secondhand bike I bought recently is large 53T ring that has what looks like some serious scuffs, even gauges. Maybe I should consider replacing it? The 39T ring looks well preserved.
I can buy locally just the big chainring for $85 CAD but I found on eBay cranks with lightly used chainrings of the same make, only difference is the arms are 170 mm

I have always been riding 172.5 mm cranks and I wonder if I should go for 170 mm on this bike. I am not a big spinner but I find when I try for high rpms near 90 p/m, I can lose rhythm but that could be just what is called spinning out?

For only some 50 $ extra I could have a used but still decent big ring plus shorter cranks. I am 5.8+ (5.8 + 1/2") and the bike is M size (54cm).




This and next picture are the same view, one with flash and the other without







BTW what are those rivets on the big ring for? They are spaced irregularly, maybe they help the chain to move to the small ring or back to the big one?

Last edited by vane171; 05-11-20 at 12:34 AM. Reason: Add two more images
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