Hibonite

The outer 46t chainring on my Sugino crankset (110 bcd) appears very worn after 9600 miles - chain replaced prior to excessive measured wear. I also have a Campy Athena crankset on another bike with about the same mileage and riding conditions and it has negligible wear. What I see on the Sugino chainring appears to be a result of deformation wear it pulls the chain, rather than true wear. In other words I see metal piled up where the chain contacts the teeth. The Sugino chainring is 2014 aluminum, whereas the Campy is likely 7075 I believe, as are most other chainrings that I have seen. However, when you look up the hardness values for these alloys they seem to be about the same. Does anyone know more about Al than I have been able to find on line and any suggestions as to a longer lasting chainring replacement?

Actually, if all of the teeth show the same deformation, it should not have any effect on chain wear as long as shifting doesn't suffer. What have other found with Sugino rings?

fietsbob

N.1) Do You understand the numbers system for aluminum alloys?


Premium priced chainring manufacturers use the 7075, it must be machined.

2014 allows a punched out tooth ring in one Go. so production costs are lower ..


Some one with a degree in materials science at a Uni with an Engineering department could help for advanced answers ..

shelbyfv

I think very few of us here imagine we could look at a chainring and assess the wear on it.

sreten

Hi,

Excessively worn chains damage chainrings not the mileage.

Damage is relatively easy, if you can see it, it is toast.

If it is a reversible ring, reverse it.

rgds, sreten.