don't be tempted by the pretty gold colour....sprocket

[rictus01]

keep it handy, once senility finally kicks in with full force, I just may have to have a browse through...

[Geodude]

Haha will do

[muzikill]

How many miles did you do on it?. Could it have been a fake?

[andrewsmith]

Wow!

I won't be fitting renthal Anodized anytime soon.
You could have always found http://forums.sv650.org/showpost.php...70&postcount=1

[flymo]

I've used these before and never seen wear as bad as the one you have. Perhaps this wasn't maintained properly, perhaps it was a faulty anodised batch, who knows.

If a sprocket could get as bad as that without the owner noticing then my guess is that the chain was equally as neglected.

I'm with Flymo on this. Our race bikes always have Renthal anodised alloy sprockets and get abused with little or no maintenance in real terms. In four years of running a ZX10R in Bemsee Powerbikes and three years of a 675 Daytona in Superstock 600s we never had one rear sprocket wear anything like as bad as yours. The bikes aren't just used once a month through summer, they get used all year round as trackday instruction bikes so spend a huge amount of time being caned on track.

I've just bought 7 lightly used Renthal alloy rear sprockets in different sizes for my CBR600 track/race bike and expect them to last the lifetime of the bike

[Bibio]

looks like the chain has been rubbing on one side only which would explain the excessive wear so possibly the wrong sprocket for the bike.

Wow,,that is bad. Don't recall seeing a sprocket that bad.

I'm with flymo and lozzo, I have them on my race bike which also does a lot if trackdays and still look good as new. I just check adjustment every ride or wheel change, keep it clean and lightly lubed. Think a lot of people have chain too tight which makes chain dig into sprocket when susp compressed hence wrecking hardened surface. Once you are through that it may as well be made of chocolate.

[rictus01]

as I've said the chain and top sprocket weren't in bad nick, if I'd have had the history I may have just replaced the rear, but obviously when you get a secondhand bike you just don't know.

Alloy sprockets were originally developed for competition; where the weight saving can have a significant advantage, but then the bike gets far more attention than your average road bike, so any wear would get changed out sooner rather than later, I see no significant cost saving over steel and now having seen possibily the worst conditioned sprocket in a very long time myself, I'll not ignore experience.