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Old 11-21-2014, 11:59 AM   #1
farmrjohn OP
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New Sprocket: Aluminum vs. Steel?

It looks like I may need a new rear sprocket for my TX750. There are a lot of 34T sprockets available, but I need a 40T one. PBI lists one, but it's aluminum and the stock one (no longer available from Yamaha) on the bike is steel. Is there a significant difference in the wear characteristics between the two materials?
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Old 11-21-2014, 10:15 PM   #2
fxray
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There's one on eBay that says it is NOS but not in original packaging for $36.75 and free shipping. CLICK
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Old 11-22-2014, 06:42 AM   #3
hugemoth
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There is a huge difference in wear. Aluminum will wear out much faster.
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Old 11-22-2014, 07:44 AM   #4
PSchrauber
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In personal experience no big difference if the chain is well lubed. The most imprtant factor is the chain any new sprocket combined with an old chain will wear out quick. To the aluminum sprockets there are some cheap ones available, it should be clear that most of them are made out of standard aluminum and just hardened at the surface by using Eloxal or likewise coating. Good ones are f.e. available from Renthal.
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Old 11-22-2014, 07:45 AM   #5
anotherguy
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Steel unless you are saving grams.
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Old 11-22-2014, 08:29 AM   #6
JonnyCash
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I once accidentally bought an aluminum rear sprocket for my RD350, and it didn't have any kind of coating to harden it. I was sure that it was going to wear out in no time, but it did just fine. I sold the bike about 3000miles after installing it, and it wasn't showing any wear to worry about.
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Old 11-22-2014, 09:07 AM   #7
farmrjohn OP
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Quote:
Originally Posted by fxray View Post
There's one on eBay that says it is NOS but not in original packaging for $36.75 and free shipping. CLICK
Thanks. I didn't see that one but found a JT 40T sprocket from an eBay store in Japan that I've already purchased. Rats.
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