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Alloy rear sprocket, yes of noooo?

Old 05-04-2018, 04:10 AM
gorn's Avatar
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Join Date: Jan 2017
Posts: 30
Question Alloy rear sprocket, yes of noooo?

Hi Guys
I've got a CBR600f3 97.
It's been a year long build so far, but I'm nearing the end.
I'm curious about using alloy rear sprockets these days.
I know they will wear out faster than steel for sure.
BUT, what I don't know is, can I just put another one on when it wears out, but with the same chain?
I'm thinking the EK 520 GP chain will be far tougher than an alloy sprocket, so should fair well?
No it's not bling, yes it's for reducing gyroscopic weight.
I already have Ti bolts on the front and rear disc, and alloy (with steel insert) sprocket nuts from www.probolt.com
I will be getting a drilled front sprocket, the EK GP 520 chain (conversion I know), and either alloy or a Supersprox steel and alloy sprocket.

I know already what the general thoughts will be, but I'm wanting to know how many of you have done this, and did it turn to ****....or gold lol.

Before anyone says anything about wasting time on weight loss for an old bike.....
So far I have dropped 9kg (19.8Lb) off the bike, so yes, it will be enough to notice

Old 06-04-2018, 04:42 PM
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Join Date: Jul 2008
Location: Mesa AZ
Posts: 2,012

Yes I ran a few aluminum sprockets per the 20k or so I get from a chain. Got old, fast.
Old 06-04-2018, 09:51 PM
gorn's Avatar
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so it didn't affect your chain life at all then?
If not, that's good news to me
Old 06-10-2018, 11:22 PM
Join Date: May 2018
Location: KC Missouri
Posts: 36

My last aluminum sprocket Looked great 30k+ later when I sold my f4i! I ran a vortex 60t

This is a pic of it right when it was around 20k miles. I even ran the cheapest chain I could find, "KMC" brand from ebay for $68 shipped.

All about keeping your chain clean, lubed, and properly adjusted!

Old 12-22-2018, 06:56 PM
Join Date: Nov 2007
Posts: 60

They wear out faster and they're more expensive, but on the plus side they look nice and they help in the all-important unsprung weight category. Not really a right-or-wrong here, you'll just be buying them more often if you ride a lot.
Old 12-22-2018, 09:12 PM
gorn's Avatar
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Posts: 30

thanks for the replies guys
Old 12-27-2018, 06:10 PM
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Location: Calgary, Canada
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Steel's good enough for us common folks
Old 01-16-2019, 07:26 PM
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Join Date: Jan 2019
Posts: 8
Default It depends

Well, it only saves 1 pound, and has a 5 inch radius, so has almost no gyroscopic effect. An H rated rear (130 mph all day long) will save 3 pounds and it's mostly at a radius of 10 to 12 inches, so it saves 12 to 17.3 times the gyroscopic effect. And you can feel it!

Also, when I weigh the 428 chain and 520 chain, they are the same. Not sure if the 520 weighs less than the 530. (I like the LiFePo batteries, they save 5 pounds. Shorai brand.)

I have run a 428 on my yzf600/fzr400 hybrid for 50,000 miles (plus 3000 when it was a 400), and use wd40 to keep it clean (every 200 miles). It's only halfway through the adjustment range, but half the teeth have broken off the rear sprocket. My yzf has pods and jet kit, and makes 90 hp (maybe 95) at the rear, compared to the stock 85 hp. Maybe I'll get a new AL rear and see if the chain can last another 50k. (Thanks for the idea.)

Once I bought a new steel front sprocket for my cbr after riding across country. The chain had maybe 3000 miles on it, and the new sprocket made it sound like a really loud reverse gear for a few hundred miles. Both ended up lasting just as long as any other chain of mine before I started using wd-40 (maybe 25,000 miles at the most).

That setup was using an aluminum rear that I put on when the chain had a few hundred miles on it from the previous owner (it came off the yzf). It made very little extra noise from then sprocket, and that noise was gone after a hundred miles or so.

I have always used aluminum rear sprockets, but I never will again since I started using wd-40 to keep my chain clean and make it last so long. BTW, I got the idea from a friend who did that with his Honda RS125 at the track (and made his tiny chain last twice as long) and another friend who always had the biggest Kawisaki (Z1, 900 Ninjas, 1200, 1400) and made his 530 chains last eons as well.


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