frEEk
Administrator
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posted July 31, 2005 11:19 AM
how do aftermarket sprockets stack up?
i know they don't last as long (esp the aluminium ones) but the stock sprockets seem to outlast chains by a big margin anyway, so i assume an AL sprocket ought to last just fine?
also, the aftermarket front sprockets never seem to have the rubber bushings. what is the effect of this? more noise?
thx!
   
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zx12adam
Member
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posted July 31, 2005 03:16 PM
Rubber bushings are for a quieter ride. A friend of mine put an aluminum sprocket(Vortex) on his 95 ZX6, it lasted 4500 miles. Of street only riding, no trackdays.
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trenace
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posted July 31, 2005 04:14 PM
 Edited By: trenace on 31 Jul 2005 17:17
What appears to me the best is the Supersprox "Stealth" sprocket, where the carrier is aluminum but the teeth are steel, combining the best of both.
Only problem is the American distributor, Victor Krause (a.ka. "Mr Know It All" from Dirt Bike) wants a rather pretty penny, over $120 I think.
I only paid something like $65 (or was it 65 Euros, not sure) getting it direct from Europe but I'm not sure that one generally can do it, my case may have been an exception since it was for wheels that Krause did not have sprockets stocked for.
Very sweet sprocket though.
Interesting claim they make, that turned me off of aluminum: they say that within very few miles, the deformation suffered by aluminum teeth, slight as it may appear to the eye, is sufficient to cost several hp. Obviously that's something that's subject to verification or falsification on the dyno, but lacking that I'll assume they're right as it doesn't seem implausible.
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frEEk
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posted July 31, 2005 08:34 PM
seems to me the weight savings of that design would be minimal.
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trenace
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posted July 31, 2005 09:15 PM
Edited By: trenace on 31 Jul 2005 23:39
I don't know the weight of the stock sprocket.
My Stealth sprocket is 1 lb 8 oz. Actually holding it in the hand there's a lot of steel that's replaced by aluminum so there has to be a good amount of weight savings.
I have a Vortex aluminum sprocket and it is 1 lb 4 oz.
I'll take the extra 4 ounces if the teeth staying more perfectly shaped once in use due to being much stronger and harder gives me an extra couple of hp.
If that is not true then I should have used aluminum.
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zx12adam
Member
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posted July 31, 2005 11:50 PM
I got one of those Stealth sprockets when it 1st came out, $65 also, hadn't needed it until recently after the stock chain sprocket set ended up lasting 20,000 miles! At 2+ it's still lighter than the stock one, not sure by how much though. It uses Titanium rivots to hold the aluminum/steel together and very high quality.
My friend's Vortex that lasted 4500 miles on his 6? Forgot to mention at 4500 miles it was missing 6 teeth that sheered off due to wear, all the other teeth were on their last legs.
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slug
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posted August 01, 2005 03:33 AM
most i ever got out of an aluminum sprocket was 12k, but it lost 1/3 of its teeth its last ride.
it *needed* changed at 10k
sprocket specialists titan tough aluminum sprockets seem to do well.
BUT i am running half the HP you folks are running, so YMMV (literally)
i have also heard vortex sprockets are about hte same quality as RK chains, both of which seem to be made by Hoover.
  
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zx12adam
Member
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posted August 01, 2005 05:32 AM
Why don't they just make a titanium sprocket? Too expensive? Stronger than a steel and lighter than an aluminum.
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frEEk
Administrator
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posted August 01, 2005 08:55 AM
sounds like aluminium sprockets are a waste of money. think i'll stick to steel. thx for the feedback!
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trenace
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posted August 01, 2005 02:12 PM
Edited By: trenace on 1 Aug 2005 15:14
Titanium is not stronger than steel per unit area. It is only stronger if you make it quite a bit thicker, which you can do for the same weight or less because of its being less dense.
Since the teeth are a fixed width, titanium would be weaker.
It can also be prone to fatigue in many instances where steel is not in those instances.
I don't know about the hardness.
Also, titanium for same volume actually is heavier than aluminum.
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NOX
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posted August 04, 2005 06:31 PM
Aluminum gains the most in less rotating mass. If they were so bad, so many drag racers would not be using them.
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scooter trash
Expert Class
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posted August 04, 2005 08:15 PM
Titanium is not well suited for impact applications.
A sprocket is a really good example of where you would not want Ti.
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psycho1122
Pro
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posted August 05, 2005 06:40 AM
One word....AFAM
I have used AFAM Aluminum rear sprockets on my 1270 12 exclusively.
No noticable wear by the time the chain is done. 26,000 miles and I'm just into my third chain. I go @ 10-12k miles on a chain.
Looks like Renthal makes some nice Aluminum's also....
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slug
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Out in search of my mind...
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posted August 05, 2005 08:59 AM
10-12k miles on a chain?!?!?!
i got 25k out of my last one...
hemm afam aluminum sprockets eh. i'll see what i can dig up
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beansbaxter
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posted August 06, 2005 06:22 AM
I got 30k miles out of my stock chain and stock sprockets. I only changed them cause I thought I should - the dealer told me everything was still well within spec.
I prefer all stock oem stuff in regards to replacing these parts.
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psycho1122
Pro
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posted August 06, 2005 03:46 PM
I lube regularly (every 200 mi or so) and the chain will still get some "Kinks". At that point I will replace. It does cost you some h.p. to leave it go too long.
1270 w/ 112 ft. lbs. does not help the cause!
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