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Discussion Starter #1
Hi,

I am thinking of putting on a 39t rear sprocket and was wondering which brands are good? Is this something I should look for on ebay or buy new? Just going up 2 teeth I can keep my chain right?
 
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you should be able to keep your chain but if there's any significant wear on it, you may as well replace them at the same time.
i went with sprocketspecialists aluminum unit and was pleased but i imagine pretty much any make will be fine if it's built to fit your rear wheel.
 

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So the aluminum one on Motowheels.com is ok? Is it worth the extra $25 for the "ulta-light" holes or the $10 for anodised??
 
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getting it hard-andodized is definately worth $10. it'll help it last longer.
although i _had_ to have it done for the "poseur" factor, $25's a lot of cake to cross drill that sucker. it's already aluminum anyways and any weight saved is increadibly marginal.
 
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i just picked up one of those supersprox STEALTH sprockets sold through sprocket specialist to satisfy my inner squid. they're pretty cool even if they cost about 50% more than a standard steel rear sprocket.

the sprocket/outer ring is steel so you get long life and good wear supposedly... the carrier/inner ring is gold anodized aluminum so it's lighter than steel... and the two are rivited together with titanium rivits. i got it mainly for sh_i_ts and giggles but it looks pretty cool up next to the DID ERV2 chain. if it don't work out i still have my old stock steel stashed away somewhere.

http://www.supersprox.com/stealth/

fwiw aluminum sprockets for a street bike is just silly... even the hard anodized crap wears off because the base metal is just soft. for the money steel sprockets are a better investment, your chain will last longer and so will the sprocket. as the aluminum wears it changes the pitch and increases chain stretch... the chain links will oval at the pins. to me the few ounces saved aren't worth it. my last steel sprocket had over 12k on it, the one before that had nearly 14k, the chain had just over 26k on it even with me recently neglecting it so i could get a ERV2.

chris kelley is a good source for sprockets and chains (when he's not closed up shop for racing and silly things like laguna) but sprocket specialist are also good to do business with even if kelley's prices are better (while supporting a fellow enthusiast).
 

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I'm using one of those Stealth sprockets on my Supermoto project. I also noticed that the KTM factory bikes were running them at Laguna-Seca.

They need to come up with a 41t version (oh yeah, for a Marchesini wheel) before I switch my Monster over.

--Fillmore
 
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i definitely think it looks good on my 900ss. ;D supposedly there's more meat in the teeth and supersprox claims that it'll last longer... we'll see. the difference in weight isn't all that significant though... just a bit under that of standard steel sprocket, talking ounces.

i believe the real performance gain is in the chain but the sprocket definitely satisfies my inner squid. i'm hoping the gold plates will help make it easier to keep the chain clean. they seemed to help on the ZVM so i'm hoping that'll be true with the ERV2.

if i like it well enough on the 900 i'll probably at least upgrade the chain on the S4, probably convert it over from the 525 to the 520 while i'm at it and see how that holds up.
 

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i can't really see how their steel outer ring would last any longer than afam's all steel sprocket. of course SS are hyping the aluminum, but with total weight difference typically around a pound, i doubt the average person would care.

now, the bling factor?! wow, them's are pretty hot!

problem with S4 is that they use a 525 pitch. the only sizes afam makes in steel are 38,42, and 43. otherwise, the sprocket is identical to the 520 pitch ones used on 851, 888, Monster, and SS. 520 pitch is available in steel from 36-42 or 43. i try to keep one of each in stock. oh, Afam and i are out of the 525 pitch 42 and 43 in steel. hope to get more after the holiday month.

i'm reasonably content with my current product offerings... not real sure if i want to add another product line to inventory right now. hmmm, looks like they're only offering 38~40 in the 520 pitch. among the more popular sprockets are 41 and up...

:)
 
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i can't really see how their steel outer ring would last any longer than afam's all steel sprocket.

problem with S4 is that they use a 525 pitch. the only sizes afam makes in steel are 38,42, and 43. otherwise, the sprocket is identical to the 520 pitch ones used on 851, 888, Monster, and SS. 520 pitch is available in steel from 36-42 or 43. i try to keep one of each in stock. oh, Afam and i are out of the 525 pitch 42 and 43 in steel. hope to get more after the holiday month.

hmmm, looks like they're only offering 38~40 in the 520 pitch. among the more popular sprockets are 41 and up...
i think the supersprox guys were claiming that their tooth cut allow for more material... how much it helps is debateable. they only claim their sprockets last longer than aluminum... like all the other steel sprockets. ;D

i know they offer up to 42t for 520... they shipped me a 42 instead of the 39 i'd ordered...

i might try converting the 525 over to a 520 on the s4, if i'm happy with it that'll make sprocket/chain ordering a cinch. if it don't make me happy i'll just through it on the 900.
 
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