i ordered a 17t from ben's yesterday (but it's 3/32)

I just bought a 19t, 1/8" eai cog (not deluxe) at the clean machine in carrboro, n.c. this past weekend - they had several other sizes in stock also. Kind of pricey @ $39 + tax.

Supply and command; denial and error.

Dobber thats what I was told by my lbs a week ago apparently they are suppling a lot of the cogs for the Olympics

i suspect eai cogs are discontinued, there was a time when the 17T were in abundance..

I was bummed out when I went to pick up a Phil cog at my LBS recently only to find they'd just sold the one I needed and had no more in stock. This was the last thing I needed in completing this bike and I was really anxious to start riding it, so I went with the only other option they had in that size -- a Surly. The LBS guy, who is very trustworthy, told me it was good, and he was right. The bike that I put the Surly is whisper quiet. I have a Phil cog on another bike, and an EAI on another -- they are both great, but the Surly is hands-down the quietest of the three.

So don't be a cog snob!

it sucks that such a good product like eai cogs/lockrings are all but extinct.

I'd bet you a zillion dollars (i can do that because i'm a zillionaire) that the "whisper quiet" ride has everything to do with chainline and 0 to do with the cog.

swap the cogs to prove it.
in fact, i'd bet that the phil is quieter on whatever you have the surly on; depending on the eai model, it might be even quieter.

i rode a 16t da on my bob jackson for like a month. i thought it was the quietest thing ever. then i bought a 16t superstar. now, i literally only hear the carbon of my fork resonating when i'm moving fast at night.

i'll send you my paypal info for that zillion later.

wait i dont get it. it doesnt have to do with the cog you are saying, but the chainline.

but you state the eai superstar is quiter than the da you had? doesnt that have to do with the cog?

yeah, in his instance. should've been clearer... here, i'll illustrate:

-bike 1 has an eai
-bike 2 has a phil
-bike 3 has a surly
-bike 3 is the quietest

in his situation, bike 3 isn't quiet because the cog is superior, but because the chainline on bike 3 is closer to 0 offset than on bike 1 or bike 2.

to illustrate this (kinda) further:
-bike 1a has a da
-bike 1b has an eai ss
-bikes 1a and 1b have identical chainlines
-bike 1b has a quieter drivetrain than bike 1a

this is because the cog is superior. all things equal, cog matters more. in his case, all things are not equal.

i may or may not have gone to far with this post.

I realize there are other factors like the chain and the chainline (though they are all track bikes and the chainlines are perfect). I don't want go switching the cogs on all my bikes to prove something. My point was just that I put a Surly cog on a bike and it is extremely quiet and smooth. If there was something inferior about a Surly cog -- which is what a lot of people seem to be saying -- wouldn't it be making noise even with a perfect chainline? How else do you judge a cog?

i bet it's quiet 'cause all the teeth broke off.

Ohhh i gotcha. it sometimes doesn't matter, but in some cases it definitely CAN matter is what you're saying. cool.


so, all things said, best bang for buck 17 tooth 1/8" cog ?

How do you know about the chainlines on my bikes?!

everybody is lamenting the end of EAI cogs on here... you can buy them at harriscylery.com! end of thread.

i had seen them