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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 04-14-12, 10:13 PM   #1
pvn.23
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Cracked EAI cog, how did it even happen?



Hey everyone, I had just swapped my cog and when I finally checked it for the first time since last April (didn't really re-grease it since I knew it already had a good amount of grease between the treads). And well, when I took a closer look I saw a crack. How exactly does the cog crack? Use over time? Durability issues with EAI cogs?

Luckily I switched it out sooner than later, another crack was starting to develop, but had not gone the whole way yet. There were plenty of chips as you can see in the picture...

Anybody had this issue before?
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Old 04-14-12, 11:50 PM   #2
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Never even heard of that happening.

Not to sound typical, but you should've went with Dura Ace lol
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Old 04-15-12, 12:04 AM   #3
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Never even heard of that happening.

Not to sound typical, but you should've went with Dura Ace lol
Yeah, I've heard good stories about DuraAce, but EAI is still pretty good. Although it's their cheapest line up of cogs (Deluxe, Superstar, Gold Medal)... I bought this 14t from a bike swap for $10 and it was brand new when I got it too.
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Old 04-15-12, 06:16 AM   #4
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I've never seen any cog crack like that. You should contact Dave Lundegard at EAI.
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Old 04-15-12, 08:20 AM   #5
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Have you only had the cog since last april? Or was that the last time you greased?

I just got an EAI cog (17t) and this is kind of disconcerting.
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Old 04-15-12, 09:13 AM   #6
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I've never seen any cog crack like that. You should contact Dave Lundegard at EAI.
And that's exactly what I did! Dave replied back this morning and told me to ship it in to them and they will replace it at no charge.

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Have you only had the cog since last april? Or was that the last time you greased?

I just got an EAI cog (17t) and this is kind of disconcerting.
That was when I got the cog and the last time I greased it as well. I didn't really need to grease it anymore (or so I thought) but even though I only greased it once since the installation, when I took it apart yesterday, there were still a whole lot of grease left both on the threads and the cog and lockring.

I just picked up a 17t EAI Deluxe as well and installed that yesterday. Double checked everything but now I'll have to do more monthly maintenance.
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Old 04-15-12, 09:22 AM   #7
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And that's exactly what I did! Dave replied back this morning and told me to ship it in to them and they will replace it at no charge.
Right on. Euro Asia is by far one of the most amazing companies to deal with.
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Old 04-15-12, 10:04 AM   #8
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Manufacturing defect; nothing you can really do when riding will break a cog.

Unfortunately, brittle failures like this can occur with hardened steel.
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Old 04-15-12, 12:49 PM   #9
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whoa. definitely one for the QC folks.

i used to deal with knife manufacturers. one bad batch of steel can cause all sorts of mayhem.

glad they got on it for you.
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