Potential issue with fixed gear rear sprocket
10-19-19, 03:19 AM
#1
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Potential issue with fixed gear rear sprocket
Hey guys, I bought a cheapie cog online which arrived yesterday and before istalling it I've noticed that the "ramp" (not sure how to best describe it) at the end of each tooth is not uniform, and in the cases of some of the teeth, there is no ramp at all.
Here is what I mean -
Photo 1: you can see the "ramp" at the end of some of the teeth
Photo 2: Some of the teeth don't have it
Will this affect how the chain engages the teeth?
Here is what I mean -
Photo 1: you can see the "ramp" at the end of some of the teeth
Photo 2: Some of the teeth don't have it
Will this affect how the chain engages the teeth?
10-19-19, 05:55 AM
#2
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Should be ok, maybe noisier than a higher-end cog. The problem I usually see on cheap track cogs is poorly formed threads that can damage the hub.
10-19-19, 10:40 AM
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Should be fixable with a few minutes' file work. Often, you get what you pay for.
10-19-19, 01:31 PM
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Shouldn't affect it at all. On a fixed-gear with good chainline, the chain engages up-and-down with the cogs, so any chamfering of the cog teeth is mostly for looks.
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Last edited by ThermionicScott; 10-19-19 at 01:38 PM.
10-19-19, 08:54 PM
#6
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I just noticed the seller is in my city - I'll shoot em a message and try get an exchange. There's not much I like less than having a loud or slightly clicky fixed chainline... or filing chrome off steel parts.
Anyway, since the topic of spending less and often getting sub-par goods was raised, is Dicta a brand that manufactures poorly-machined parts? I've probably gone through half a dozen fixed cogs by them (as well as a couple of freewheels) and never had issues before now.
edit: just got a reply back from the guy and am exchanging it for a properly machined cog. He was saying that he looked through all the other 17t cogs and there were only a few that were satisfactory while all the rest had the same problem. However, all his other stock (12-16t and 18-19t) didn't have this defect.
Anyway, since the topic of spending less and often getting sub-par goods was raised, is Dicta a brand that manufactures poorly-machined parts? I've probably gone through half a dozen fixed cogs by them (as well as a couple of freewheels) and never had issues before now.
edit: just got a reply back from the guy and am exchanging it for a properly machined cog. He was saying that he looked through all the other 17t cogs and there were only a few that were satisfactory while all the rest had the same problem. However, all his other stock (12-16t and 18-19t) didn't have this defect.
Last edited by Decadence; 10-19-19 at 09:20 PM.
10-19-19, 09:32 PM
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I just noticed the seller is in my city - I'll shoot em a message and try get an exchange. There's not much I like less than having a loud or slightly clicky fixed chainline... or filing chrome off steel parts.
Anyway, since the topic of spending less and often getting sub-par goods was raised, is Dicta a brand that manufactures poorly-machined parts? I've probably gone through half a dozen fixed cogs by them (as well as a couple of freewheels) and never had issues before now.
edit: just got a reply back from the guy and am exchanging it for a properly machined cog. He was saying that he looked through all the other 17t cogs and there were only a few that were satisfactory while all the rest had the same problem. However, all his other stock (12-16t and 18-19t) didn't have this defect.
Anyway, since the topic of spending less and often getting sub-par goods was raised, is Dicta a brand that manufactures poorly-machined parts? I've probably gone through half a dozen fixed cogs by them (as well as a couple of freewheels) and never had issues before now.
edit: just got a reply back from the guy and am exchanging it for a properly machined cog. He was saying that he looked through all the other 17t cogs and there were only a few that were satisfactory while all the rest had the same problem. However, all his other stock (12-16t and 18-19t) didn't have this defect.
I wouldn't say they only produce poorly made parts or that they want to. But they do position their products at the middle and lower end of the business. Hence their popularity. And as you found out they work quite well most all the time. "Good enough" enough of the time.
So I take it that this cog was never actually tried? If so then I'd be hesitant to claim a defect until actual experience suggested so. Andy
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AndrewRStewart
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10-19-19, 11:32 PM
#8
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I wouldn't say they only produce poorly made parts or that they want to. But they do position their products at the middle and lower end of the business. Hence their popularity. And as you found out they work quite well most all the time. "Good enough" enough of the time.
So I take it that this cog was never actually tried? If so then I'd be hesitant to claim a defect until actual experience suggested so. Andy
So I take it that this cog was never actually tried? If so then I'd be hesitant to claim a defect until actual experience suggested so. Andy
Anyway I tried to organise an exchange of the irregularly machined part for one that is normal, but the guy doesn't want it back and said he'd just post the replacement - he didn't sound impressed upon discovering that all of his 17t stock is the same. So I suppose I'll put it on and ride it around the block a few times to see how it fares before using the replacement.
