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SRAM Omniums

Old 12-19-19, 04:04 PM
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bonsai171
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SRAM Omniums

Hello,

I am currently running Sugino VP130 road cranks (circa early 80's) on my Kilo tt. Been thinking about swapping it out for some SRAM Omniums. Would it be worth the upgrade?

Thanks,

Dave
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Old 12-29-19, 03:16 PM
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SRAM Omniums are a lot stiffer than the road cranks you are using.
They are 144 bcd and 1/8 so you will need to change the crank set , the bottom bracket, chain, and the rear cog.
Thats a lot of money in my book.
Keep an eye on Ebay or Craigs list for a used set.
Good luck.
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Old 01-02-20, 12:25 PM
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Originally Posted by Surly2698 View Post
SRAM Omniums are a lot stiffer than the road cranks you are using.
Do you know that for sure, or is that an inference you are making because the Omnium is billed as a track component? It might be stiffer, but what is "a lot" stiffer?

Personally, I wouldn't upgrade cranks for a moderate (and possibly imperceptible) change in stiffness. Possibly more tangible reasons to upgrade are: (1) the 144BCD of track cranks is compatible with highly refined 1/8" track chainrings which maintain a more even chain tension than most 130BCD road chainrings, (2) and possibly narrower Q which may feel more ergonomic and more comfortable (for certain people).
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Old 01-02-20, 12:30 PM
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Originally Posted by Surly2698 View Post
They are 144 bcd and 1/8 so you will need to change the crank set , the bottom bracket, chain, and the rear cog.
Please show your work on why the cog would need to be changed.
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Old 01-10-20, 09:15 AM
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A lot people on my place use that crankset, they said its stiff but liked it.

The only trouble with it r the hollowtech bb, they said the threaded thing will worn out in short time (i dont know the exact word in english to explain, but i hope u get what i mean!)
So some people keep the original one and buy other ht bottom bracket
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Old 01-10-20, 05:56 PM
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It's comforting to see that people on this forum are still 100% insane.


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Old 01-10-20, 06:07 PM
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Originally Posted by ThermionicScott View Post
Please show your work on why the cog would need to be changed.
I already run a 1/8 cog and 1/8 chain. Only thing I could see changing would be if a longer chain is needed after swapping out the bb and crankset.

Dave
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Old 01-11-20, 09:55 AM
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Originally Posted by bonsai171 View Post
I already run a 1/8 cog and 1/8 chain. Only thing I could see changing would be if a longer chain is needed after swapping out the bb and crankset.

Dave
That's legit. I was curious if our guy knew that you can run a 1/8" chain on a 3/32" cog.
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Old 01-12-20, 06:40 PM
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Originally Posted by Scrodzilla View Post
It's comforting to see that people on this forum are still 100% insane.

Is that Elvis I see in the woods? LOL
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Old 01-12-20, 06:52 PM
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Originally Posted by ThermionicScott View Post
That's legit. I was curious if our guy knew that you can run a 1/8" chain on a 3/32" cog.
Kinda makes me wonder. A 1/8 cog and 3/32 cog are only 1/32nd of an inch difference in width if you do the math. Is a 1/8 chain really that much stronger??

Dave
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Old 01-12-20, 06:56 PM
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Originally Posted by mihlbach View Post
Do you know that for sure, or is that an inference you are making because the Omnium is billed as a track component? It might be stiffer, but what is "a lot" stiffer?

Personally, I wouldn't upgrade cranks for a moderate (and possibly imperceptible) change in stiffness. Possibly more tangible reasons to upgrade are: (1) the 144BCD of track cranks is compatible with highly refined 1/8" track chainrings which maintain a more even chain tension than most 130BCD road chainrings, (2) and possibly narrower Q which may feel more ergonomic and more comfortable (for certain people).
A well machined 1/8 chainring should be more round. Sounds like that's what you're alluding to. Never really had an perceptible issue with chain tension, but I might just go to the omniumns bc I'm building up a single speed for my dad and need a crankset for it.

The 1/8 chainring could be quieter too since I'm running a 3/32 chainring and 1/8 cog.
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Old 01-13-20, 12:55 AM
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Originally Posted by bonsai171 View Post
Kinda makes me wonder. A 1/8 cog and 3/32 cog are only 1/32nd of an inch difference in width if you do the math. Is a 1/8 chain really that much stronger??

Dave
It may remain academic for me. I've never snapped a chain of any width.
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Old 01-13-20, 01:20 PM
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Stronger riders use narrower chains all the time. Aside from the entire road, MTB, and CX worlds, top level track racers have won Olympic races on 11 speed width chains and sprockets: https://bikerumor.com/2017/03/09/bfs...xed-gear-bike/
Strength doesn't seem to be an issue. As for whether these parts have the durability and longevity of 1/8 track equipment, my gut says probably not.
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Old 01-15-20, 11:33 AM
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Originally Posted by ThermionicScott View Post
It may remain academic for me. I've never snapped a chain of any width.
Hope you get lucky! I snapped my first one last year after over 20 years of riding. Must be my massive quads :-p lol
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Old 01-26-20, 05:14 AM
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Originally Posted by Scrodzilla View Post
It's comforting to see that people on this forum are still 100% insane.
I double-dog dare you to spend time reading the C&V subforum without running outside screaming.
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