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 |
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. |
Originally Posted by Surly2698
(Post 21262085)
SRAM Omniums are a lot stiffer than the road cranks you are using.
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). |
Originally Posted by Surly2698
(Post 21262085)
They are 144 bcd and 1/8 so you will need to change the crank set , the bottom bracket, chain, and the rear cog.
|
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 |
It's comforting to see that people on this forum are still 100% insane.
https://cimg8.ibsrv.net/gimg/bikefor...58c9b6a612.gif |
Originally Posted by ThermionicScott
(Post 21267172)
Please show your work on why the cog would need to be changed. :)
Dave |
Originally Posted by bonsai171
(Post 21279042)
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 |
Originally Posted by Scrodzilla
(Post 21279036)
It's comforting to see that people on this forum are still 100% insane.
https://cimg8.ibsrv.net/gimg/bikefor...58c9b6a612.gif |
Originally Posted by ThermionicScott
(Post 21279658)
That's legit. I was curious if our guy knew that you can run a 1/8" chain on a 3/32" cog. ;)
Dave |
Originally Posted by mihlbach
(Post 21267164)
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). The 1/8 chainring could be quieter too since I'm running a 3/32 chainring and 1/8 cog. |
Originally Posted by bonsai171
(Post 21281565)
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 |
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. |
Originally Posted by ThermionicScott
(Post 21281957)
It may remain academic for me. I've never snapped a chain of any width. :o
|
What's a good alternative to the SRAM Omniums in terms of stiffness - since they've been discontinued?
I have a slight bias towards two-piece, external bottom bracket cranksets but really stiff square-taper cranksets are welcome too. Personally, I only know of the Alpina Track crankset which reminds me of the omniums but have never ridden them so can't say how stiff they are https://cdn.shopify.com/s/files/1/12...g?v=1583237720 |
Originally Posted by Zdawg
(Post 22456032)
What's a good alternative to the SRAM Omniums in terms of stiffness - since they've been discontinued?
I've also had good luck with All City track cranks. They're about $100, 144 BCD and available at lots of LBS. Decently stiff and durable. Cheers |
Originally Posted by geomiko
(Post 22456204)
SRAM replaced the Omniums with the S300 Courier Crankset, and I've heard good reviews. The main difference is that the S300 uses a 130 BCD chainring, rather than the 144 BCD that Omniums (and most track cranksets) use. Seems worth the savings, some people are selling Omniums on eBay for $400 since they don't make them any more. Supply and demand is weird sometimes.
I've also had good luck with All City track cranks. They're about $100, 144 BCD and available at lots of LBS. Decently stiff and durable. Cheers This is an older thread but to prevent misinformation, they didn't replace with the S300 they had both in the line up and just dropped the Omnomnomns. If I were looking for an external B.B. Crank it would be Sugino DD75 all the way. If I was more budgety I would go Andel Deluxe or the newer Suzue Pro Max cranks. I would not go SRAM for cranks the GXP is not for me. Give me a spindle that is the same on both sides and can be spaced as needed or I would rather just go square taper which is easy to find. 130 or 144 BCD doesn't matter so much though most track stuff is 144 so you have higher quality options for the average person 130 will do the trick. |
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