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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 01-14-11, 04:38 AM   #1
dodgyboy64
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sram omnium

Does anyone know the cheapest place I can buy a sram omnium crankset 165?
so far this is the cheapest at $182.
http://store.icyclesusa.com/sram-omn...ck-p41831.aspx
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Old 01-14-11, 08:04 AM   #2
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$164.95 at Bikeisland

http://bikeisland.com/cgi-bin/BKTK_S...ls&ProdID=1371
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Old 01-14-11, 11:19 AM   #3
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Or look on eBay. I bought a new set for $130.
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Old 01-14-11, 11:22 AM   #4
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Or look on eBay. I bought a new set for $130.
orly? who was it? a store or individual? brand new out of the box? or take off? bottom bracket and chainring included?
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Old 01-14-11, 11:27 AM   #5
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Yea, it was brand new from an individual. Everything was included, and the NDS crank arm was still wrapped in plastic. The only problem was that the bottom bracket was incorrectly marked (DS was marked NDS, and vice versa), but everything still works.
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Old 01-14-11, 11:30 AM   #6
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hmm weird. just curious cuz when i was shopping for mine the lowest i found was 165 shipped. But i would totally take incorrect markings like that for 35 bucks cheaper. i think its pretty easy to tell which side is which without markings ;p
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Old 01-14-11, 11:50 AM   #7
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Bikeisland +1. 164.95 SHIPPED. Thats where I got mine. Package arrived one day EARLY!!=]
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Old 01-16-11, 11:20 AM   #8
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You know, I put an FSA Gossamer Megaexo crank on my SE Lager. You can get those much cheaper and still have your external BB.
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Old 01-16-11, 11:32 AM   #9
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You know, I put an FSA Gossamer Megaexo crank on my SE Lager. You can get those much cheaper and still have your external BB.
This is like telling someone shopping for a Audi that a KIA is a good alternative because they both have four wheels.

FSA Gossamer is 110bcd, limiting your options for quality chainrings and not nearly as stiff as Omniums.
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Old 01-16-11, 11:46 AM   #10
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Bikeisland +1. 164.95 SHIPPED. Thats where I got mine. Package arrived one day EARLY!!=]
Wow And your in SF When ever i getsomething from bd or islands it takes like 3 days
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Old 01-16-11, 08:47 PM   #11
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thanks
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Old 01-16-11, 09:33 PM   #12
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This is like telling someone shopping for a Audi that a KIA is a good alternative because they both have four wheels.

FSA Gossamer is 110bcd, limiting your options for quality chainrings and not nearly as stiff as Omniums.
to be fair they do make a 130-bcd gossamer. and the real let down of fsa cranks is the bb, but i don't get what makes the omnium so good, sram has produced it's share of rubbish cranks.

Plus gossamer cranks can be had as take offs supercheap as often it's cheaper to buy new cranks than new rings.
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Old 01-16-11, 10:59 PM   #13
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to be fair they do make a 130-bcd gossamer. and the real let down of fsa cranks is the bb, but i don't get what makes the omnium so good, sram has produced it's share of rubbish cranks.

Plus gossamer cranks can be had as take offs supercheap as often it's cheaper to buy new cranks than new rings.
On geared bikes the chainrings shift like crap compared to Shimano cranks too...but that's a nonissue here.
You're on crack if you think you can tell the difference between the FSA and the SRAM cranks. Once you ditch old square taper cranks the only difference in stiffness is going to be in your head. The gossamer crank is also lighter than the Omniums with both chainrings attached, which means the Omniums are freaking expensive boat anchors.

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Old 01-16-11, 11:10 PM   #14
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On geared bikes the chainrings shift like crap compared to Shimano cranks too...but that's a nonissue here.
You're on crack if you think you can tell the difference between the FSA and the SRAM cranks. Once you ditch old square taper cranks the only difference in stiffness is going to be in your head. The gossamer crank is about as heavy as the Omniums with both chainrings attached, which means the Omniums are freaking expensive boat anchors.
I'm on crack then. Along with lots of other people:
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Old 01-16-11, 11:16 PM   #15
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Shush you, you know the chances of the OP having a bike that like that is pretty slim.

With carbon road shoes the only difference I can tell between the gossamer crank and the Ultegra crank I replaced it with was the (much) smoother bearings and shifting(which doesn't matter in this case).
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Old 01-16-11, 11:37 PM   #16
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I AM O-FENDED.

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Roadies can run tempo all year as that's what humans were designed for. If you want to be a cheetah, lay around and lick your paws more.
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Old 01-17-11, 12:16 AM   #17
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You're on crack if you think you can tell the difference between the FSA and the SRAM cranks.
Just so I have the facts straight, we're saying that a cheapo 110 bcd crankset is just as stiff and 144 bcd Omniums? Really?

You're probably right, though. There's no way a 200 lb guy who has been riding bikes for 30 years would be able to detect any difference.
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Old 01-17-11, 02:11 AM   #18
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Really, I think you would know the difference. +1 for omnom
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Old 01-17-11, 04:24 AM   #19
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I enjoy omniums and think they are great cranks but any steel or aluminum frame is gonna flex before any external bb cranks. I dont know why people here flip sh1t over "flexy" cranks. I can watch my alu s1 bb area move back and forth when i put out anything over 400 watts. Never felt flex in my 6600 cranks arms and certainly not with my 6700's cranks. All that being said i would still go for omniums any day, i hate fsa cranks
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Old 01-17-11, 10:43 AM   #20
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Just so I have the facts straight, we're saying that a cheapo 110 bcd crankset is just as stiff and 144 bcd Omniums? Really?

You're probably right, though. There's no way a 200 lb guy who has been riding bikes for 30 years would be able to detect any difference.
There's only one way to find out!




Without claiming superiority for either, i'm with ghramcracker on this one, i think frame flex is going to play a lager part in perceived flex thank cranks will, I've experienced this myself, and didn't notice any increase in stiffness with omniums over sugin RD's on a steel frame, the whole bike was quite flexy. but my gossamer/scandium rig feels wicked stiff. i was just looking to support a lower cost option as that is 90% as good. i've seen gossamers and sram rival cranks for under 75$, less without rings or with worn rings.

Although i must concede shifting on FSA rings is ****. and the bb is rubbish, but that's true of any external cup bb that isn't made by shimanno.

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Old 01-17-11, 11:11 AM   #21
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I enjoy omniums and think they are great cranks but any steel or aluminum frame is gonna flex before any external bb cranks. I dont know why people here flip sh1t over "flexy" cranks. I can watch my alu s1 bb area move back and forth when i put out anything over 400 watts. Never felt flex in my 6600 cranks arms and certainly not with my 6700's cranks. All that being said i would still go for omniums any day, i hate fsa cranks
This is the key to understanding this whole "stiffness" issue. Cranks contribute very little to the (lateral) flexibility of a bicycle taken as a complete assembly. The frame and wheels have a lot more to do with this. The total flexibility is the sum of the individual flexibilities, and the total stiffness is the inverse of the total flexibility. So, while external bearing BB's with large diameter spindles and cranks arms with large cross-sections and larger bcd's may be individually stiffer than traditional designs with internal BB's and square taper spindles, the overall difference is relatively small. Futheremore, external BB's increase the effective overall lateral flexibility of a bicycle assembly, because they increase the Q-factor which increases the eccenticity of the force application point on the pedal relative to the plane of the bicycle frame. This in turn results in a greater torsional moment, which results in greater out-of-plane deflection of the frame and wheels. So, in the end, I don't see the need to worry about manufacturer's claims regarding relative stiffness of different quality cranksets, and am more concerned with quality factors such as roundness of chainrings and quality of bearings.
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Old 01-17-11, 11:27 AM   #22
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Just so I have the facts straight, we're saying that a cheapo 110 bcd crankset is just as stiff and 144 bcd Omniums? Really?

You're probably right, though. There's no way a 200 lb guy who has been riding bikes for 30 years would be able to detect any difference.
Are you able to read? They come in both 130 and 110bcd. Mine were 130, which is why I ditched em.
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Old 01-17-11, 11:32 AM   #23
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This is the key to understanding this whole "stiffness" issue. Cranks contribute very little to the (lateral) flexibility of a bicycle taken as a complete assembly. The frame and wheels have a lot more to do with this. The total flexibility is the sum of the individual flexibilities, and the total stiffness is the inverse of the total flexibility. So, while external bearing BB's with large diameter spindles and cranks arms with large cross-sections and larger bcd's may be individually stiffer than traditional designs with internal BB's and square taper spindles, the overall difference is relatively small. Futheremore, external BB's increase the effective overall lateral flexibility of a bicycle assembly, because they increase the Q-factor which increases the eccenticity of the force application point on the pedal relative to the plane of the bicycle frame. This in turn results in a greater torsional moment, which results in greater out-of-plane deflection of the frame and wheels. So, in the end, I don't see the need to worry about manufacturer's claims regarding relative stiffness of different quality cranksets, and am more concerned with quality factors such as roundness of chainrings and quality of bearings.
Bingo. I ride a CF road bike, and I thought the frame was soft. Turns out at 200lbs I was heavy enough to flex to stock wheelset bad enough to make it hit the brakes unless they were adjusted very loosely. Got 32h mavic cxp33s and the bike all of a sudden is rock solid.

What's really funny is all these people talking about crank stiffness that run big gear setups that minimize torque to the bike.
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Old 01-17-11, 11:48 AM   #24
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What's really funny is all these people talking about crank stiffness that run big gear setups that minimize torque to the bike.
My lack of reading comprehension is right on par with your ability to form a proper sentence.
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Old 01-18-11, 07:01 AM   #25
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