Subtract the BB, weight is same. Add carbon spider (~$100), S-Works is lighter.
I have watched a weight around 455g for the S-Works. That's not so close to this Ciamillo crank but I agree that if you're looking for the cheapest gram saved this Ciamillo crank is not the best.
But the stiffness is gonna be impressive and the design very unique. And I don't speak about unlimited custom options that are making this product very interesting for people looking for optimized parts for their own use !
The last thing is that it's a 100% made in USA product and this only fact should be taken into consideration from US buyers who want to preserve their jobs.[/quote]
Also, I see a high possibility of grit, dirt and sand getting trapped in between the rods and areas making cleaning a rather tough job. I second artray's opinion on this.
We’ve posted a ton on these recently, and I started this as a mere update to the post earlier this week. But, the more I spoke with Ted, the more info came out and, well, here we are with lots of great details on the construction of his Gravitas cranks.
First off, they’re shipping. The first few units have mailed to some of his long-standing customers, and more will trickle out each week until they’re up to full speed. Orders placed now will likely ship in five or six weeks. Second, given the overriding theme among the comments, I asked directly about the stiffness of the design and why use carbon tubes. Here’s Ted’s response:
“We’re shooting for a sub-400g crankset that’s as stiff as or stiffer than Dura-Ace. The tubes are made by a company that specializes in hi-mod carbon tubes. We started this process by reverse engineering other cranks on the market, and this three-tube design can be made stiffer. The engineer designed these tubes to be 1.5x as stiff as the Rotor cranks, and the end result is slightly less than 1.5x because of the alloy parts interface. But, all we have to do is slightly increase the wall thickness and/or diameter of the tubes and we can make this the stiffest crank on the market without adding any weight. I wanted to have the lightest component in that arena without compromise.”
Read on to see how it all comes together, and get a promo code to enter to win a set of these and his brakes!
The Gravitas crankset's pins can be anodized or powdercoated in a variety of custom colors.
A two part process connects the carbon tubes and alloy ends. First, they’re bonded together. The bonding agent fills in any gaps, providing a solid connection. Then holes are bored through both the alloy parts and carbon tubes, and pins (blue in the top pic) are threaded together inside the holes. It’s called PTS for Pinned Tube System. These both lock the carbon tubes in place and prevent them from rotating.
The other side of the story is customization. This design lets them very easily make custom lengths and Q-factors without needing a ton of size-specific tooling. To get the exact length a rider needs/wants, they simply cut the tubes accordingly. Depending on the frame’s BB width, they have a range of spindle widths they can use, too, with spacers taking up any slack. A narrower 68mm BB shell would give you a wider range of customization than an 86mm one, of course.
They can also change the spider’s mounting width to tweak the spacing between chainrings to accommodate different rings in both 10- and 11-speed. The spider is interchangeable, letting you run standard or compact with the same arms.
Several spindle options will be offered to accommodate all modern bottom bracket sizes, BB30 first. A 24mm BSA spindle should be available in a couple weeks, which is likely to be a bit heavier because the spindle’s wall thickness will have to increase.
When this crank was first posted the weight was mentioned on more than one occasion and the assumption given by the posts was that this was going to be one of the lightest cranksets out there .It now seems to have changed in to a little bit lighter version of an undressed rotor crank . I liked the original design and I wonder why the change to the rods and how come the talk has gone from being super light to a stiffer heavier crank. For me the impact was about the weight of this crank and it seems to have been lost .
With the new design at 390 grams or whatever it will be, this is a big deal. This would match the lightest cranks made in the world and Ted says that he was still focused on stiffness.
I understand that the looks changed, and 60 grams might not sound like a huge difference. These cranks now have the potential to be the lightest and stiffest cranks ever made. I am not saying they are the lightest and stiffest, we will find out when we see some postings from the first users. Hopefully soon.
sedluk wrote:With the new design at 390 grams or whatever it will be, this is a big deal. This would match the lightest cranks made in the world and Ted says that he was still focused on stiffness.
At 390g, these are NOT the lightest cranks made. I currently own a set of lightning sl cranks (172.5). With the 110 spider they weigh about 356g. Before that I had vumaquads which came in at 378g w/ 50/34 rings.
It's quite possible they'll be able to go with 2 carbon tubes instead of 3 at some point in the future, that would (probably) make it the lightest crankset, but not yet.
I do think they look better than the lightning cranks (the vumaquads looked better as well), but I'm gonna stick to the true WW thing here and go w/ lighter!
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Is anyone concerned that the cranks may not have undergone an appropriate testing regimen before being shipped, and with some novel design aspects and potential failure modes no less?http://www.bikerumor.com/2012/12/21/ciamillo-gravitas-cranks-update-construction-engineering-details-giveaway/ wrote:First off, they’re shipping. The first few units have mailed to some of his long-standing customers, and more will trickle out each week until they’re up to full speed.
the weight is mediocre for the price. exclusive unique design is what will sell these boutique cranks.
the sram red bb30 crankset is comparable on weight <400gm and proven in the toughest races in pro tour calendar..
2017 Giant TCR Advanced SL 0 DI2 9150
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