Ceramic Speed has the most advanced bicycle ceramic bearing upgrades available, and their Shimano 11s Alloy Pulley Wheels are a no-compromise option when it comes to ensuring every watt goes right into the road. Designed to work with both Shimano road and mountain derailleurs, the pulleys are shaped to minimize friction and keep an ideal chain path. This optimization is necessary to reap the most benefits from their Grade 3 Silicon Nitride ball bearings that provide the maximum possible roundness and highest quality surface finish. That means a 15% increase in hardness and a 100% increase in smoothness over other ceramic bearings on the market, resulting in lower operating temperatures for less corrosion, less wear, and less friction so these pulleys not only go faster but last 3 - 5 times as long as standard bearings as well.
With over 15 years of experience in ceramic bearings, Ceramic Speed is unrivaled in their development and sourcing of the highest quality materials for both longevity and performance. Every bearing is hand assembled in Denmark in a clean-room environment and is checked four times during the building process to a precision of 0.001 mm. Ceramic Speed's bearing upgrades are more than class leading. They're in a class entirely their own.
The Shimano 11s Alloy Pulley Wheels include two Shimano road or mountain compatible rear derailleur pulleys, a bottle of low-viscosity lubricant, and bearing spacers.
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1 of 2 customers found this review helpful.
So little gains, you can't quantify -but they're great for silent judgement.
So, you can't buy speed. How did Steven Hed put it? You're just off-setting poor training? That's really what these pulleys do. There's no hidden motor. There's no tricked out air-foil to give you lift. You're just trying to squeeze a couple watts of parasitic friction out of your drivetrain. Yeah, probably along the lines of a couple as in 2. An only while you're pedaling. There aren't any gains here while coasting.
In hand, these are noticeably smoother than SRAM BlackBox, Enduro Zero, and F1 Ceramic pulleys with similar hybrid ceramic bearings. I almost went with Kogel bearings until BKT had these on sale one day. These are my second experience with CeramicSpeed, in general. My first being ENVE carbon hubs (no complaints, yet).
I'm not sure how the longevity of these pulleys will play out. There are seals on the cartridge bearings, but there's an absence of dust caps covering the cartridge bearings. The provided bottle of lubrication feels more like a light oil instead of a typical water displacing grease. I like the choice of anodized aluminum for the teeth instead of Delrin. Not because of potentially wearing longer (probably the opposite), but because like my Ultegra 6800 in anodized anthracite -the chain locally wears off the anodizaton off the teeth. So even when the bike had a fresh wash, there is noticeable wear in the drivetrain. It's like pulling up in a freshly waxed sports car, but your exhaust tips are matte with black soot. This ain't no trailered show car.
In terms of making you go faster? You probably have the same effect of adding yoga to your cross-training, then removing like 10mm of headset spacers to make you more arrow. Personally, I can't numerically capture any gains by using these ceramic hybrid pulleys. They just genuinely smooth out your pedal stroke and they make you look the part.
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