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If bigger is better, really bigger must be more better, right? KCNC must think so with their as-yet-unreleased oversized aluminum derailleur pulley wheels. Coming in 12, 14 and 16 tooth counts, they require a special cage to fit them. They say research has shown that the larger wheels reduce drag, and these are rolling on better bearings and use drastically machined structures to create a premium offering. Overall, the package isn’t likely to save any weight over stock derailleurs since everything’s bigger and, we’re guessing, you’ll need to add several links back to the chain to keep everything working properly.

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Prices, weights and availability are all unknowns at this time.

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Their new floating rotor design could come in this oversized 254mm diameter. They joked that bigger, heavier (think “old guys that get fat in winter) riders need it to go downhilling, but the likely real use is big, heavy e-bikes that need the extra stopping power. They’ll also offer the post mount adapter to push your caliper out far enough to fit it.

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The floating design uses an aluminum fin on a steel braking surface, pinned to an aluminum carrier. No word on pricing for these yet, either.

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What is ready for retail is their new titanium 11-speed 11-42 cassette. The main cluster is full titanium with a 7075 aluminum large cog.

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The price is €640, which is considerably higher than comparable 11-speed cassettes from Shimano, etc., but at 307g, it’s also considerably lighter.

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This tops the size spectrum, slotting in on top of the full titanium 11-34 and 11-38 Shimano-compatible cassettes they already offer. The construction bolts individual 6/4 ti cogs onto a mono-block CNC machined AL7075 carrier, but this one gets V-shaped arms on the carrier as opposed to the radial design used on their other cassettes.

KCNC.com.tw

26 COMMENTS

  1. For 640 EUR, you can get two Sram XX1 or X01 cassettes at 263 grams each + an XD driver if you need one. Not only are the Sram top of the line cassettes lighter, offer a wider range (10-42 vs 11-42) and most likely shift better, they will also be more durable with steel cogs instead of titanium ones. That titanium cassette is one big fail.

  2. “They say research has shown that the larger wheels reduce drag…” Well, duh! They are rotating less, so less rotation = less friction.

    That said, the contact with the chain is increased, so where contact = friction, I am not quite seeing how this claim pans out. If anything, I’d think that the reduced friction due to a marginally larger rotation at the bearing is offset by the greater contact with the chain.

    • More chain wrap = better chain leverage and force distributed over a greater area = less energy required to overcome. Bigger pulleys = more pulley teeth = less pulley rotation= Less friction.

    • There is more contact between chain and pulley at any given time, but I don’t think that will increase friction, for a few reasons. 1. The increased contact means that pressure is distributed over a wider area, so you have more contact, but with less pressure on each point of contact, which generally roughly equals out. 2. The number of actual contact events will be the same as with a regular pulley, because these do not alter gear ratio. So, even though you have more teeth in contact with the chain at any given time, the number of tooth/chain link interfaces over the course of a ride will not be increased.

      In addition to those points, most of these low friction pulley/cage setups include a lighter tension spring, which further reduces friction, at the possible expense of chain retention.

      • The number of teeth/contact is not what adds or takes away friction, it is that the larger pulley diameter relieves chain wrap. The tighter the radius the chain wraps around, the more friction. The difference is small because the only load the lower length of the chain experiences is that of the cage’s spring.

  3. Titanium is bad material for most parts on a bike but I’d like to see someone make titanium rims just to see if it works.
    Aluminium dents easily and carbon can explode or suffer invisible damage leading to catastrophic failure.

      • Ti is better for cassettes than aluminum which many higher-end cassettes are, at least for the upper cogs. Steel is better than Ti but not as light. If a SRAM made their XX1 cassette with Ti, it would surely be lighter. It wouldn’t last as long(still better than aluminum) but it would last a while and be lighter.

      • Titanium has been used for rims in the past. I think Araya made some called Titan-Ace IIRC. I’m too lazy to hit the googles.

    • Carbon doesn’t really randomly explode, for many things, its far better than any metal now that we aren’t talking carbon bikes from the 90s.

  4. I am curious about those rotors. How much contact is there between the alu fins and the steel brake surface? Shimano does a full sandwich, but the others I have seen only have edge contact which seems like it would be of dubious benefit.

  5. Stirling, what is a bit of a question is: where do you find spare parts, new pulley wheels etc if this project does not take off and get long lived? A well known company, it is atleast possible you have easier to find spare parts.

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