For those looking for every performance gain possible, Kogel is at it again. This time, their Kolossos oversized derailleur cage family has expanded into the world of MTB. Specifically, for the likes of SRAM Eagle rear derailleurs.

Kolossos oversized MTB derailleur cage for SRAM Eagle bottom

You may recall that when Kogel introduced the Kolossus system for road and gravel bikes, at the time, they claimed it was the stiffest cage on the market in terms of road and gravel rear derailleurs. Even so, that wasn’t stiff enough to qualify as a mountain bike derailleur cage, so the Kolossos SRAM Eagle has put on some bulk with a heavily reinforced cage design. In spite of the larger 19 tooth bottom pulley and 14 tooth top pulley, the Kolossos Eagle is within 2mm of the stock Eagle cage, and Kogel claims that it’s nearly the same weight.

Kolossos oversized MTB derailleur cage for SRAM Eagle side

So if it’s roughly the same size and weight as the stock cage, why bother upgrading? Like all of Kogel’s Kolossos systems, they claim that it reduces drivetrain friction while retaining shifting accuracy and chain retention. That includes lower rolling resistance from the road seals used on the bearings, though they recommend that you swap to their cross seals for “wet riding environments.”

Designed to fit both mechanical and AXS versions of SRAM Eagle derailleurs, each Kolossos is priced at $399. Keep in mind that this is just for the cage and pulleys – you’ll still need to provide your own derailleur.

Kolossos oversized MTB derailleur cage for SRAM Eagle custom

And if a $400 derailleur cage isn’t exclusive enough, you can also customize your Kolossos system. With the exception of titanium bolts, the choice of custom anodized colors for each component is available free of charge. Titanium bolts are available for an extra $20 in six colors, including oil slick.


  1. VazzedUp on

    Love the promo of the guy pushing his bike uphill before failing to take almost single pedal stroke on the way down, think I counted 2 complete revolutions, where you can’t see the drivetrain in action.
    Great advert for something thats meant to improve drivetrain efficiency and shifting????
    Must be all about the bling then?

  2. Skeen on

    I hadn’t bothered to watch the video until it was referenced in the comments. And yes, have to agree, how does that video have anything to do with performance improvements from the larger pullies that they advertise? Silly!

  3. blahblah1233445 on

    First of all, the whole idea of finding “minimal gains” from Your pulleys in MTB is an idiocy – within minutes from race start it will be all covered in dirt/dust/mud and all the so-called gains will go down the drain.
    Secondly – like someone already mentioned – all those crevices will be a mud magnet.

    At least they used smooth-teeth pulleys, instead of the narrow-wide ones, I’ll give them that. Seriously – NW on pulleys? Do they need that much chain retention?

  4. Tom on

    yes, it’s cool looking. No, it won’t actually make your bike (or you) perform any better. In fact, it will likely make it perform worse, between shifting performance, mud collection, and durability.

  5. mark hagen on

    Thing is siiiick. can’t wait to get my hands on one! They also make cages for gen 1 etap red in the old 11 speed variant. Kogel (unlike Sram) has not forgot about a still relevant group that many people sitll use. Thanks Kogel!!!

  6. Crash Bandicoot on

    We have a former pro that lives in my area, won’t name him since he runs a coaching business. He just does coaching for road and triathletes looking to improve. Charges big money and is apparently very demanding in terms of riding but gets results and I live in a wealthy part of the world plus he has very impressive palmares. I asked him about these jockey wheel things and he asked me “are you cracking the 58 minute mark on a 40k using a road bike? No? Shouldn’t even be on your radar until you do”. Dude makes a good point.


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