KOLOSSOS OVERSIZED DERAILLEUR CAGES
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Description
Kogel is bringing low friction and precise shifting to GRX 12-speed gravel bikes with this Kolossos oversized derailleur cage
This upgraded cage fits mechanical12-speed (RX820 series) drivetrains for Shimano GRX 1X rear derailleurs .
About our Kolossos Oversized Derailleur Cage
Named after the Greek word for a statue, the Kolossos Shimano GRX 12-Speed Oversized Derailleur Cage features large pulleys (18-tooth narrow-wide bottom and 14-tooth top) and is constructed with our strongest cage design yet.
Designed to enhance chain retention and reduce friction, Kolossos cages are a critical component for gravel riders seeking top performance.
The overall length of the Kolossos is within a few mm of your stock cage, so ground clearance is not a concern. It is also equipped with road seals for optimal efficiency, but can easily be switched to cross seals for wet riding conditions.
Fitment
This cage is actually the same as our XTR 12 speed MTB cage and works perfectly on 1x gravel derailleurs. GRX 12 speed (RX820 series) only.
If you run a front derailleur on your gravel bike, have a look at our Kolossos cage for GRX 11 speed. It runs well on a 12 speed 2x derailleur.
**Kolossos is a component upgrade for existing rear derailleur. Derailleur not included**
I’ve been using the Kolosos, and BB for an year now, they still perform as it they were brand new!!! Shifting improved and going downhill with other people is where you will really see the ceramic bearings do their thing!!!
The Kolossos is definitely my favorite upgrade on my Orbea Occam. It shifts a lot smoother and it looks RAD! I went with a black cage, gold pulleys, & oil slick bolts. It's really cool how you can customize it to your bike. Highly recommend!
The setup has worked so well for me, it’s almost shocking. The hike is a hardtail, and despite this, I’m able to run the derailleur with the clutch off for all my off-road riding, without chain drops. So I get extra drag reduction! I also have to powershift a lot on my local terrain, and it always works. The claimed stiffness is real. Love it!
Much stiffer than my stock cage and looks way better!
Experience a silky smooth drivetrain
No amount of chain lube or coating can eliminate your rear derailleur's inherent design limitations. The path a chain takes during each revolution requires passing through a chicane of derailleur cage pulleys diminishing your return on each pedal stroke. It's a drag on all geared bikes and why your stock rear derailleur will never perform as efficiently as one with an oversized derailleur cage.
LEARN HOW TO INSTALL YOUR KOLOSSOS
Installation is easy, but does require disassembly of the stock cage.
The process takes roughly 20 minutes, including minor adjustments to the B-screw and limit screws to fine tune placement on the bike.
Frequently asked questions
How hard is it to install an Oversized Derailleur cage?
Installing an oversized derailleur cage is best left to expert level mechanics. Derailleur manufacturers do not support disassembly of the derailleur. For this reason online instructions will be limited.
The installation procedure is also different for each model. Some types are straight forward, with some types you need to disassemble the entire cage and use proprietary tools for the installation. With others you run the risk of having to rebuild the clutch if the parts pop out while you’re happily tooling away. Derailleur failures are typically expensive: the chances of breaking a wheel or a seat stay are probably not worth the risk.
Kogel recommends leaving the installation to a professional.
Will my existing chain work?
It depends on the model. Typically Kolossos for road derailleurs require a slightly longer chain than the stock cage. If your derailleur was built for a 1x setup, typically the upper pulley is off set from the pivot point and we can design it in such a way that you can use the same chain length.
Will I notice a difference in performance?
Yes and No. Kolossos has been designed to shift just as accurate as your stock derailleur cage. You will notice reduced drive train friction. Upgrading to an oversized derailleur cage is one step in the eternal search to go faster with less energy.
Are Oversized Derailleur cages loud?
The only sound you will hear is from using aluminum wheels instead of plastic. Aluminum wheels are stiffer and more durable than their plastic counterparts at the expense of a faint rattle when the chain runs across the cogs. We like to call it the sound of speed.
What are the downsides to an oversized derailleur cage?
- Some installation requires a new chain
- Slight reduction of ground clearance on road bikes. Gravel and MTB Kolossos are the same length as the stock cage
- Your friends will envy you
