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.

This depends on the derailleur model. Some require special tools, others can be done with regular allen and torx keys. Please have a look at the installation video for your model for the specifics.

Probably not. Installing an oversized system demands a longer chain than the one used on a stock derailleur. The longer cage and larger wheels create a need for additional chain links.

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 effort.

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.

-Every installation requires a new chain

-A slight reduction of ground clearance due to the longer cage

-Your friends will envy you