This model will fit on 105 R7100 electronic and R7000 derailleurs. This includes short (SS) and medium (GS) cage lengths. 

Kolossos is the Greek word for a statue, much larger than the original subject. Seems fitting for an oversized derailleur cage.

Imagine the performance of replacing your stock pulleys with a ceramic 12-tooth top pulley and a 19-tooth bottom pulley built on the stiffest cage on the market.  Besides reduced friction, this cage is built with shifting accuracy, gravel worthiness, and chain retention in mind.

Please note** Installing this oversized derailleur cage typically requires replacing your chain to accommodate the larger pulleys. 

Compatibility

This cage works on both Shimano  R7100 & R7000 SS and GS cages with the following limitations for cassette sizes

• Shimano short SS cage max cassette size 30T
• Shimano mid GS cage max cassette 34T