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Kogel KOLOSSOS derailleur arm with pulleys / GRX / GRAVEL, black

RRP 474 €
379 €
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Bigger is faster.

Oversized derailleur pulleys are all the rage these days. Large derailleur pulleys cause less chain deflection and slower bearing rotation. Both lead to less friction and more efficient power transmission.

Main advantages:

Reduction of friction, while maintaining shifting accuracy.
Kolossos is 3x stiffer than competing products and 2x stiffer compared to the original pulley cage on your derailleur.
Long tooth profile on the lower pulley for better chain holding.
Ceramic bearings in the rollers for even lower friction.
Choice of three color variants.

Technical specification

The guide is designed for Shimano GRX (RD-RX810) and Ultegra RX800 gravel derailleurs.
Including mechanical and Di2.
This bracket also fits the GRX 1x derailleur (RD-RX812) and will allow shifting through the full range of the 11-42 cassette, but will leave plenty of space between the top pulley and the smaller cogs. Expect shifts to be less snappy in those last three gears.
Number of tubes on rollers: 12 (upper) and 19 (lower).

Category: Derailleur straps
Product details
Groupset Shimano GRX
product ID 185156
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Accessories for bicycle derailleurs from Kogel
The Texas brand Kogel will be loved by everyone who is focused even to the last details. It offers ceramic bottom brackets, oversize pulleys or full arms and also ceramic wheel bearings. They make bolts from titanium for mounting discs, baskets or stems, all tested by the pro Trek teams they sponsor.
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