Shorter cranks and new developments: Shimano expands its GRX group for gravel

Shimano continues to evolve its GRX ecosystem with an update that, without changing the architecture of the group, expands the options for development and ergonomics. The Japanese brand introduces new larger chainrings and increases the range of crank lengths, two seemingly simple changes that, in practice, allow for much better adjustment of the bike to the terrain and the cyclist.

SHIMANO expands the GRX with new developments and shorter cranks to fine-tune gravel to the millimeter

Gravel has progressively shifted towards faster scenarios, especially in competition. Proof of this is the arrival of new 44 and 46-tooth chainrings within the GRX range, which add to the existing options of 40 and 42.

This expansion is not coincidental. On fast or relatively flat routes, the limit is usually not in the ability to climb, but in being able to keep pushing when speed increases. With larger chainrings, the cyclist can maintain high speeds with a more stable cadence, also reducing the working angle of the chain and, with it, friction.

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From a technical standpoint, Shimano maintains full compatibility with current GRX configurations, both in single and double chainring setups, and in the RX600 and RX800 series. This allows for development updates without the need to change the rest of the transmission, something particularly relevant in a segment where configurations are becoming increasingly specific.

Shorter crank lengths, a trend that is consolidating

Even more interesting is the expansion in crank lengths within the RX810 range. The traditional sizes of 170, 172.5, and 175 mm are now joined by options of 165 and 160 mm.

This move follows an increasingly visible trend in road, MTB, and gravel, where the use of shorter cranks is gaining ground due to their biomechanical and dynamic advantages. Reducing crank length leads to more circular pedaling and facilitates maintaining high cadences, which is key in prolonged efforts.

Additionally, it allows for a slight opening of the hip angle at the top of the pedal stroke, which can translate into greater comfort on long rides and a reduction in stress on knees and hips. In gravel, where long days and accumulated fatigue are common, this type of adjustment makes even more sense.

There are also implications for the bike's behavior. Shorter cranks reduce the risk of impacts with the terrain in technical areas or ruts, which is especially relevant in bikes with a low bottom bracket or in demanding off-road sections.

With this update, the GRX is reinforced as a flexible platform, capable of adapting to both competitive use in fast races and long-distance adventures where efficiency and comfort make the difference.