Shimano's latest move in the world of cycling is a significant one, offering a range of new options for its GRX gravel groupset. The company has introduced shorter crank lengths and larger chainrings, aiming to cater to a wider range of riders and riding styles. This development is particularly interesting, as it challenges the traditional norms of crank length and chainring size, and it's worth delving into why this matters and what it could mean for the future of gravel cycling.
A Shift in Crank Length
One of the most notable changes is the introduction of 160mm and 165mm crank lengths, alongside the existing 170mm, 172.5mm, and 175mm options. This shift towards shorter cranks is an interesting development, especially given the recent trend of professional cyclists experimenting with even shorter lengths, such as Jonas Vingegaard's 150mm cranks. Shimano's decision to offer these shorter cranks is likely driven by the desire to improve pedaling efficiency and reduce joint strain, particularly for long gravel rides and races.
In my opinion, this move is a smart one. While longer cranks have traditionally been favored for their balance of rotational inertia, rotational speed, frame design considerations, and biometric factors, the trend towards shorter cranks is undeniable. Personally, I think this shift will be particularly beneficial for shorter riders, who may find that these new crank lengths offer a more comfortable and efficient riding experience.
Larger Chainrings for Faster Riders
Another significant change is the addition of 44-tooth and 46-tooth chainrings to the GRX RX800 series. This move is aimed at faster riders who want to spin more efficiently, and it's an interesting development given the debate around the optimal chainring size for gravel racing. Shimano's claim that these larger chainrings offer lower friction due to reduced chain articulation is an intriguing one, and it's worth considering the implications of this change.
What makes this particularly fascinating is the potential impact on the overall riding experience. While the effect of lower chain-link articulation and a straighter chainline may not be as significant as Shimano suggests, the fact that these larger chainrings place the chain more towards the middle of the cassette could have a noticeable impact on performance. In my opinion, this change is a welcome one for those who ride predominantly in flatter areas, as it offers a more efficient and responsive riding experience.
SRAM's Lead
It's worth noting that SRAM has beaten Shimano to the punch in both of these areas. The company's Red XPLR and Force XPLR cranksets offer a range of crank lengths, including 160mm and 165mm, and larger chainrings in 38, 40, 42, 44, and 46-tooth sizes. This move by SRAM highlights the competitive landscape in the cycling industry and the ongoing battle for innovation and market share.
Broader Implications
The introduction of these new options by Shimano raises a deeper question about the future of gravel cycling and the role of component manufacturers in shaping the sport. As the sport continues to evolve and attract a wider range of riders, it's likely that we'll see more experimentation with crank lengths and chainring sizes, driven by the desire for improved performance and efficiency.
In conclusion, Shimano's latest move is an interesting one, offering a range of new options for its GRX gravel groupset. The introduction of shorter crank lengths and larger chainrings is a smart move that challenges traditional norms and offers a range of benefits for riders. While SRAM has beaten Shimano to the punch in some areas, the competition is healthy, and it's likely that we'll see more innovation and development in the future of gravel cycling.
