Is it time to rethink the traditional 1:1 or 1:1.2 ratio of chainrings to cassette spread in gravel bike gearing, and instead adopt a more aggressive, tightly spaced cassette with a single chainring, similar to those used in track and cyclocross, to better suit the demands of modern gravel racing?
The argument for wider cassette ranges and double chainrings has long been centered around the need for a broad range of gears to tackle the varied terrain and steep gradients often encountered in gravel racing. However, as the sport continues to evolve and courses become more technical and demanding, is it possible that a more tightly spaced cassette with a single chainring could offer improved performance and efficiency?
Proponents of this approach argue that a single chainring eliminates the need for front derailleur adjustments and reduces the risk of dropped chains, while a tightly spaced cassette allows for more precise control and better cadence management on technical descents and climbs. Additionally, the reduced weight and improved aerodynamics of a single chainring setup could provide a significant advantage in certain situations.
On the other hand, critics argue that a single chainring and tightly spaced cassette may not provide enough range for the extreme variations in terrain and gradient that are often encountered in gravel racing, and that the benefits of improved efficiency and control may be outweighed by the increased difficulty of tackling steep or technical sections.
What are the thoughts of experienced gravel riders and mechanics on this topic? Are there any potential drawbacks to adopting a single chainring and tightly spaced cassette that have not been considered, or are there any benefits that have been overlooked? Could this approach be the future of gravel bike gearing, or is it a recipe for disaster?