This is not yet a proven scenario. We are still at the beginning of a trend that may fizzle out, but may also trigger the next major shift in mountain biking, especially in racing. Yet the discussion is very real. Several manufacturers are working on corresponding concepts but are keeping their cards close to their chest. BMC has already tested a 32-inch prototype in the context of the Cross-Country World Cup, and smaller manufacturers like Stoll, Actofive, Koba, and Salsa have already presented bikes with 32-inch wheels—albeit not necessarily for racing. But it’s precisely in racing where things get exciting.

The arguments for the big wheels are easy to explain. They roll more smoothly over obstacles, offer more contact patch, more traction, and can save time on fast, rough courses. Precisely where every percentage point counts in the World Cup, a technical advantage immediately becomes a sporting necessity. If the stopwatch shows that 32 inches is faster, hardly any top rider will voluntarily stick with 29 inches.

But bigger wheels need space. And space is the scarcest commodity on small frames. A 32-inch bike isn’t simply a 29er with larger wheels. Chainstays, tire clearance, seat tube, front end, bottom bracket height, freedom of movement while riding the bike: everything has to be rethought. Especially for smaller riders, every millimeter counts. What can be elegantly solved for a tall athlete can become an ergonomic compromise—or even a deal-breaker—on an XS frame.

This is precisely where the issue lies. The sport could shift in a direction where body size suddenly matters more than technique, courage, or dedication to training. Not because smaller riders ride less well, but because the fastest equipment might no longer fit them at all. That would be a quiet but massive shift. No official ban, no visible barrier, but ultimately a limit nonetheless.

Of course, engineers are working to prevent exactly that. There are reports of smaller prototypes, positive test rides, and manufacturers emphasizing that 32-inch bikes shouldn’t be reserved solely for tall riders. The example of Salsa also shows that a nearly complete size range is possible, though the 32-inch model starts at Small, whereas the 29er also comes in XS.

In terms of racing, 32-inch bikes may ultimately only gain traction on certain courses. Perhaps it will remain a niche for tall riders, marathoners, and tech enthusiasts. Or perhaps developers will find solutions that seem impossible today. But if 32-inch really does become the new standard in the World Cup, the sport must ask an uncomfortable question: Do we want races to be decided by talent, or by whether a rider’s body is big enough for the fastest bike?