Rule 28 builds its cycling kit in the wind tunnel and obsesses over the details that help the world's fastest riders go faster still. Then it hands the same kit to riders who mostly want a good morning in the hills.
The road climbing out of town ascends in long, unhurried switchbacks before it tips over toward the coast. At this hour there is no one else on it. The morning coffee was good, the air is still cool, and the only fixed point in the day is lunch somewhere with a view.
It is not, by any measure, a race. So why wear something developed in a wind tunnel?
Sam Calder, an architect by training, started Rule 28 out of frustration with the level of technology in the clothing currently on the market. “Brands made bold claims about their performance, but never backed them up. I wanted to change that.”
His first product was four prototype pairs of ribbed aero socks. That year, Team KGF wore them to win the British Track Championships.
Nine years on, the mission hasn't changed. Every piece is independently tested in a wind tunnel at Silverstone, on the edge of the Grand Prix circuit. The results are then published for all to see: watts saved, what each watt costs, and how competitors compare.
Rule 28 sponsors no major team. It doesn't need to. More than half of the world's best teams buy kit from the brand anyway, because the data is hard to argue with.
Over the past five years, men's and women's Tour de France champions have raced in its Aero Base Layer. At that level, riders are rarely short of free clothing. This was clothing they chose.
Along the way, the brand has been part of several World Championship wins and now reaches riders in more than fifty countries. In 2024 and 2025 it went further, releasing to the public aerodynamic technologies that had previously been worn only at the very top of the sport.
That lineage lives on in the race pieces: the cycling skinsuit, the Aero Base Layer, and upgrades for those who prefer a triathlon suit.
None of this needs to cross your mind on the climb out of Pollença, or on any mountain road in Spain, France or Italy.
The jerseys and bib shorts that make up most of the collection, for men and women, are made for days like this: long, unhurried, and repeated across a week. The rigour that saved watts for Tour champions shows up here more quietly, in how the fabric sits and in how little you think about any of it by the third hour.
You may never need everything it can do. But there is a particular pleasure in knowing it's there.
Rule 28 publishes its testing in its journal and rides with its community on Strava.
*Image courtesy of Rule 28
