One Skinsuit Aero Testing

Key finding: Wind tunnel testing at Silverstone Sports Engineering Hub found the Rule 28 One TT Suit required up to 13.43W less power than its predecessor, the TT Suit 2.0, across the 40–50 km/h range where most time trials are raced — equivalent to a rider finishing roughly 72m ahead of the previous suit over a flat 10-mile time trial at 50 km/h. Above 50 km/h, Rule 28 recommends its Neo Suit for riders regularly racing above that speed.

Power required (Watts) to maintain speed, by suit

Positive = One TT Suit faster. Note the crossover above 50 km/h — see Key Findings below.

When it comes to time trial cycling, every watt counts. That's why at Rule 28 Clothing Ltd., we leave no stone unturned in the pursuit of speed. Our single-layer time trial suit, the One TT Suit, has undergone rigorous testing at the world-renowned Silverstone Sports Engineering Hub Wind Tunnel to ensure it delivers unrivalled aerodynamic performance in its class.

The Testing Process

To truly understand how our new skinsuit performs, we opted for a highly controlled environment. Instead of testing on a pedalling rider, we used a 3D-printed mannequin of a time-triallist on a TT bike. This method provided us with precise insights into how even small modifications to fabrics and suit design impacted aerodynamic efficiency.

Performance Comparison: One TT Suit vs. TT Suit 2.0

Our wind tunnel tests were conducted across a range of speeds, starting at 40 km/h and increasing to 60 km/h in increments of 5 km/h, comparing the previous suit design (TT Suit 2.0) with the One TT Suit.

Key Findings

Up to 13.43W saved at 45 km/h — the One TT Suit outperforms the TT Suit 2.0 throughout the 40–50 km/h range, where most time trials are raced.

Above 50 km/h, the TT Suit 2.0 performs better — the power difference reverses at 55–60 km/h. Riders racing regularly above 50 km/h should look at the Neo Suit instead, which Rule 28 offers in versions optimised for both below and above 50 km/h.

Real World Savings

Over a flat 10-mile TT at 50 km/h, a saving of 6.45W would save this rider over 5.21 seconds.

Put another way: as this rider crossed the line in a One TT Suit, the TT Suit 2.0 would be about 72.3m (237.3ft) behind.

Conclusion

At Rule 28, our commitment to innovation and performance is unwavering. We are dedicated to providing athletes with the most advanced cycling gear on the market. Through meticulous wind tunnel testing, we've fine-tuned our skinsuit to ensure every watt is optimised, giving you the edge you need to outperform the competition.

FAQ

What power saving does the One TT Suit offer over the TT Suit 2.0?
Wind tunnel testing at Silverstone Sports Engineering Hub found the One TT Suit requires up to 13.43W less power than the TT Suit 2.0, with the biggest gains in the 40–50 km/h range where most time trials are raced.

Should I choose the One TT Suit or the Neo Suit?
It depends on your typical race speed. The One TT Suit outperforms the TT Suit 2.0 up to 50 km/h, but above that speed the aerodynamic advantage reverses. Riders regularly racing above 50 km/h should look at the Neo Suit, which Rule 28 offers in versions optimised for both below and above that threshold.

How much time would the One TT Suit save in a real race?
Over a flat 10-mile time trial at 50 km/h, the power saving translates to roughly 5.21 seconds — equivalent to finishing about 72 metres ahead of a rider in the TT Suit 2.0.

How was the One TT Suit tested?
It was tested in the Silverstone Sports Engineering Hub Wind Tunnel using a 3D-printed mannequin of a time-triallist on a TT bike, rather than a pedalling rider, to isolate the aerodynamic effect of fabric and suit design changes.

What speed range is the One TT Suit best suited for?
It performs best from 40–50 km/h. Above 50 km/h, the TT Suit 2.0 and Neo Suit become the stronger options.