Castelli Custom BTW Speed Suit

The BTW Speed Suit delivers some serious velocity, hence its name – short for ‘balls to the wall’, an expression used by pilots flying at full throttle. It offers an impressive 3% aero savings above our already fast Sanremo Speed Suit, particularly in the racy 45-60kmph range.

Designed for those close competitions when you're riding all in, it was developed with the help of cutting-edge technology, including wind tunnel testing and CFD analysis, to maximise its racing potential. It therefore features dimpled shoulder and sleeve fabric for enhanced boundary-layer aerodynamics, a smooth body for minimal laminar flow and a short portion primed for speed.

However, enjoyment wasn't sacrificed in the name of velocity, since the suit is made from breathable, stretchy fabrics that will stay dry and remain comfortable, even when you're riding hard or changing positions. It also benefits from our pro-level seat pad, with its cushiony layers and gel inserts, made for enduring softness.

Available in your team's graphics through our custom programme, this fast suit will be your firm race-day favourite.

  • Designed using extensive research and refined construction, for speed with comfort
  • With dimpled shoulder and sleeve fabric
  • Body is smooth for minimal friction
  • Short portion based on our own technical Premio shorts
  • Built around the performance Progetto X2 Air Seamless pad
  • 2-way YKK® zipper enables venting on the move
  • Weigh 228g (M)
  • Made for temperatures of 14-32°C

Why Castelli Custom

Find out why our Servizio Corse Castelli Custom programme is the right choice for your club, team or group.

How it works

Get your custom-manufactured Castelli Kit in just 7 easy steps.

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Size guides

Get the perfect performance fit with more size options and expert sizing help.