The Sirrus Carbon’s radical frame is designed for compliance on city streets and gravel, according to Specialized

By Paul Norman

Published: Tuesday, 28 March 2023 at 12:00 am

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Specialized has launched the new Sirrus Carbon, a premium hybrid bike that dispenses with the lower half of the seat tube in a radical 1x-specific design said to improve comfort.

In a design similar to that we saw from the prototype Rondo Ruut gravel bike, the Sirrus Carbon’s dropped seatstays join midway down the seat tube.

However, instead of the seat tube then continuing to the bottom bracket, it splits off to join the down tube.

Specialized calls this design a Compliance Junction and says “it’s been designed to have just the right amount of flex and forgiveness across the carbon frame without sacrificing performance and efficiency”.

There are two bikes in the range at launch, the Sirrus 6.0 priced at £2,400 / $3,000, and the Sirrus X 5.0 priced at £1,950 / $2,250.