British brand Orro has unveiled a new disc brake-specific aero bike called the Venturi that’s optimised for 28mm wide tyres.
The Venturi is made using Sigmatex spread tow carbon, a feature of the Orro Gold STC that we reviewed here on road.cc. The idea is that this reduces weight and increases stiffness.
“The sigmaST range of spread tow fabrics are very thin, are ultra lightweight, have near zero crimp and fewer interlacing points,” says Sigmatex. “This technology has improved mechanical performance at a reduced thickness and cost when compared to standard 2D fabrics using 1K fibres.”
A small window is left in the paintwork on the inside of the fork leg where you can see the spread tow weave.
Although there’s no reason that you can’t fit narrower tyres, of course, the Venturi is optimised for use with 28s. Why? Orro says it made this decision because wider tyres allow lower pressure, improved grip and reduced rolling resistance. Orro also says that wider tyres reduce the space between the frame and the wheels, improving the airflow and reducing drag.
We’re hearing of more bike and wheel manufacturers moving in this direction. 25mm tyres are still most popular on the road but some brands are reporting that 28s are now outselling 23s.
Orro says that during the 18 month development process it had various prototypes of the Venturi made with different carbon layups. A test team rode them blind in all kinds of situations before the decision on the production version was made.
The Venturi will be available in a flat mount disc brake configuration only – there is no rim brake model.
The front derailleur hanger is removable if you want a single chainring setup.
The medium size frames will arrive in the country in three weeks’ time with the large and small models following shortly afterwards.
A version built up with a Shimano Ultegra groupset is priced at £2,600. If you want to go with Ultegra Dics it’s £3,300 while a top-level Dura-Ace Di2 model is £5,500.
The Venturi comes in three different finishes: blue/white, white/red and black gold.
Mat has been in cycling media since 1996, on titles including BikeRadar, Total Bike, Total Mountain Bike, What Mountain Bike and Mountain Biking UK, and he has been editor of 220 Triathlon and Cycling Plus. Mat has been road.cc technical editor for over a decade, testing bikes, fettling the latest kit, and trying out the most up-to-the-minute clothing. We send him off around the world to get all the news from launches and shows too. He has won his category in Ironman UK 70.3 and finished on the podium in both marathons he has run. Mat is a Cambridge graduate who did a post-grad in magazine journalism, and he is a winner of the Cycling Media Award for Specialist Online Writer. Now pushing 50, he's riding road and gravel bikes most days for fun and fitness rather than training for competitions.