Mason Cycles has unveiled a new version of its popular Definition aluminium endurance bike, the Definition Integrale option coming in a sportier geometry than the existing Definition 3 – which stays in the range – and with fully integrated brake hoses.
We’ve been huge fans of the Italy-built Mason Definition since it was introduced a decade ago; it’s a former road.cc Bike of the Year and the Definition 3 got a top-3 finish in road.cc Recommends Bikes of the Year 2024/25.
> Read our review of the Mason Definition 3.0
It’s the bike that Josh Ibbett rode to victory in the Transcontinental Race in 2015.
> Check out the Mason Definition that Josh Ibbett rode to Transcontinental Race victory in 2015
Why tinker with it, then?
“The Definition Integrale uses the DedaAR fork that we developed with Deda Elementi for the [titanium] Aspect Integrale,” says Mason Cycles founder and designer Dom Mason. “Once again, we don’t want to force anyone to go integrated if they don’t want to, so the original Definition 3 will remain.
“It’s the first major change to the Definition since we showed it to you in 2015. This one is a bit sportier with geometry tweaks to really bring out the performance of the tubeset and the new fork with a lower crown height. Also, it’s the first-ever white Mason.”
To explain the geometry changes, we’ll take the 56cm size as an example. This model has a stack height of 567.5mm and a reach of 392.5mm. That gives you a stack/reach of 1.45.
For comparison, the Definition 3 in a 56cm has a stack height of 579.7 and a reach of 388.3, giving a stack/reach of 1.49. In other words, the ride position on the Definition Integrale is a little lower and more stretched out. The idea is that you get “a faster, more attacking feel to the ride”, according to Mason Cycles. As with all Mason road models, there are eight sizes to choose from.
“The Definition Integrale sits beside the Definition3, which retains the same basis in fast endurance riding, but with a Mason Aperture fork and the Definition’s tried-and-tested geometry,” says Mason.
While the Definition 3 is compatible with mechanical groupsets, the Definition Integrale is intended for electronic shifting and features “discreet porting” for wired variants of Shimano Di2.
Dom Mason says, “The track record of the Definition speaks for itself, as many riders’ go-to choice for events like the Transcontinental Race and the London–Edinburgh–London. But, as I listened to rider feedback and explored new technical advances, I decided the Definition has even more to offer: even faster, even further.
“The latest electronic groupsets and Deda Elementi’s integrated components have enabled me to adopt a really focused approach for the Definition Integrale: revised geometry, a truly sporty feel, and minimal, clutter-free design.”
And Mason remains committed to aluminium as a frame material.
“For me, aluminium remains an amazing material for building fast, light bicycles,” says Dom Mason. “It’s durable and it’s comfortable over long distances. Collaborating with Dedacciai and with skilled Italian framebuilders, we’ve refined a tubeset and co-developed a fork that really enables us to fine-tune performance. I’m really excited about the Definition Integrale and the way it extends what we can achieve with modern aluminium design.”
The Definition Integrale comes with clearance for 35mm tyres and with mudguard eyelets. You can fit 32mm tyres with full mudguards. The DedaAR fork also has mudguard eyelets and routing for dynamo lighting. Both the Definition 3 and the Definition Integrale feature UDH dropouts.
> What is UDH and is it the future of all bikes? SRAM’s Universal Derailleur Hanger explained
The Mason Definition Integrale frame and fork package is priced at £1,550 with Shimano Di2 and SRAM AXS builds from £3,700.
The numbered Launch Edition (you need to order before 15th October for delivery in December) features a brushed brass head badge and is available in a ProcessWhite or PrismGreen finish.
