Unbound XL podium bikes: Rob Britton’s Factor Ostro Gravel vs Lachlan Morton’s Cannondale Topstone

Unbound XL podium bikes: Rob Britton’s Factor Ostro Gravel vs Lachlan Morton’s Cannondale Topstone

The two leading riders – and their bikes – from the 350-mile Unbound XL

Ryan Simonovich

Published: May 31, 2025 at 7:00 pm

Rob Britton pulled ahead of pre-race favorite Lachlan Morton to win the 2025 edition of Unbound Gravel’s XL race, setting the fastest-ever time of 17:49:51 hours. The Canadian finished more than five minutes ahead of Morton on the 350-mile course. 

Britton rode a bright orange Factor Ostro gravel bike with a 40mm Fox 32 Taper-Cast suspension fork, while Morton rode a Cannondale Topstone and opted for a rigid fork. 

Britton told BikeRadar after the finish that the Fox 32 TC was a critical component during his race-winning Unbound XL ride. 

"It just takes the edge off,” Britton said. “And like, over 17 and a half hours, taking the edge off makes a huge difference. My shoulders aren't sore. My wrists are fine. But if I'd had a rigid fork, I think it'd be a different story.” 

Britton’s orange bike is inspired by graffiti and has wolves on it. 


Read more from Unbound 2025:


“I love graffiti,” he said. “There's some wolves on there that you can't see us under mud, but yeah, I’ve got kind of an affection for wolves so I wanted one of those in there. The main director of design for Factor just did an incredible job last year. I think this is the best, the nicest bike I’ve ever owned.” 

Despite much pre-race hype about the chances for sticky, thick peanut butter mud, Britton said it didn’t play much of a factor in the racing.

“For all the crazy rain and what it could have been, it was totally fine,” he said. “That sun yesterday and the wind, it just evaporated everything. It's incredibly fast.” 

Britton did lube his chain several times over the course of the ultra-distance race, and said his gearing and tyre choices were perfect. 

“There was one section where I feel like, if we got there an hour earlier, we would have been in big trouble, but it was just fine,” second-place Morton added. 

In contrast to Britton, Morton used a rigid fork on his Cannondale, which he said is “just simple, you know".

Morton estimated that he spent about 50 per cent of the time on his aero extension, compared to the hoods or drops, while Britton said he spent around 40 per cent of his ride in the extensions, versus out of them.

Unbound XL 2025: Rob Britton's Factor Ostro Gravel
Rob Britton won the Unbound XL on his custom-painted Factor Ostro Gravel, which was the standard version and not the new Factor gravel bike that has been spotted at Unbound. Ryan Simonovich
Unbound XL 2025: Rob Britton's Factor Ostro Gravel
Britton used a 2x Shimano GRX drivetrain with Easton cranks. Ryan Simonovich
Unbound XL 2025: Rob Britton's Factor Ostro Gravel
The graphics on Britton’s bike were inspired by graffiti and wolves. Ryan Simonovich
Unbound XL 2025: Rob Britton's Factor Ostro Gravel
Two frame bags on either side of the top tube carried supplies, and two large water bottles provided hydration for the 350-mile race. Ryan Simonovich
Unbound XL 2025: Rob Britton's Factor Ostro Gravel
The Fox fork was critical for comfort during the race, according to Britton. Ryan Simonovich
Unbound XL 2025: Rob Britton's Factor Ostro Gravel
Britton rolled on Black Inc wheels. Ryan Simonovich
Unbound XL 2025: Rob Britton's Factor Ostro Gravel
A 45mm Schwalbe G-One RX Pro was mounted on the front. Ryan Simonovich
Unbound XL 2025: Rob Britton's Factor Ostro Gravel
A look at the Schwalbe’s tread. Ryan Simonovich
Unbound XL 2025: Rob Britton's Factor Ostro Gravel
Aero bars are a popular choice at ultra-distance races like Unbound XL. Ryan Simonovich
Unbound XL 2025: Rob Britton's Factor Ostro Gravel
A saddle bag and rear light for spares and through-the-night visibility. Ryan Simonovich
Unbound XL 2025: Rob Britton's Factor Ostro Gravel
A front light from Exposure sits neatly under the cockpit. Ryan Simonovich
Unbound XL 2025: Lachlan Morton's Cannondale Topstone
Lachlan Morton’s Cannondale Topstone. Note the hydration hose running from a bladder housed in the rear saddle bag. Ryan Simonovich
Unbound XL 2025: Lachlan Morton's Cannondale Topstone
Morton also had a 2x GRX drivetrain. Ryan Simonovich
Unbound XL 2025: Lachlan Morton's Cannondale Topstone
Mud and dust might be covering Morton’s bike, but it didn’t seem to slow him down much. Ryan Simonovich
Unbound XL 2025: Lachlan Morton's Cannondale Topstone
Morton’s saddle bag is mounted on a rear rack. Ryan Simonovich
Unbound XL 2025: Lachlan Morton's Cannondale Topstone
A Tailfin bag tucked nice and tidily under the aero bars. Ryan Simonovich
Unbound XL 2025: Lachlan Morton's Cannondale Topstone
Morton used Vittoria Terrano Dry tires. Ryan Simonovich
Unbound XL 2025: Lachlan Morton's Cannondale Topstone
A front angle of Morton’s aero bars, front light, and aero Tailfin bag. Ryan Simonovich