Tom has written for BikeRadar, MBUK and Cycling Plus, and was previously technical editor of What Mountain Bike magazine. He has a particular focus on mountain bikes, but spends plenty of time on gravel bikes, too. Tom Marvin is a technical editor at and MBUK magazine. There’s enough support to allow you to push the bike through rollers and berms, generating extra speed, without it feeling too wallowy. On chattery trails, the harder-compound rear tyre skips around a bit, but the shape of the bike means you can keep it in check and generally ride it out until you hit the next smooth section of trail. Its rear suspension isn’t the most refined out there, with a hint of kick on the biggest impacts, but for the most part it’s well-controlled and predictable, once you’ve dialled in the rebound. The Bossnut continues to impress on descents too. The Trail Boss at the rear is predictable in looser conditions, although if you’re going to ride the muddiest of tracks, you’ll want more traction. That grippy front tyre, which has a good shape on the 29mm (internal) rim, gives you confidence to hit corners with decent speed, knowing that it’ll likely keep on gripping through to the exit. The Bossnut is eager to accelerate and, with its neutral shape, is easy to control around corners and pop off rollers and roots. On flatter, pedalling-heavy trails, there’s a fair bit of zing to the ride. This is helped by the faster-rolling Trail Boss rear tyre, which doesn’t suck too much speed. There’s no low-speed compression lever on the shock, which would help temper any bob, but when sitting and spinning it’s fairly efficient.
On climbs, it’s fairly stable, unless you’re really hauling on the pedals. It’s no surprise the Bossnut is so popular because it provides the best all-round trail performance of any bike at this price. WTB i29 rims provide a wide base for the Vigilante and Trail Boss tyres from the same stable – a highlight being the High Grip compound used on the heavily-treaded front tyre. SRAM’s new SX Eagle drivetrain provides the drive, with its 11-50t cassette, while its Level T brakes bring it to a halt.
Up front there’s a 130mm-travel RockShox Recon RL fork, with adjustable low-speed compression and rebound damping. SRAM features heavily on the Bossnut, taking care of both the drivetrain and the suspension. The seat tube is fairly long, at 480mm, while the chainstays are relatively short, at 436mm, and the bottom bracket sits 24mm below the axles. On the large, that means a reach of 460mm, a 66-degree head angle and 74.5-degree seat angle. While not revolutionary, the geometry is on the money for an easy-riding trail bike. The Calibre Bossnut is an easy-riding trail bike.
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