Another game changer?

Product Overview

Calibre Line 10


  • Aggressive geometry and spot on sizing. All mod-cons catered for.


  • Wouldn’t mind some slightly heavier duty/softer compound tyres.


Calibre Line 10 first ride


Price as reviewed:


The new Calibre Line 10 hardtail sports aggressive geometry and spot on sizing. All mod-cons catered for here, including a dropper.

By Charlie Collins

Calibre Line 10 need to know

  • Brand new hardcore hardtail from Calibre, designed with Bossnut ethos in mind
  • Contemporary geometry and great sizing in a low cost package
  • Well-rounded specification including dropper post and 1×10 gearing
  • Available in M, L, XL for now

calibre line 10

Game changer was the phrase many of us used when we first hopped aboard Calibre’s original Bossnut. For less than a grand, you get a full suspension trail bike with proper geometry and components, forming what is now our benchmark £1k trail bike. Their latest release, the Line 10 delves head first into the world of hardcore hardtails, drawing on the pedigree found in the Bossnut.

The premise behind it is simple, two mates searching for a winter hack at a price the wife can’t complain about. That price is £750 (with the £5 GO Outdoors discount card), bridging the gap between Calibre’s lower-end models and the Bossnut, providing a decent platform for both novice and experienced riders.

calibre line 10

First impressions of the Line 10 naturally come in the form of incredible value for money. You get a dropper post, 1×10 gearing, a wide handlebar, short stem, and air-sprung suspension forks. Together with a frame that features a slack 66.5° head angle, low bottom bracket height and contemporary sizing, they produce a ride that’s head and shoulders above what its price tag would suggest.

The ever-common notion of longer, lower and slacker geometry found in many of the latest higher-end bikes is very rare for hardtails in this price bracket. This modern geometry allows the Line 10 to be ridden as hard as the rider is able to thanks to a super balanced riding position. You feel right at home on classic undulating trail centre singletrack as well as technical steeper descents.

calibre line 10

In fact, the only thing holding it back is the thin walled, hard compound Schwalbe tyres. They meant riding with more tyre pressure than usual to help reduce the risk of punctures, but in turn giving a harsher ride on rougher terrain and less grip. Fortunately, the WTB i29 rims are tubeless compatible, so there’s room to upgrade the tyres and lose weight when riders want to make upgrades.

Although it missed our hardtail of the year test, there’s no doubt the Line 10 could be a headline act in the £750 category. The bomb-proof spec and modern geometry mean it’s certainly a bike Calibre’s competitors should be afraid of, and perhaps another game changer?

calibre line 10


Frame:6061 hydroformed double butted aluminium
Fork:RockShox Recon Silver, 120mm travel
Wheels:Formula hubs, WTB ST i29 rims, Schwalbe Hans Dampf/Rapid Rob 27.5x2.35/2.25in tyres
Drivetrain:Prowheel chainset, Shimano Deore shifter and SLX r-mech
Brakes:Shimano M506, 180/160mm
Components:Tranz-X 100mm dropper post, Calibre trail 45mm stem, Ritchey MTN Trail 760mm handlebar, Calibre trail Line 10 edition saddle
Weight:13.34kg (29.40lb)
Sizes:M, L, XL
Size ridden:L
Head angle:66.5°
Seat angle:73°
BB height:315mm
Front centre:739mm
Top tube:635mm