The On One Chunky Monkey Trail Extreme is a budget option that confidently tackles all but the deepest mud
Designed for pure grip and control, this Chunky Monkey 29er tyre is, On-One says, made in the same factory as Maxxis. A similarly low-priced, slimmer 2.25in Smorgasbord tyre with a firmer tread is also available.
The Trail Extreme tag denotes dual compound rubber with firmer, though still pretty soft, 50a durometer centre blocks and super-soft 42a edge blocks. This is a similar shoulder hardness to a Maxxis Super Tacky or Schwalbe Vertstar-style slow rebound rubber.
The Chunky Monkey isn’t rated as tubeless ready, and proved one of the harder tyres here to inflate. But once seated, with Stan’s sealant inside, we ran it at various pressures with zero issues. The sidewall protection is cheekily dubbed Eckso and the reinforced sides improve long-term durability.
Watch MBR struggle with the mud in Scotland
Currently on sale for £19.99 on the On-One site, the massive volume 2.4in tyre is one of the biggest 29er tyres you can buy (around the same size as a Schwalbe Magic Mary), with a 910g weight that’s reasonable for the size and aggression of the tread. The knob pattern uses a bridging or webbing between alternating centre blocks and it doesn’t roll over too slowly, considering the softness of the rubber used.
Cornering grip is great, and down various sketchy, steep trails the On One Chunky Monkey Trail Extreme handled everything in its path with confidence. The rubber compound handles all surfaces and textures with a nice, comfy, damped feel; in most situations it’s a tyre you don’t have to think about. In deep, gloopy mud, there are better solutions, as the broad profile can float rather than bite, but for the price it’s a steal.