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30th April 2019 / Comments (1)

Teravail Cannonball 650bx47

Teravail Cannonball tread

What tyre for… Everything?

In a world where multi terrain tyres are becoming increasingly common, we look at the Teravail Cannonball 650bx47 to see how it stacks up. Is it a real contender or just another pretender?

Who are Teravail

USA based Teravail are not a big name in the UK yet, but we are sure that will change. They are backed by Quality Bike Products, the same folk that control Salsa and Surly, so their pedigree should not be in question. In the UK, distribution has been put in the very capable hands of Lyon Outdoor.

teravail packaging

Choices, choices, choices

The Teravail Cannonball is described as a ‘coarse gravel tyre’ and comes in either 700c or 650b. Details of the 700c are available on their website but for now, we will concentrate on the 650b which comes in 40mm or 47mm widths, in tan or black.

Not only, but also

In addition to colour and width options, there is a choice between a ‘Light and Supple’ or ‘Durable’ tyre. The Light and Supple tyre is lighter weight and promises a more supple (comfortable) ride. The Durable version is stiffer, more robust and presumably imparts a harsher ride. It features a layer of woven polymer composite reinforcement between the outer rubber and the inner casing. Running from bead to bead, this provides increased protection against abrasion and sharp debris.

teravail cannonball 650b mounted up

Putting the tyres to the test

The tyres we put to the test were the Teravail Cannonball ‘Light and Supple’ 650bx47 variant.

Teravail claim a weight of 525g, so I was pleased that they weighed in at 515g.

Fitting was painless. While I had to use a tyre lever for the final nudge onto the rim, I did not have to try too hard. The beads seated comparatively easily and even when deflated, the tyre still nestled comfortably against the rim. After the initial setup, the tyres remained fully inflated with no apparent loss of pressure.

Tread pattern – the technical bit

To aid traction, the tyres have ramped diamond shaped lugs on either side of the centre section. These are designed to compress and spread to provide grip when braking or accelerating on loose surfaces. The lugs pop back up as the tyre rotates, ejecting dirt and grit before rotating to repeat the compression phase. In real life, this translates to good tracking in the turns, and controlled cornering at speed.

Cannonball fitted to Mason x Hunt 650 Adventure Sport

Pressure Critical

Taking to some of the rocky and often loose surfaces in the wilds of Cumbria, we dropped the pressures to 34psi (rear tyre) and 32psi in the front. While this is accepted practice when riding  700c wheels, it does not translate well to 650b. Instead of getting improved traction and comfort, the tyres felt ready to roll off the rim. Back up to 40psi and they were perfect. It might take some experimentation to find your sweet spot but it is worth persevering.

Rolling on the Cannonball

Conclusion

To date the Cannonballs have covered approximately 600 miles  with minimal wear and lots of comfort. They are fast on and off road. When the going gets loose, they provide plenty of grip and traction but you probably shouldn’t expect too much when it gets slippery.

When inflated to 40psi, the tyre (rather disappointingly) came up at 43mm wide on a set of Mason x Hunt Adventure Sport 650b wheels, 4mm less than claimed.

At £55 each the Teravail Cannonball is not a cheap tyre, but are a good all round, fast rolling tyre.

Terravail Cannonball

£55.00
8.5

General all condition tyre for year round riding - except winter!

8.5/10

Pros

  • Fast rolling and comfortable
  • Traction on hard pack and loose gravel
  • Durable, even with the Light and Supple sidewall

Cons

  • Expensive
  • Not true to size

Last modified: 8th June 2019

One Response to :
Teravail Cannonball 650bx47

  1. Bill McGair says:

    This tire is extremely confusing given that all three versions have different listed weights.

    Tan “light and supple”: 510g
    Black “light and supple”: 545g
    Black “durable”: 550g

    What the hell is the point if the black light and supple when its no such thing!

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