The IRC Boken is a gravel tyre that is claimed to offer good performance on a wide range of surfaces. It is a very fast tyre with minimal tread, but the actual usage is more limited than you might expect.
IRC makes some bold claims for the Boken, which is constructed using a compound it calls 'Ultra Gummy' that offers 'insane bite on obstacles'. The conditions that IRC claims it is suited to range from 'Hard Pack' to 'Loose Dry' (in its own range of criteria, which takes in 'Rocky Broken' and 'Loose Over Hard'), buts fall short of recommending it for anything loamy or wet, and looking at the tyre you can see why.
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The tread is minimal, looking very similar to a cyclo-cross tyre aimed towards sand and dunes, with a file type tread design, with some wider but still low profile tread on the far edges.
Installation was relatively simple, taking a little more effort than some to get onto the rim but by no means a challenge, and then it inflated quickly and with just a track pump.
Given the stated size, 700x36, they actually pumped up much wider, measuring 39mm. This is on a rim with a 22mm internal width, which is wider than some but by no means extreme for a gravel setup. While this difference in stated size is quite common, I checked with IRC and for the Boken 36 it has them tested at 37.6mm on a 21mm rim, and 39.5mm on a 25mm rim, both at 60psi.
The tyres show a pressure range recommendation of 45-60psi and officially IRC cannot recommend less for legal reasons. This range will seem too high for some, especially for lighter riders and those who run tubeless. (IRC is not alone – many other brands will show a pressure that is higher than many riders will choose to run, an issue that likely has its roots with the outdated ERTRO tyre size and pressure standards that are due a change.)
My initial thought when riding was how quiet they are, both on surfaced roads and hard pack. While some tyres can drone, the Bokens are incredibly smooth and quiet. They feel fast, too, really fast. Given the tread design this might not be too surprising, but even when compared to slick tyres of a similar size the Boken is rapid.
At 477g the weight is reasonable, perhaps helped by the fact that there is no puncture protection layer, and while it may just be luck, I had no punctures despite some really challenging and varied rides while testing.
Although not listed, the threads per inch (TPI) of 60 is quite basic and low; many similar tyres and especially at this price will be 120TPI or even higher. In theory, a higher TPI would make them lighter and more supple, although it's not always so simple. For example, they feel far more supple to ride than the Hutchinson Touareg I tested for off-road.cc, which has a 120TPI casing.
So do they offer the 'insane bite' that is claimed? Not really. On dry tarmac they feel incredible in the corners, like they have endless grip, and I was really able to lean sharply into the corners, but this isn't a pure road tyre. Off road, things are a little different, and on anything even slightly loose they slide out easily in faster corners, including your typical British forest road. While they're not claimed to work well on wet surfaces, on a damp track and so long as there is no mud they do grip nicely.
Initially I tested them at the lowest recommended pressure of 45psi and the drifts were quite extreme at times. Legal recommendations aside, I dropped them lower, down to 35psi front and 38psi rear, and this did improve things a little, but they will still drift through looser corners.
The grip, or lack of, can be a little disconcerting at times, but strangely I did find I got used to them and when they do slide it is predictable. The only time it became an issue was on tracks I did not know and with corners that tightened unexpectedly, or where the line became looser mid corner.
Any attempt to ride the Boken on muddy tracks and the lack of grip is very obvious: traction uphill or around corners is compromised further. It isn't a tyre recommended or aimed at wetter riding, so it isn't something I can be too critical about.
> Buyer’s Guide: 26 of the best gravel bike tyres
At £50 per tyre, it isn't a budget option and there are many cheaper ones available, such as the Hutchinson Overide at just £33.99 or the Michelin Power Gravel that Stu liked recently. It is by no means the most expensive, though, with the Pirelli Cinturato Gravel H tyre being £5 more and sharing a very similar style and design, although that does at least have a higher 127TPI casing.
If racing or perhaps even KOM/PB hunting is your thing then the Boken might appeal, as it certainly does deliver a seriously quick ride. It might lack grip in some or perhaps most typical conditions, but after a while I did learn to read and adjust to the grip on offer and if you know it's going to be dry it might be worth a shot for the pure speed on offer.
Superfast gravel tyre that could be ideal for certain terrain and conditions, but limited use for typical British riding
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Make and model: IRC Boken gravel tyre
Tell us what the product is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?
IRC says, 'Ride on gravel, pavement, dirt, single track in the forest, wherever you go, this new generation tire has a unique center proﬁle tread for smooth surfaces while side knobs provide traction and control in softer terrain.'
Tell us some more about the technical aspects of the product?
700 x 36 stated size, Tubeless Ready, 60TPI carcass, Aramid folding bead, 45-60PSI recommendation.
- Ultra gummy compound for insane bite on nasty obstacles
- Developed for Extreme Gravel Racing Or Riding
- Tubeless Ready
Rate the product for quality of construction:
It seems well constructed with no issues, though 60TPI is lower than I would expect for this price. Installation was fairly easy.
Rate the product for performance:
On some trails, either dry and not loose or slippery, they do perform well. Roll very quickly and very quiet. But IRC official recommendations of the terrain they suit is a little far off where I found them to perform well.
Rate the product for durability:
No punctures in use, no signs of cuts or abrasions.
Rate the product for weight (if applicable)
Reasonable weight for the size and style of tyre.
Rate the product for comfort (if applicable)
Very quiet and despite a low TPI, they were comfortable.
Rate the product for value:
Not as good value as other similar tyres.
Tell us how the product performed overall when used for its designed purpose
Very fast, but also very sketchy in the corners. IRC claims it can cope with 'Hard Pack' to 'Loose Dry', but this wasn't my experience. In the corners on loose terrain it has very little grip.
Tell us what you particularly liked about the product
Quiet on roads and tracks and very quick. On the right kind of surface (dry, hard pack or very slightly damp without mud) it excels, but this is quite a narrow window.
Tell us what you particularly disliked about the product
The official recommended pressures were far too high for me, for this style of tyre and for best performance.
How does the price compare to that of similar products in the market, including ones recently tested on road.cc?
More expensive than most other gravel tyres, including the Hutchinson Overide at just £33.99 or the Michelin Power Gravel. Not quite the most expensive, though, with the Pirelli Cinturato Gravel H tyre £5 more and sharing a very similar style and design, although that does have a 127TPI casing.
Did you enjoy using the product? Yes, although only in good conditions.
Would you consider buying the product? Yes, but only if I had a race or big event coming up and wanted something really quick.
Would you recommend the product to a friend? Possibly
Use this box to explain your overall score
It has the potential to be excellent and faster than most other tyres I have tested – but only in a narrow window of conditions and surfaces. On long, straight US-style gravel roads it might excel, but in the UK it's far more limited. The price is also a big factor, and more than most others.
Age: 35 Height: 168 Weight: 62
I usually ride: My best bike is: Cannondale SystemSix
I've been riding for: Over 20 years I ride: Every day I would class myself as: Expert
I regularly do the following types of riding: road racing, cyclo cross, sportives, mtb,
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