The Tannus inserts do an excellent job of reducing vibrations as promised, but that’s not all – Each time your wheel meets a big root or a sharp rock, the usual clunk is greatly softened by the armour. This extra cushion helps reduce arm and hand fatigue, as less technical sections become butter-smooth and big hits don’t rattle your bones like they usually do. In addition to protecting against pinch-flats, the inserts provide 13-15mm of puncture protection on top, and an extra 2mm in the sidewalls.
I was pleased that I didn’t feel any degree of rebound from the inserts. Where tubed wheels at higher pressures can feel bouncy in rough terrain, the Tannus-equipped wheels felt just as planted and pliable as a tubeless setup (even more so at lower pressures)....
As the testing went on, I let the tubes fall to lower pressures. As I dropped to 16, then 15, then 14psi, I felt the ride change quite a bit. I think every rider who tries out Tannus Armour will find their own sweet spot with tire pressures, as how low you go depends on where your priorities lie.
I’m not sure how much the Tannus Armour helps with rolling resistance, as they claim. I can see how supporting the tire from inside would theoretically help it roll, but even at 18psi I mostly just felt like my wheels had gained a bit of weight. Climbing traction was excellent with the lower pressure, but not drastically better than a tubeless setup.
As I dropped to 15 and then 14psi, it was apparent that the inserts weren’t making up for the loss of rolling resistance created by the super low pressure. Adding weight and lowering tire pressure isn’t the best recipe for uphill performance, and unsurprisingly the lower the tires got the slower they felt on the climbs.
When downhill riding, as the tires got lower in pressure the traction only improved. I never had any issues with side roll while cornering, which was a bit surprising as these inserts don’t flare out against the inside of a tire like Cush Cores do. I didn’t feel like they increased sidewall stiffness, but they definitely discourage side roll even at really low pressures.
Once I hit 15psi the tires started feeling pretty squirmy on rough trails. With so little air in them, your tires feel different as they conform around roots and rocks. It’s tough to describe, but it’s not the same as a tubeless setup… the Tannus-equipped tires feel like they’re squishing and moving around more. Until you get used to the feel, it’s hard not to worry about your tires! At 14psi, I stopped twice coming down a trail to check if there was still air in my rear… and it was fine. Due to the difference in feel and the fact that I was climbing for every ride, this was the lowest I went with pressures. It’s not the lower limit by any means: Tannus’ website says some riders are running as little as 10psi.
This different ride feel isn’t necessarily a negative, it’s just something you’ll have to adjust to. While I did worry about the soft feeling tires more than once, I still charged every trail as hard as possible during my testing. I never managed to pinch a tube or roll a tire off a rim, never got a puncture, and the increased traction inspired me to push my speed limits on everything from flow lines to rock slabs. While Tannus doesn’t make big claims about their inserts protecting rims, the wheels I rode still looked brand new and ran perfectly true after my best efforts to thump them around.