Product Test: Arisun Mount Adams 27.5 X 2.0 TIRES

The Arisun Mount Adams tire was created to be the go-to tire for aggressive cross-country riders and racers. The Mount Adams came with a thick casing that made testers wonder if this pure cross-country tire could handle rocky terrain along with hardpack desert trails. Our local hardpack trails offered the perfect testing grounds to find out what these tires were capable of.

Tech features:

The Mount Adams comes with a tight, closely spaced tread pattern down the center of the tire with scattered and spread-out knobs along the outside to provide some confidence in corners. Arisun makes this tire to fit all three different rim diameters and two different widths within the tubeless lineup. Arisun sent us the 27.5×2.0 Mount Adams version, and the tires weighed 656 grams each (1.4 pounds). They retail for $40.

Field test results:

Our initial impression was that these tires looked fast and lightweight. We initially set the 27.5×2.0 front and rear tires on a Giant Anthem Advanced but eventually moved them over to a Rocky Mountain Thunderbolt to see how the tires fared on more aggressive trails. Testers were surprised when the rubber hit the scale, considering that most tires in this aggressive cross-country category come in at least 150 grams lighter. Installation was fairly simple, and the beads snapped in using only a floor pump. Both tires seated at about 25 psi on every installation. Arisun recommends running the tires between 35–65 psi, but when the pressure was dropped below the recommended setting, there was a dramatic increase in traction.  Ideal pressures were 26 psi for the front and 28 psi for the rear. With the lower psi, the tires hooked up much better on steep climbs and cornered well but had a little bounce on flat sections.

The aggressive side knobs hooked up well in turns and accelerated quickly out of corners, inspiring some confidence. Through rocky terrain and trails, the rear tire gripped well and rolled over technical sections with no flats. The front tire tended to slide off rockier sections and wanted to find small gaps in the rocks as opposed to rolling over them.

Steep technical climbs were probably the biggest drawback during testing. The tires spun loose if there were any loose-over-hardpack or rocky obstacles on moderate and steep climbs. Testers suspect this was due to the large distance between the center tread and outside knobs. Downhill speed was fast and required a little more preparation for braking, especially on anything other than hardpack terrain. Overall, durability was average, as the rear tire showed considerable wear within the first 100 miles.

If you are a racer on a budget, these tires could be a good option, especially if you are looking for an inexpensive training tire. The Mount Adams work well for trail riders looking for snappy and affordable rear tires, and they deliver on the promise of a well-rounded, tubeless-ready piece of rubber.



Mountain Bike Action is a monthly magazine devoted to all things mountain biking (yes, that’s 12 times a year because we never take a month off of mountain biking). It has been around since 1986 and we’re still having fun. Start a subscription by clicking here or calling (800) 767-0345. Available from the Apple Newsstand for reading on your iPad, iPhone or iPod Touch.

27.5 tiresMountain bike tirestire test