
The 29er mountain bike platform has proven itself in the world of cross-country mountain bike racing and these days the bigger wheels are slowly making their way deeper into all-mountain territory. The Kona Hei Hei 2-9 (pronounced “hey hey”) is the company’s first and only full suspension 29er that’s dripping with XC race cred while dipping its big fat toe into AM waters.
Frame & Geometry
First introduced in 2008, the Hei Hei 2-9 features hydroformed Scandium tubing for a strong, lightweight, and durable frame that looks like a work of art. Scandium tubing is made from an aluminum alloy that’s had its grains aligned by adding scandium to the mix (so no, bike frames aren’t made from elemental scandium – not even close). The upshot is increased strength which allows Kona’s designers to use less material (read: lighter frame) than if they were using regular old 7005 aluminum. All built up my XL test bike weighs in just under 29 lbs. with pedals – not bad for a 22″ frame with big wheels and 4-inches of travel!
The Hei Hei 2-9 frame tubes are hydroformed, a process in which the tubes are precision shaped by blasting hot metal with liquid. This allows the designers to create the beautifully sloped top-tube you see without introducing points of weakness since the metal grains remain seamlessly aligned. At points where the tubes are welded, hydroforming is used to create stronger surfaces for the connections. The 2010 Hei Hei 2-9 also sports a tapered headtube which increases strength and durability of both the frame and headset bearings.

Since 1996, Kona has been honing their 4-bar linkage suspension design and the 2010 Hei Hei 2-9 takes full advantage of this versatile rear suspension set-up. Magnesium rocker plates keep the whole assembly lightweight and extremely stiff with zero noticeable side-to-side movement. On the trail this kept the rear end laser focused on bouncy descents and quick to accelerate coming out of sharp turns.
On trails with short and fast elevation changes (think gully dips) the 4-bar linkage allows the bike to respond quickly, going from full compression back to efficient climbing in the blink of an eye. Of course much of the credit goes to the properly tuned Fox Float RP23 which comes standard on every Hei Hei 2-9 but I gotta say the match between shock and frame is impressive.
While the Hei Hei 2-9 isn’t a true all-mountain bike, it offers just the right amount of suspension to take the edge off all-day epic rides and to smooth out the rough spots on fast courses. I personally like to pedal hard and ride fast and the Hei Hei 2-9 let me do that without needing to slow down for short rock gardens or sharp, rooty patches. As a full-time hardtail rider I have to admit I noticed a bit of pedal bob on the climbs but when I remembered to engage pro-pedal most of the bounce disappeared.

The Kona Hei Hei 2-9 features fairly aggressive head and seat tube angles that are just right for XC racing, yet slack enough to enjoy the flow going downhill. As a point of reference, the Hei Hei 2-9 angles are just slightly more slack than the regular Hei Hei (26-inch wheels) but not nearly as laid back as the Kona Dawg. This turns out to be a nice compromise between climbing efficiency with sharp handling (high angles) and high speed, downhill crushing (lower angles).
Speaking of sharp handling, I was blown away by just how well the Hei Hei 2-9 handled on tight, sinuous singletrack. The wide, 710mm handlebars took some getting used to at first but I soon found the responsiveness of the bike allowed me to quickly juggle the bars through tight spaces without losing the back end. Accelerating out of tight spaces was also a treat thanks to the stiff rear end.
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