Riding the 2015 Giant Reign: Are Modern Mountain Bikes Really Improving?

I recently tested a 2015 Giant Reign to see how it stacks up against the 2019 long-travel 27.5" mountain bikes I have ridden, and was surprised to enjoy most of what the bike has to offer.

When I made the swap from cross-country to gravity riding, 27.5″ bikes were slowly climbing toward the popularity pedestal that 26″ whips long sat atop. Having raced 29er hardtails for years, I had a pile of wagon-sized rims and tires, so It made sense to buy a long-travel 29er. The Niner RIP 9 I picked up had less travel than “down-country” bikes do today, but at the time it was considered a legit gravity sled.

Having leapt directly over the midsize wheel whips, with all of their travel and nimble handling promises, I have recently been wanting to ride one of the 27.5″ bikes that my friends were raving about at the height of that first “so enduro” wave. I wanted to know how all of that hype and popularity stacks up against the refined 27.5″ and 29″ party bikes that I regularly get to test today.

A few weeks back I flew to Omis, Croatia to race an enduro, and borrowed a medium 2015 Giant Reign from local racer, Kresimir Vuković. I would have a full day to dial in the suspension, followed by a full day of racing, and a final ride in the backcountry to answer any lingering questions about the bike. While this Reign is several steps into the timeline of 27.5″ enduro bikes, it seemed like a fair point in history to compare with what’s available today.

Vuković’s Reign has received some important component improvements since he purchased the bike nearly five years ago. The most notable upgrade is a set of Shimano Saint brakes he swapped in to give the bike proper stopping power. For my personal riding preferences, there are no better brakes. He’s also swapped tires numerous times. Like most of the riders I met in Croatia, Vuković has a set of Magic Mary tires mounted front and rear. The dirt around Omis is correctly characterized as “anti-grip” and it takes a load of soft rubber to keep the bike on track.

The RockShox fork and shock on this Reign have both been swapped out for aftermarket squish, and this is where my comparison begins in earnest. With one volume spacer in the shock, it was easy enough to tune in a proper amount of support throughout the stroke. This older version of Giant’s Maestro suspension isn’t quite as lively as some newer 27.5″ bikes I have ridden, but overall it stacks up quite well against the latest breed of bikes.

The frame’s shorter reach measurement (444mm) made balancing my weight up over the front tire feel fairly natural, which is necessary on slicker tracks. Finding a comfortable traction balance with the limousine reach on some new bikes, coupled with their oft short chainstays, can feel less instinctive than it does on this 2015 Reign. Unfortunately, the DVO Diamond fork on this bike is a poor match for its overall geometry. I fiddled with the fork multiple times on almost every descent, watched setup videos, and read reviews from folks who had some success with it, all to no avail. No matter how much compression I added the fork swallowed the first half of its travel with little input, preventing a forward stance on the bike.

For my riding style, and Croatia’s loose terrain, this fork felt about as unsupportive as they come. The bike has a 65° headtube angle, and the trails we raced on were rarely steep, so it seems the issue here was the fork itself. I ended up inflating the air chamber far beyond the recommended pressure for my weight to give it as much composure as possible on the rougher sections of track, which resulted in inferior front tire grip, regardless of the compression and rebound settings. Ultimately, I released a little pressure and opted to ride further aft on the bike to make up for the fork’s deep diving tendencies, and that sort of worked.

The 2015 Reign’s geometry is fairly similar to a new 27.5″ enduro bike you might buy today, save one element: the seat tube angle. At 73° the seat tube is 2.3° slacker than the angle of a 2019 Santa Cruz Bronson, with otherwise similar geo and travel. This leaned back posture clearly affects the bike’s climbing prowess, with a large portion of rider weight hanging back over the rear tire, resulting in undesirable pedal-bob and a need to place your nose nearby the stem to keep the front tire tracking. With the saddle slid as far forward as its rails will allow this issue was largely solved, but it does point to the benefits of modern seat tubes growing steeper.

After pedaling the Reign on some wicked fun trails for three days, I learned a few things about these bikes that my friends have been whipping around while I plowed through aboard various 29ers. Most importantly, they are still really good bikes, even when compared to new frames that have seen 5 seasons of rethinking and redrawing. If I had purchased this 2015 alloy Reign today, I would be happy to ride it — after sending the fork in for a retune. It’s playful enough to party, and the shorter reach allowed me to throw it around with less effort than my personal long-travel bike. It wouldn’t be my go-to frame for racing, as it does have a harsher ping-pong effect when you take the rough line at full throttle, but for daily riding it is a solid whip.

Compared to the 2019/2020 bikes with 27.5″ wheels that I have ridden, this particular Reign feels noticeably less composed. Over the past five years, suspension and frame designers have learned how to keep the playful temperament of 27.5″ bikes alive, while improving their overall stability and composure characteristics at race speed.

My final note on this graciously loaned gravity-tool is that the seat tube length and shape limited the amount of dropper travel significantly. The 120mm post in this frame felt problematically shorter than the 150mm post in my daily driver, slapping my glutes awkwardly at several points during the race. Most modern frame designers are working to shorten seat tubes as much as possible while making room for maximum post insertion, so even shorter riders can get as low as we like.

Thanks for letting me test out your Reign, Kresimir!

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