Rocky Mountain AltitudevsTransition Spire

Rocky Mountain's latest Altitude is a ground-up redesign, shedding its previous iteration's all-mountain leanings to become a dedicated gravity-fed weapon. It features a new LC2R dual-link suspension system, marking a significant departure from Rocky Mountain's long-standing Horst link, and focuses heavily on high-speed stability and bump-eating prowess. This is a bike explicitly built for racing the clock or charging down the gnarliest lines imaginable. The Spire, on the other hand, arrived on the scene with unapologetically long, slack geometry and 170mm of travel, yet it's widely praised for a ride quality that feels more nimble and fun than its numbers suggest. It aims to be a "nimble bruiser" that excels in bike parks and on rough trails, while still being a surprisingly efficient pedaler for big days out. Both bikes are clearly for aggressive riding, but the Altitude's evolution pushes it towards unadulterated race performance, while the Spire holds onto a touch more all-around playfulness within its burly segment.

The Altitude, with its new LC2R suspension, delivers a ride quality often described as a "magic eraser." It irons out square edges and absorbs impacts with remarkable composure, giving riders a deeply planted feel that builds confidence on steep and choppy terrain. Reviewers consistently note the suspension's ability to "make terrain almost completely disappear," allowing for aggressive lines where other bikes might get bucked. This plush, yet efficient, character makes it a "full-blast, straight-line monster" that excels when ridden at speed. However, this unwavering stability comes with a trade-off; some found it less playful than its predecessor, requiring more effort to make it lively on flatter trails. The rear end is especially lauded for its bump-eating capabilities, with coil shock options often highlighted for making it feel "deeper, plusher, and gooier." That said, some riders found the stock air shock tune a bit light for really aggressive riding, suggesting a firmer setup might be necessary for the hardest chargers. In contrast, the Spire is lauded for combining its burly 170mm travel with a lively, engaging feel. Its GiddyUp suspension, while offering excellent small-bump compliance and traction, is also designed for pop and responsiveness, making it eager to get airborne or pump through terrain. Reviewers frequently describe it as riding like a smaller bike than its numbers imply, praising its ability to feel "agile and fun" despite the long wheelbase. This makes it a great choice for riders who want downhill capability but still enjoy an active, dynamic ride. While exceptionally stable at speed, the Spire does transmit more feedback through the frame on repetitive, square-edged hits, particularly in alloy builds. This isn't necessarily harsh, but it's a direct feel that demands rider input rather than simply plowing through everything. Climbing performance on both bikes is surprisingly competent given their gravity intentions. The Altitude, despite its weight, claws its way uphill with immense traction, offering an "endless amount of traction" on loose or technical ascents. Its steep seat tube angle puts the rider in a comfortable, centered pedaling position for long grinds. While some pedal bob is noticeable, especially with coil shocks, the bike is generally efficient enough to get to the top without too much fuss. The Spire also impresses on the climbs, often described as more efficient than expected. Its steep effective seat tube angle places the rider directly over the bottom bracket, making for a neutral and powerful seated climbing position. Reviewers found it surprisingly capable on technical uphills, noting its ability to maintain traction over slippery roots and rocks. However, the Spire's sheer length can make navigating tight switchbacks more challenging than on some other enduro bikes.