Rocky Mountain ElementvsTransition Spur
Picture yourself ripping down a fast, chattery descent, then immediately hitting a punchy technical climb. The Rocky Mountain Element Carbon 99 would reward an active rider, its Flight Attendant system swiftly firming up the suspension to rocket you uphill. In contrast, the Transition Spur Carbon XO AXS, with its slightly more trail-oriented geometry and supple Fox Factory suspension, would feel a touch more planted and forgiving as you maintain speed through the rough stuff.


Overview
Both the Rocky Mountain Element and the Transition Spur are highly capable bikes that define the modern "downcountry" segment, blending the lightweight efficiency of cross-country bikes with the aggressive geometry and descending prowess of trail bikes. Yet, they arrive at this intersection from slightly different directions, offering distinct flavors for riders who want to do it all without the heft of a full-blown trail machine. The 2025 Rocky Mountain Element, particularly the top-tier Carbon 99 build, makes a strong statement about precision and advanced integration. Its redesigned Smoothlink SL flex-pivot frame sheds a significant 350-400 grams while increasing lateral stiffness, aiming for a more race-bred, yet still versatile, feel. The inclusion of RockShox Flight Attendant on the C99 model emphasizes automated, on-the-fly efficiency, pushing its climbing capabilities to the forefront. This bike feels like a meticulously engineered tool for covering ground quickly and confidently across varied terrain. On the other hand, the Transition Spur, an established benchmark in this category since 2020, leans into its rowdy reputation with geometry that feels more like a scaled-down enduro bike. Its GiddyUp suspension, combined with a pivot-less flex-stay, provides a playful yet supportive ride that encourages an active riding style and excels at generating speed from the terrain itself. While the Spur's frame has seen fewer drastic changes, its consistent geometry and thoughtful component choices continue to resonate with riders seeking maximum fun and capability in a lightweight package. It's a bike that prioritizes visceral trail feedback and agility.
Ride and handling
The Element and Spur both boast lively characteristics, but their ride feel differs significantly in nuance. The Element, especially the C99 with Flight Attendant, feels acutely precise and automated. Reviewers consistently note its "nimble acceleration" and a "rocketship characteristic," which stems from its stiff frame and active, yet firm, suspension. "The rear end doesn't bob," Enduro MTB observed, adding that it "generates traction on technical, rough climbs." This bike rewards aggressive pedaling and quick, deliberate inputs, feeling "so stiff and light and snappy," as one Mountain Bike Action reviewer put it, comparing it to a BMX race bike. The Spur, while also quick, brings a more forgiving and playful character to the trail. Its GiddyUp suspension, with a 30% progression, is described as "oddly supple" and provides ample pop. "Every trail pop, roller, and mini double turn into a downhill pump track," The Loam Wolf exclaimed. It’s a bike that begs to be jumped and pushed into berms, shooting the rider out with surprising momentum. BikeRadar noted it's "impressively smooth on choppy terrain," ironing out bumps deftly, which makes it feel less harsh on longer descents than some stiffer competitors. For overall comfort and reducing fatigue on long rides, the Spur often gets the nod for its more relaxed, trail bike-like body position. When it comes to handling and cornering, the Element’s updated Smoothlink SL flex-stay design aims to increase lateral stiffness, leading to a "planted" feel in corners. Its Ride-4 geometry chip offers noticeable adjustments, allowing riders to sharpen handling for climbs or slacken it for descents. Singletracks found the steepest setting offered "snappier handling on the climbs, particularly in tight switchbacks." However, some riders, like Bikepacking.com's reviewer, felt a size large Element could lead to "quick, snappy steering at the expense of overall stability and confidence on steep descents." This suggests the Element's handling can be highly tuned, but may require careful sizing for ultimate descending confidence. The Spur’s "Speed Balanced Geometry" makes it a master of high-speed stability. It "feels super composed" and "stays on the deck when you want it to," according to Pinkbike, effectively "slowing down the trail." The bike prefers to be leaned into arcs rather than steered sharply, making it feel "on rails." While this creates confidence, the longer wheelbase can make it "a handful" in very tight, slow-speed switchbacks. In contrast, the Element's lower bottom bracket (47mm drop vs. Spur's 40mm) paired with its slacker head angle (65.0 degrees vs. 66.0 degrees for the selected sizes) means it will naturally track a little lower to the ground, potentially feeling more secure at speed on technical terrain, but requiring more body English to lift over obstacles.
Specifications
Examining the full range of builds reveals differing philosophies in component selection, even as both brands offer premium carbon frames. The Rocky Mountain Element, with its Carbon 99 build priced at $9,599, leans heavily into cutting-edge technology. It features RockShox Flight Attendant suspension, a wireless SRAM XX Eagle Transmission drivetrain, and top-tier SRAM Level Ultimate Stealth 4-piston brakes. This offers unmatched automated performance but comes at a steep price, with reviewers noting the inherent complexity and multiple batteries. Down the line, the C70 ($6,999) and C30 ($4,499) builds use more conventional Fox Performance Elite or Marzocchi Z2 suspension and SRAM GX Eagle Transmission or Shimano Deore drivetrains, respectively. A recurring complaint across these lower Element builds is the DT Swiss 370 rear hub's low engagement, which Mountain Bike Action described as "painfully slow," hindering power transfer. The Transition Spur, exemplified by the Carbon XO AXS build at $8,199, often garners praise for its thoughtful, trail-ready component choices. It comes with Fox Factory suspension (Float 34 FIT4 fork and Float DPS shock) and a SRAM XO Eagle Transmission drivetrain. Braking, however, is a consistent point of contention across all Spur builds. The SRAM G2 RSC brakes, even with 180mm HS2 rotors, are frequently called "underpowered" by reviewers like The Loam Wolf, with MBR reporting that earlier 160mm rear rotors would "cook and discolour" quickly. Many suggest immediate brake upgrades are necessary to match the bike's descending capabilities, representing a hidden cost. The Spur's use of a threaded bottom bracket, in contrast to the Element's press-fit BB, is a definite plus for many riders seeking easier maintenance and avoiding potential creaking. Both bikes feature carbon wheelsets on their top builds. The Element Carbon 99 rolls on DT Swiss XRC 1501 Spline 30 Carbon wheels, while the Spur Carbon XO AXS also uses DT Swiss XRC 1501 Spline 30 Carbon wheels. A notable difference is tire specification: the Element Carbon 99 comes with Maxxis Rekon 3C EXO 2.4 tires front and rear, which Enduro MTB and Bikepacking.com often found "undergunned" for aggressive trail riding. The Spur Carbon XO AXS, by contrast, uses a Maxxis Dissector 3C EXO 2.4 up front and a Rekon 3C EXO 2.4 in the rear, a more aggressive and confidence-inspiring combo that better suits its downhill intentions. Overall, while the Element's C99 offers peak technological integration, the Spur's componentry, despite the brake shortcomings, is generally seen as a more cohesive package for aggressive trail riding, often at a more accessible price point for similar carbon-level builds when Flight Attendant isn't a factor.
| Element | Spur | |
|---|---|---|
| FRAMESET | ||
| Frame | SMOOTHWALL™ Carbon | SMOOTHLINK SL™ Suspension | Full Sealed Cartridge Bearings | Press Fit BB | Internal Cable Routing | RIDE-4™ Adjustable Geometry | 120mm Travel | SMOOTHWALL™ Carbon Rear Triangle | Spur Carbon 120mm (UDH) |
| Fork | Marzocchi Z2 Float EVOL Rail 130mm | 44mm Offset | Fox Float 34 Rhythm (120mm) |
| Rear shock | Fox Float Performance | Sealed Bearing Eyelet | 20x8mm F Hardware | All Sizes = 190x45mm | Size-Specific tune in FAQ | Fox DPS Performance (190x45mm) |
| GROUPSET | ||
| Shift levers | Shimano XT | Shimano Deore M6100 i-Spec EV |
| Front derailleur | — | |
| Rear derailleur | Shimano XT | Shimano Deore M6100 SGS 12-speed |
| Cassette | Shimano Deore 10-51T 12spd | Shimano Deore M6100 (10-51T) |
| Chain | Shimano M6100 | Shimano Deore M6100 |
| Crankset | Shimano Deore | 32T | 24mm Spindle | Crankarm Length: XS - SM = 165mm | MD - XL = 170mm | Shimano Deore M6100 (30T/170mm) |
| Bottom bracket | Shimano SM-BBMT500 | Shimano Deore M6100 compatible bottom bracket (not listed) |
| Front brake | Shimano MT4120 4 Piston | Resin Pads | Shimano Deore M6120 4-piston hydraulic disc |
| Rear brake | Shimano MT4120 4 Piston | Resin Pads | Shimano Deore M6120 4-piston hydraulic disc |
| WHEELSET | ||
| Front wheel | WTB KOM Team i27 TCS 2.0 | 28H | Tubeless Set Up | Sealant Incl; Shimano TC500 | 15mm Boost; 2.0 Stainless | WTB ST i27; Novatech D791SB; Pillar Double Butted |
| Rear wheel | WTB KOM Team i27 TCS 2.0 | 28H | Tubeless Set Up | Sealant Incl; Shimano TC500 Boost 148mm; 2.0 Stainless | WTB ST i27; Novatech D902SB; Pillar Double Butted |
| Front tire | Maxxis Rekon 2.4 WT EXO Tubeless Ready | Maxxis Rekon 2.4 WT EXO Tubeless Ready | Tubeless Set Up | Sealant Incl | Maxxis Dissector EXO (2.4) |
| Rear tire | Maxxis Rekon 2.4 WT EXO Tubeless Ready | Maxxis Rekon 2.4 WT EXO Tubeless Ready | Tubeless Set Up | Sealant Incl | Maxxis Rekon EXO (2.4) |
| COCKPIT | ||
| Stem | Rocky Mountain 31.8 XC | 5° Rise | All Sizes = 50mm | RaceFace Aeffect R (40mm) |
| Handlebars | Rocky Mountain AM | 760mm Width | 25mm Rise | 9° Backsweep | 5° Upsweep | 31.8 Clamp | RaceFace Aeffect R (780mm width, 20mm rise) — SM/MD/LG/XL |
| Saddle | WTB Silverado Race 142 | Steel Rails | SDG Bel Air 3 |
| Seatpost | X Fusion Manic Composite 30.9mm | XS - SM = 125mm | MD = 150mm | LG = 170mm | XL = 200mm | OneUp Dropper Post — SM: 150mm, MD: 180mm, LG: 210mm, XL: 240mm |
| Grips/Tape | Rocky Mountain Lock On Light | ODI Elite Flow Lock-On |
Geometry and fit comparison
Comparing the Rocky Mountain Element (size MD) to the Transition Spur (size LG), we see a clear divergence in fit and handling philosophy, even within the downcountry category. The Element MD, with its 450mm reach and 593mm top tube, feels significantly shorter and more compact than the Spur LG, which boasts a generous 480mm reach and 630mm top tube. This 30mm difference in reach means the Spur provides a much more stretched-out and stable cockpit, better suited for aggressive descending stances, whereas the Element offers a more upright and traditional XC-oriented fit, as noted by its 420mm seat tube length compared to the Spur’s 460mm. In terms of handling geometry, the Element favors a slightly slacker head tube angle and lower bottom bracket. Its 65.0-degree head tube angle is a full degree slacker than the Spur's 66.0 degrees, contributing to more composed steering on steep terrain. The Element also sits lower, with a 47mm BB drop compared to the Spur's 40mm, which enhances stability by lowering the rider's center of gravity. This combination makes the Element feel more "planted" at speed. Conversely, the Spur's steeper head angle, combined with a slightly higher stack (619mm vs. Element's 622mm for the compared sizes), aims for a quicker, more responsive steering feel in tight situations, although its long wheelbase (1219mm vs. Element's 1208mm) still prioritizes stability on faster trails. Seated climbing positions also vary. The Element's steeper 76.5-degree seat tube angle (compared to the Spur's 75.9 degrees) puts the rider more directly over the pedals, improving power transfer and reducing front-end wander on steep ascents. Reviewers appreciated this for efficient climbing. However, the Spur's more relaxed 75.9-degree seat angle, though comfortable, can feel a bit more rearward, as noted by Vital MTB, requiring riders to slide forward on the saddle for optimal power on steep grades. The Spur does offer a remarkably low standover height at 670mm (versus the Element's 810mm), which gives riders more room to maneuver their bodies and inspires confidence on technical descents. This difference in standover is substantial and caters to riders who prioritize a deep, unhindered body position on rowdy terrain. Ultimately, the Element's geometry caters to riders who appreciate a more traditional XC fit with a modern, slack front end for balanced trail performance, especially in its slacker Ride-4 settings. It suits those who prioritize efficient climbing and precise handling for a mix of technical and flowy trails. The Spur, on the other hand, is for riders who prefer a longer, more aggressive trail bike feel that's been lightened for efficiency. Its extended reach and low standover are ideal for active riders who spend more time standing and descending at speed, rewarding a dynamic riding style with significant stability and confidence. For taller riders or those who typically ride larger enduro bikes, the Spur's geometry might feel more familiar and confidence-inspiring for aggressive riding.
| FIT GEO | Element | Spur | |
|---|---|---|---|
| Stack | 631 | 619 | -12 |
| Reach | 475 | 480 | +5 |
| Top tube | 618 | 630 | +12 |
| Headtube length | 120 | 120 | 0 |
| Standover height | 807 | 670 | -137 |
| Seat tube length | 445 | 460 | +15 |
| HANDLING | Element | Spur | |
|---|---|---|---|
| Headtube angle | 65 | 66 | +1 |
| Seat tube angle | 76.5 | 75.9 | -0.6 |
| BB height | — | 335 | — |
| BB drop | 47 | 40 | -7 |
| Trail | — | — | — |
| Offset | — | 44 | — |
| Front center | — | — | — |
| Wheelbase | 1237 | 1219 | -18 |
| Chainstay length | 436 | 435 | -1 |
Who each one is for
Rocky Mountain Element
The Rocky Mountain Element Carbon 99 is ideal for the rider who values peak efficiency and refined integration on every ride. This is the bike for the technically-minded cross-country enthusiast or marathon racer who wants to conquer long, demanding climbs with minimal fuss, then descend with surprising confidence. If you spend your weekends tackling multi-stage races or epic backcountry rides where every gram and every pedal stroke counts, and you appreciate the seamless, automated performance of Flight Attendant adjusting your suspension on the fly, this bike is built for you. It's for the rider who wants a lightweight, stiff platform that delivers a precise, laser-focused feel across diverse terrain, from fast singletrack to technical descents, without compromising climbing prowess.
Transition Spur
The Transition Spur Carbon XO AXS speaks to the rider who comes from a trail or enduro background but craves a lighter, more energetic bike for everyday adventures. This is for the "knee-pad-wearing XC rider" who enjoys climbing but truly lives for the descents, seeking a playful, poppy ride that encourages jumps and creative line choices. If you frequent flow trails, pump tracks, or blue-to-black diamond singletrack where you can generate speed by pumping and jibbing, the Spur's stable, yet agile, handling will put a permanent grin on your face. It's also a strong contender for those long, fun days in the hills where comfort and capability over varied terrain are prized, even if it means occasional brake fade on the longest, steepest descents.

