{"id":2230285,"date":"2026-10-31T10:40:00","date_gmt":"2026-10-31T07:40:00","guid":{"rendered":"https:\/\/analyse.optim.biz\/?p=2230285"},"modified":"2026-10-31T10:40:00","modified_gmt":"2026-10-31T07:40:00","slug":"specialized-stumpjumper-vs-trek-fuel-ex-long-travel-trail-bikes-round-1","status":"publish","type":"post","link":"https:\/\/analyse.optim.biz\/?p=2230285","title":{"rendered":"Specialized Stumpjumper vs. Trek Fuel EX: Long-travel trail bikes, round 1"},"content":{"rendered":"
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The Specialized Stumpjumper and Trek Fuel EX<\/a> have a lot in common. Both offer 145mm of rear travel, in-frame storage, mixed-wheel compatibility, and extensive adjustability in the frame and geometry. From two of the world\u2019s largest mountain bike manufacturers, both platforms offer plenty of build options, with either RockShox or Fox suspension packages and SRAM or Shimano groupsets. For $6,200, you can choose either the Stumpy 15 EVO Expert or the Fuel EX 9.8 \u2014 they cost the same.<\/p>\n

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<\/td>\nSpecialized Stumpjumper 15 EVO Expert<\/strong><\/td>\nTrek Fuel EX 9.8 Eagle 90<\/strong><\/td>\n<\/tr>\n
Suspension travel (F\/R)<\/td>\n160\/145mm<\/td>\n150\/145mm<\/td>\n<\/tr>\n
Drivetrain<\/td>\nSRAM GX AXS<\/td>\nSRAM Eagle 90<\/td>\n<\/tr>\n
Suspension<\/td>\nFox 36 Performance Elite Grip X2, Fox Float X Genie<\/td>\nRockShox Lyrik Ultimate, RockShox Super Deluxe Ultimate<\/td>\n<\/tr>\n
Geometry*(size large frame)<\/td>\nHTA: 64\u00b0
STA: 76\u00b0
Reach: 470mm
Chainstay: 435mm<\/td>\n		HTA: 64.5\u00b0
STA: 77.4\u00b0
Reach: 485mm
Chainstay: 442mm<\/td>\n<\/tr>\n
Weight<\/td>\n32.2lb (S4)<\/td>\n<\/td>\n<\/tr>\n
Price<\/td>\n$6,199<\/td>\n$6,199<\/td>\n<\/tr>\n<\/tbody>\n<\/table>
*Size large or S4 (Specialized)
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Travel and category positioning<\/h2>\n

While our bracket may just say \u201cSpecialized Stumpjumper,\u201d I want to make it clear we mean the Stumpjumper 15 EVO<\/a>. What is the difference? The EVO iteration has a 160mm fork for an even more capable bike. While Specialized still offers the Stumpjumper 15 with 150mm of fork travel, in 2026 they decided to move forward with the EVO version only. That said, the Stumpy 15 EVO could easily become a Stumpy 15 again with a shorter 150mm fork.\u00a0<\/p>\n

Specialized says that the Stumpjumper 15 EVO can \u201cdevour bumps like a big bike,\u201d while maintaining \u201cshort-travel control, playfulness, and efficiency.\u201d That said, many of Specialized\u2019s adjectives for the bike favor its descending capabilities. Jeff felt the same about the Stumpjumper 15<\/a>, which he said was the best bike he\u2019s ever tested.<\/p>\n

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\u201cBut if I had to give the bike an edge between tech and flow trails, I might give it a slight edge for the rougher stuff based on how well the suspension handles abrupt transitions and how quickly it recovers and sets up for the next object in its path.\u201d<\/p>\n

Trek also claims the Fuel EX can \u201ctackle any trail, anytime.\u201d That is certainly true, especially considering it can be so many different bikes. However, in my recent time on the Fuel EX<\/a>, I found that version of the modular bike much sportier on the trail and more efficient to pedal. While I have always liked the capability of Trek\u2019s Active Pivot Braking (APB), it isn\u2019t a monster truck over chunky trails.<\/p>\n

As I wrote in my review, \u201cthe Fuel EX encourages good line choice rather than point-and-plow-style riding, since its 145mm travel limit is relatively easy to find.\u200b\u201d<\/p>\n

Geometry: Could the Stumpjumper be a tough fit?<\/h2>\n

Specialized offers a massive size range for the Stumpjumper 15 EVO \u2014 six sizes, to be exact. The brand ditched \u201ct-shirt\u201d sizing a while ago, opting for a number system: S1-S6. The reach span is huge, from 400mm on an S1 to 525mm on an S6. Surely, for the short and tall among us, the Stumpy is a good option.\u00a0<\/p>\n

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But it is in the middle where the geo can veer from what we might deem \u201cnormal.\u201d While many long-travel trail bikes have a roughly 480mm reach in size L (the Trek Fuel EX is 485mm), the S4 Stumpjumper EVO 15 is 470mm. If that is too short, bumping up a size takes you to 495mm \u2014 likely too long if you\u2019re used to that \u201cnormal\u201d 480mm number.<\/p>\n

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Aside from that, the Stumpjumper 15 EVO has geometry expected for a bike in this category, with numbers somewhat similar to the Fuel EX. The Stumpjumper has a 64\u00b0 head tube angle, while the Fuel EX is 64.5\u00b0. For seat tube, the Stumpy and Fuel are within 2\u00b0 of each other, 76\u00b0 and 77.4\u00b0, respectively.\u00a0<\/p>\n

The chainstays are nearly spot on \u2014 well, if you flip the Stumpjumper\u2019s flip-chip, that is. Swapping the chip on the Stumpjumper\u2019s stays adjusts bottom bracket height but also extends the back end by 6mm, taking the shorter 435mm chainstays up to 441mm and within 1 mm of the Fuel\u2019s.<\/p>\n

The Stumpjumper also has a 6mm taller stack than the Fuel EX, with the Stumpjumper sitting at 644mm and the Fuel at 638mm. However, switching the Fuel to MX mode and matching the fork travel increases the stack to 641mm. The Fuel platform is modular, and these changes significantly affect the geometry. For example, the swap from EX to LX changes the reach by 12mm.<\/p>\n

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Builds that are close and many options<\/h2>\n

Again, the Stumpjumper 15 EVO Expert and the Fuel EX 9.8 Eagle 90 are $6,199. But these aren\u2019t the only options at (or near) this price.\u00a0<\/p>\n

Both of these frames are carbon, and both brands offer aluminum builds of these bikes. Trek\u2019s lower-spec, lower-priced bikes use aluminum frames. The same is mostly true for Specialized, but some aluminum builds have better components than their carbon fiber counterparts.<\/p>\n

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They also have RockShox and Fox options, as well as SRAM and Shimano. In this matchup, Fox Performance Elite-level suspension goes up against RockShox Ultimate-level. While the Stumpjumper mixes Fox suspension with SRAM Maven brakes, Trek pairs RockShox suspension with Mavens.<\/p>\n

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