Stumpjumper Alloy FAQ

Table of Contents
An Introduction to the Stumpjumper Alloy
Some key features and specifications of the 2012 Stumpjumper Alloy:
Frame
- Material: M5 Alloy (high-quality aluminum alloy)
- Design: Hydroformed tubing for optimal strength-to-weight ratio
- Geometry: Aggressive trail geometry for stability and control on technical terrain
- Suspension:
- Front: Typically equipped with a RockShox or Fox suspension fork with around 120mm to 140mm of travel, depending on the specific model variant.
- Rear: Some versions may include Specialized’s FSR (Future Shock Rear) suspension design, but the base alloy model might be a hardtail (no rear suspension).
- My bike came with the Fox Float 32 RL fork with 140mm of travel in the front, and a Fox Float shock with 140mm of travel in the rear. This was a Specialized designed Fox made “Brain” suspension that simulated a hard tail during steep climbs. This worked well for me and almost comparable to my hard tail Trek 4300.
- Drivetrain:
- Typically comes with Shimano or SRAM components.
- 2×10 or 3×10 gear setups were common, offering a wide range of gears for climbing and descending.
- Mine came with a 2×10 drivetrain, featuring a Shimano XT rear derailleur and shifters, and a SRAM S-1250 double crankset. This setup provides a wide range of gearing options for climbing and descending.
- Brakes: My stumpjumper was equipped with the Avid Exilir Hydraulic disc brakes for reliable stopping power in various conditions.
- Wheels: 26-inch wheels were standard, though some models may have had options for 29-inch wheels (29er) depending on the sub-model and market trends at the time.
- Tires: Specialized or another reputable brand, designed for all-mountain or trail riding.
Other Features
- Dropper Post: Some higher-end variants might include a dropper seatpost for on-the-fly saddle height adjustment.
- Cockpit: Specialized components for the handlebar, stem, and saddle, designed for durability and comfort.
Use Case
- Trail Riding: The Stumpjumper Alloy is designed for aggressive trail riding, capable of handling technical descents and challenging climbs.
- Versatility: Suitable for a variety of off-road terrains, making it a versatile choice for both recreational riders and more serious mountain biking enthusiasts.
Model Variants
Specialized typically offers several variants within the Stumpjumper series, with differences in component spec, suspension travel, and other features to cater to different riding styles and budgets.
Overall, the 2012 Specialized Stumpjumper Alloy is known for its robust construction, reliable performance, and versatility, making it a solid choice for mountain bikers looking for a dependable trail bike. If you need specific details about a particular sub-model or variant, such as the Stumpjumper FSR Comp Alloy or others, please let me know!





How Well Do the Stumpjumper's Brakes Work on the Mountain Trails?
My Stumpjumper came with Avid Elixir hydraulic brakes. With single pistons on both the front and rear calipers, these brakes provided ample stopping power especially when controlling you speed and “emergency” braking on steep descents. The modulation was (is) great and provided a good feedback throughout the brake application.
Is the Stumpjumper Alloy Suitable for Beginniner Mountain Bikers?
Yes, the Stumpjumper is suitable for beginner mountain bikers. With smooth shifting, cushioning suspension and reliable brakes, this is a very forgiving and enjoyable bike to make beginners into long time riders. For fist timers looking for a full-suspension bike, this provides a gradual transition as they can make the rear suspension as rigid as they want to simulate a hard-tail, and
Your Best Trail Partner
I hope you found this information helpful. Check out my other related posts such as Interval Training Tips for Cyclists, The Best Leg Exercises for Cyclists and Disc Brake Problems and How to Fix them. We also recorded a relevant podcast on injuries and prevention.