Specialized Stumpjumper ST 29" Mountain Bike 2020 - Trail Full Suspension MTB

The Specialized Stumpjumper ST models are snappy and nimble, yet Incredibly versatile—the perfect rigs for riders seeking both efficiency and capability. The Stumpjumper ST Alloy 27.5 makes that winning combo affordable, with components that are big on performance and small on dollar signs.
Key Features:
- M5 aluminium alloy frame with dialled trail geometry
- RockShox Recon RL fork offers 130mm of controlled suspension travel
- X-Fusion O2 shock controls the 130mm of rear wheel travel
- SRAM SX Eagle 1x12 speed drivetrain for a very wide gear range
- Tektro Gemini Comp disc brakes for all weather stopping power
- Sizes: Small, Medium, Large, X Large
- Colours: Satin Gloss Black / Black
- The Specialized Stumpjumper ST Alloy 29 is available with 0% APR finance
The Ultimate Trail Bike:
The innovative sidearm frame design makes a lighter, better-handling bike. By directly connecting all three mounting points of the rear-end and shock to the frame, they've increased both stiffness and performance over bumps. End result? Total control.
Perfectly-Balanced Suspension:
Our in-house suspension-tuning team develops custom shock tunes, perfectly paired to each bike's kinematics. Specialized call this Rx Tune and while it's not the easy way to build a suspension bike, it's worth it. You feel Rx Tune as perfectly-balanced suspension.
Highlights:
- 29er wheels roll over obstacles and maintain your momentum with ease.
- 130-millimeters of suspension courtesy of a RockShox Recon RL fork.
- SX Eagle 12-speed drivetrain gives you single-ring simplicity and gearing to spare.
- The M5 alloy frame, asymmetrical “sidearm” design, and our 29er Geometry, make this Stumpjumper both capable and efficient.
- 130-millimeters of plush and controlled suspension (including a lock-out) come courtesy of a RockShox Recon RL fork.
- SX Eagle 12-speed drivetrain gives you single-ring simplicity and all the gearing you need to summit the biggest climbs.
- 29er wheels roll over obstacles and maintain your momentum with ease.
- The TranzX seatpost lets you drop your saddle on descents, increasing your maneuverability and control when the trail gets dicey.
All Tredz bikes are:
- Fully built & ready to ride
- Fully checked & tested by Cytech qualified mechanics
- Available with 0% APR finance on any basket over £99
- UK price match guarantee
- 365 day no hassle returns
- Free delivery in the UK Mainland on a date that suits you
In the box with every Tredz bike is:
- Free Tredz 9 key trail tool
- Free Tredz pedal spanner
- Free basic pedals
- Tredz drawstring kit bag
- 16 point quality control check sheet
- Basic bike setup instructions
- Free Cycle Plan insurance voucher (8 weeks)
Occasionally, without notice, manufacturers change product design and/or specifications.
Specialized Stumpjumper Sizing and Geometry
|
XS |
S |
M |
L |
XL |
Rider Height (Inch) |
4’10” – 5’1” |
5’2” – 5’5” |
5’5” – 5’10” |
5’10” – 6’1” |
6’1” – 6’4” |
Rider Height (cm) |
148 - 155 |
158 - 165 |
165 - 178 |
178 - 185 |
185 - 193 |
Stumpjumper 27.5 Geometry
|
S |
M |
L |
XL |
CRANK LENGTH |
170 |
170 |
170 |
17M |
STEM LENGTH |
40 |
40 |
50 |
50 |
SEATPOST LENGTH |
375 |
438 |
438 |
478 |
SADDLE WIDTH |
155mm |
143mm |
143mm |
143mm |
HANDLEBAR WIDTH |
780mm |
780mm |
780mm |
780mm |
REACH |
405mm |
425mm |
445mm |
470mm |
TOP TUBE LENGTH, HORIZONTAL |
572mm |
595mm |
628mm |
662mm |
STACK |
614mm |
614mm |
641mm |
656mm |
WHEELBASE |
1149mm |
1169mm |
1201mm |
1232mm |
CHAINSTAY LENGTH |
437mm |
437mm |
437mm |
437mm |
FRONT CENTER |
714mm |
734mm |
766mm |
797mm |
BB DROP |
33mm |
33mm |
33mm |
33mm |
BB HEIGHT |
342mm |
342mm |
342mm |
342mm |
SEAT TUBE ANGLE |
74.8° |
74.5° |
74.1° |
73.7° |
HEAD TUBE ANGLE |
66.5° |
66.5° |
66.5° |
66.5° |
SEAT TUBE LENGTH |
380mm |
410mm |
455mm |
505mm |
HEAD TUBE LENGTH |
95mm |
95mm |
125mm |
140mm |
BIKE STANDOVER HEIGHT |
747mm |
750mm |
762mm |
775mm |
FORK RAKE/OFFSET |
51mm |
51mm |
51mm |
51mm |
FORK LENGTH, FULL |
560mm |
560mm |
560mm |
560mm |
TRAIL |
107mm |
107mm |
107mm |
107mm |
Stumpjumper 29" Geometry
XS | S | M | L | XL | |
---|---|---|---|---|---|
CRANK LENGTH | 170 | 170 | 170 | 170 | 170 |
STEM LENGTH | 40 | 40 | 40 | 50 | 50 |
SEATPOST LENGTH | 325 | 375 | 438 | 438 | 478 |
SADDLE WIDTH | 155mm | 143mm | 143mm | 143mm | 143mm |
HANDLEBAR WIDTH | 780mm | 780mm | 780mm | 780mm | 780mm |
REACH | 405mm | 415mm | 435mm | 455mm | 480mm |
TOP TUBE LENGTH, HORIZONTAL | 544mm | 570mm | 595mm | 627mm | 660mm |
STACK | 581mm | 592mm | 596mm | 623mm | 637mm |
WHEELBASE | 1127mm | 1157mm | 1179mm | 1212mm | 1243mm |
CHAINSTAY LENGTH | 432mm | 432mm | 432mm | 432mm | 432mm |
FRONT CENTER | 696mm | 726mm | 748mm | 780mm | 812mm |
BB DROP | 28mm | 21mm | 21mm | 21mm | 21mm |
BB HEIGHT | 325mm | 336mm | 336mm | 336mm | 336mm |
SEAT TUBE ANGLE | 76.5° | 75.3° | 75° | 74.6° | 74.2° |
HEAD TUBE ANGLE | 66.5° | 65.5° | 65.5° | 65.5° | 65.5° |
SEAT TUBE LENGTH | 380mm | 380mm | 410mm | 455mm | 505mm |
HEAD TUBE LENGTH | 100mm | 105mm | 110mm | 140mm | 155mm |
BIKE STANDOVER HEIGHT | 742mm | 739mm | 743mm | 758mm | 774mm |
FORK RAKE/OFFSET | 46mm | 46mm | 46mm | 46mm | 46mm |
FORK LENGTH, FULL | 522mm | 542mm | 542mm | 542mm | 542mm |
TRAIL | 103mm | 112mm | 112mm | 112mm | 112mm |
Stumpjumper ST 27.5 Geometry
XS | S | M | L | XL | |
---|---|---|---|---|---|
CRANK LENGTH | 170 | 170 | 170 | 170 | 170 |
STEM LENGTH | 50 | 50 | 50 | 50 | 50 |
SEATPOST LENGTH | 356 | 406 | 456 | 456 | 456 |
SADDLE WIDTH | 155mm | 143mm | 143mm | 143mm | 143mm |
HANDLEBAR WIDTH | 780mm | 780mm | 780mm | 780mm | 780mm |
REACH | 405mm | 415mm | 435mm | 455mm | 480mm |
TOP TUBE LENGTH, HORIZONTAL | 544mm | 570mm | 595mm | 627mm | 660mm |
STACK | 581mm | 592mm | 596mm | 623mm | 637mm |
WHEELBASE | 1127mm | 1157mm | 1179mm | 1212mm | 1243mm |
CHAINSTAY LENGTH | 432mm | 432mm | 432mm | 432mm | 432mm |
FRONT CENTER | 696mm | 726mm | 748mm | 780mm | 812mm |
BB DROP | 28mm | 21mm | 21mm | 21mm | 21mm |
BB HEIGHT | 325mm | 336mm | 336mm | 336mm | 336mm |
SEAT TUBE ANGLE | 76.5° | 75.3° | 75° | 74.6° | 74.2° |
HEAD TUBE ANGLE | 66.5° | 65.5° | 65.5° | 65.5° | 65.5° |
SEAT TUBE LENGTH | 380mm | 380mm | 410mm | 455mm | 505mm |
HEAD TUBE LENGTH | 100mm | 105mm | 110mm | 140mm | 155mm |
BIKE STANDOVER HEIGHT | 742mm | 752mm | 757mm | 769mm | 770mm |
FORK RAKE/OFFSET | 46mm | 46mm | 46mm | 46mm | 46mm |
FORK LENGTH, FULL | 522mm | 542mm | 542mm | 542mm | 542mm |
TRAIL | 103mm | 112mm | 112mm | 112mm | 112mm |
Stumpjumper ST 29" Geometry
S | M | L | XL | |
---|---|---|---|---|
CRANK LENGTH | 170 | 170 | 170 | 170 |
STEM LENGTH | 50 | 50 | 50 | 50 |
SEATPOST LENGTH | 406 | 456 | 456 | 456 |
SADDLE WIDTH | 155mm | 143mm | 143mm | 143mm |
HANDLEBAR WIDTH | 780mm | 780mm | 780mm | 780mm |
REACH | 405mm | 425mm | 445mm | 470mm |
TOP TUBE LENGTH, HORIZONTAL | 573mm | 597mm | 628mm | 662mm |
STACK | 619mm | 619mm | 642mm | 656mm |
WHEELBASE | 1151mm | 1171mm | 1201mm | 1232mm |
CHAINSTAY LENGTH | 437mm | 437mm | 437mm | 437mm |
FRONT CENTER | 716mm | 736mm | 766mm | 797mm |
BB DROP | 33mm | 33mm | 33mm | 33mm |
BB HEIGHT | 341mm | 341mm | 341mm | 341mm |
SEAT TUBE ANGLE | 74.8° | 74.5° | 74.1° | 73.7° |
HEAD TUBE ANGLE | 66.5° | 66.5° | 66.5° | 66.5° |
SEAT TUBE LENGTH | 380mm | 410mm | 455mm | 505mm |
HEAD TUBE LENGTH | 100mm | 100mm | 125mm | 140mm |
BIKE STANDOVER HEIGHT | 756mm | 762mm | 775mm | 776mm |
FORK RAKE/OFFSET | 51mm | 51mm | 51mm | 51mm |
FORK LENGTH, FULL | 560mm | 560mm | 560mm | 560mm |
TRAIL | 107mm | 107mm | 107mm | 107mm |
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