Stomper FS Ace

The Stomper FS takes the tech and features from our adult full suspension line and packages it into a proper youth-focused bike for young riders looking to unlock some extended play out on the trail.

  • SR Suntour XCM fork
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Shipping Policy

Free shipping on all orders for bikes, apparel, parts & accessories for any order in the United States. 

*Please allow for 5-7 days of transit time as all orders are shipped via ground shipping.

*If an order is placed on Friday, please allow 2-3 days for processing. 

Please reach out to if you have any questions.

Return Policy

Returns are accepted within 30 days of delivery.


  • The bike or part must be in its original packaging to receive a 100% refund.
  •  If product is unused but protective packaging has been removed or has major damage, we will refund 75% of the order.
  • We do not accept returns on apparel.
  • Please allow for 7-10 days to process the return and issue refund.

*Protective packaging includes: foam, cardboard, zip ties, plastic axle covers, warning decals and reflectors.

Please reach out to to start a return.

This bike will come partially assembled. We offer a free bike build program via GT Connect on every mountain or gravel bike purchased over $1000.

Want to build on your own? Please refer to these instructions and build video on how to assemble the bike.

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UDH Equipped

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frame Stomper FS 26* Frame, 120mm Travel, BSA 73mm, Tapered Head Tube, Boost 12×148mm Thru-Axle, SRAM UDH, 190×42.5mm Shock Mount
sizes available One Size
fork SR Suntour XCR34 Air, 130mm, 15x110mm
rear shock SR Suntour Raidon R, 190x142.5mm
wheel size 26


rims WTB ST 25 TCS, 32h, Tubeless Ready
front hub Formula, 15x110mm
rear hub Formula 12x148mm, HG Freehub Body
front tire WTB Vigilante Comp, 26 x 2.3*
rear tire WTB Vigilante Comp. 26 x 2.3*


rear derailleur MicroSHIFT Advent-X
shifters MicroSHIFT Advent X, 10-speed
rear cogs MicroSHIFT. 11-48. 10-speed
chain KMC X10, 10-speed
crank Prowheel MPX. 30T
bottom bracket Cartridge, square taper
pedals GT Flat Pedal, resin


handlebar Steel Riser Bar, 20mm Rise, 600mm
stem GT Alloy, 35mm
grips GT MTB
headset FSA NO. 42e
seatpost TranzX Dropper, 31.6mm, 80mm
saddle WTB Silverado


brakes Hydraulic Disc Brake
Please note that, based on component availability and other factors, specifications are subject to change without notice.

Fit Guide

12" Wheels
2'10" - 3'4"
16" Wheels
3'4" - 4'0"
20" Wheels
4'0" - 4'5"
24" wheels
4'3" - 4'8"
26" wheels
4'3" - 4'8"


Sizes (mm) One Size
Seat tube length 32.5
Seat tube angle effective 76.5 °
Seat tube angle actual 78 °
Top tube horizontal 46.4
Top tube actual 47.4
Head tube angle 65 °
Standover 67.5
Head tube length 9.5
Stem length 40
Wheelbase 105.8
Front center 63.3
Chainstay length 42.5
Bottom bracket drop 0.7
Bottom bracket height 34
Fork rake 4.6
Trail 11.1
Stack 53.8
Reach 33.5
Travel rear 12.1

GT Tech Book

GT Owner's Manual