GT eForce Amp 2021 - Electric Mountain Bike

The Force Amp is performance... enhanced. With 29” wheels, 150mm of travel, RockShox suspension, and Shimano's STePS E8000 Drive Unit, the Force Amp is so much fun that it should be e-legal.
Key Features:
- Fully integrated battery for a clean and mean look
- “Performance-enhanced” LTS platform
- 29” wheels for extra rolling power
Occasionally, without notice, manufacturers change product design and/or specifications.
Frame | eForce Alloy 29” Frame, 150mm Travel, Shimano STEPS Specific, Internal Battery, LockR Pivots, Tapered Head Tube, Boost 12x148 Thru-Axle, 185x55mm Trunnion Shock Mount |
Fork | RockShox 35 Gold RL, 150mm, 15x110mm Boost , E-MTB, 44mm offset |
Rear Shock | RockShox Deluxe Select R, 185x55mm Trunnion, Debonair |
Headset | FSA No.42, Semi-integrated, Sealed Bearing, Tapered |
Stem | GT All Terra, 6061 Alloy, 31.8 |
Bars | GT All Terra Riser, 6061 Alloy, 15mm Rise, 8° Sweep, 4° Rise, 780mm Width |
Front Brake | Shimano MT420 4-Piston Hydro Disc, 203mm RT30 Rotors |
Rear Brake | Shimano MT420 4-Piston Hydro Disc, 203mm RT30 Rotors |
Rear Mech | SRAM SX Eagle |
Shifters | SRAM SX Eagle, 12-speed |
Speed | 12 |
Rims | WTB STX i30 TCS, 32h, tubeless ready |
Front Hub | Shimano MT400, 15x110 |
Rear Hub | Shimano MT400, 12x148 |
Spokes | Stainless Steel, 14g |
Front Tyre | Maxxis Minion DHF, 29 x 2.6", 3C Maxx Terra, EXO+ |
Rear Tyre | Maxxis Minion DHR II, 29 x 2.6", 3C Maxx Terra, EXO+ |
Seat Post | TranzX Dropper, Internal Routing, 31.6 |
Saddle | WTB Silverado Sport |
Chainset | Shimano FC-EM600, 165mm, 34t |
Chain | SRAM SX Eagle, 12-speed |
Cassette | SRAM SX Eagle, 11-50, 12-speed |
Pedals | GT Slim Line Flat Pedal |
Battery Size (WH) | Shimano STEPS BT-E8035, 504Wh |
Motor | Shimano STEPS DU-EP800 250W |
User Interface | Shimano EM8 Display |
Electric Bike Bike Size Chart
Height |
e Bike Size |
e Road Bike Size |
e Mountain Bike Size* |
4’8” – 5’1” 143 – 155 cm |
XXS |
44 cm |
13” (33 cm) |
5’1” – 5’4” 155 – 163 cm |
XS |
48 cm |
15” (38 cm) |
5’4” – 5’7” 163 – 170 cm |
S |
51 cm |
16” (41 cm) |
5’7” – 5’10” 170 – 178 cm |
M |
54 cm |
18” (46cm) |
5’10” – 6’0” 178 – 183 cm |
L |
56 cm |
19” (48cm) |
6’0” – 6’3” 183 – 191 cm |
XL |
58 cm |
20” (51 cm) |
6’3” – 6’5” 191 – 196 cm |
XXL |
60 cm |
21” (53 cm) |
6’5” – 6’9” 196 – 205 cm |
XXXL |
62 cm |
22” (56 cm) |
* Mountain bikes are sized differently to road bikes. Typically, they are sized in inches as the first MTBs were produced in the USA. European brands like Lapierre and Haibike like to use centimeters for all their bikes. The measurements of their mountain bikes doesn’t match their road bikes but is like a simple conversion from the inches measurement. This is why we have included cm measurements in brackets for the e mountain bike column.
See our bike size guide for more on bike sizing
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