GT eForce Amp+ 29

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GT eForce Amp+ 29
GT eForce Amp+ 29
GT eForce Amp+ 29

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Please Note: Bikes are built to order. During busy periods lead times may be several weeks.

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Developed for big hitters and gravity hogs 

It's no secret we're big fans of eBikes here at Stif. Despite all the huffing that goes on in comment sections around the web, we're yet to find a mountain biker who hasn't returned from their first eBike lap grinning from ear to ear. Chances are, if you've made it to this page, you already know just how much fun they are. GT took their time to take their first-steps into the eBike world, but they've absolutely nailed it on their first go.

This eForce Amp from GT turns the fun up to 11 from the moment you throw a leg over it. Mid-travel, a proven suspension platform and geometry that's modern but relatively conservative means you're immediately at home. It's a mountain biker's mountain bike, just one that has the ability to unlock more miles, more laps and more fun in every ride.

Built around the fantastic Shimano Steps EP8 platform paired with a 630wh battery and rolling on 29" wheels, there's very little you could put in the eForce's way that it won't overcome. GT's LTS 4-Bar linkage platform and solid Rockshox offerings at either end keep the bike planted and predictable no matter how steep the climb or rowdy the descent. The eForce's ability to keep calm and devour a climb yet inspire buckets of confidence of on the descents is a testament to the R&D GT have put into the bike, as is the well thought out spec.

Keeping an eBike wallet friendly is no mean feat. Their ability to generate speed and plough through the gnarliest terrain means the prospect of finding some corners were cut to hit a price point mid-ride could be terrifying. Fortunately, GT have nailed the spec on the eForce too. It's not dripping in 'factory' everything, but it's premium where it matters and solid and reliable everywhere else - all you'll have to worry about is how much fun you're having.

From The Manufacturer:

Featuring GT’s e-tuned LTS platform with Shimano’s STEPS EP8 Drive Unit, Shimano 630Wh Battery, 29” wheels, 150mm of travel, and RockShox suspension the Force Amp+ is brimming with watts and ready to party up and down the trails.

Love the Force but reckon you've got the legs to get there yourself? : Check out the GT Force
Looking for a big travel eBike to ditch the uplift on park days? : Check out the Santa Cruz Bullit

GT eForce Features

  • Fork Travel : 150mm
  • Max Fork Length : 557mm
  • Frame Travel : 150mm
  • Shock Size : 185mm x 55mm Metric Trunnion
  • Headset : IS42 Top/IS52 Bottom
  • Seatpost Diameter : 31.6mm
  • Seat Clamp Diameter : 34.9mm
  • Max Tyre Size : 2.6"
  • Rear Brake Mount : PM 180
  • Max Rotor Size (rear) : 203mm
  • Water Bottle Mounts : 1
  • Shock Mounting Bushing : 37.6 x M8

GT eForce Amp+ 29



Rear Derailleur













Front Tyre

Rear Tyre

Front Hub

Rear Hub




Drive Unit




Please Note: Whilst we do our best to keep this information accurate, due to the availability of components some parts listed here may be swapped in order to avoid lengthy delays.


geoDiagram-wheelbase geoDiagram-topTubeLength geoDiagram-standOverHeight geoDiagram-stack geoDiagram-seatTubeAngle geoDiagram-seatTubeLength geoDiagram-reach geoDiagram-headTubeAngle geoDiagram-frontCenter geoDiagram-headTubeLength geoDiagram-chainStayLength geoDiagram-bbDrop geoDiagram-bbHeight geoDiagram
Reach 425mm 450mm 475mm 500mm
Stack 617mm 617mm 617mm 617mm
Head Tube Angle 65° 65° 65° 65°
Seat Tube Length 430mm 450mm 480mm 510mm
Front Center 756mm 781mm 806mm 835mm
BB Height 349mm 349mm 349mm 349mm
BB Drop 3mm 3mm 3mm 3mm
Wheelbase 1209mm 1234mm 1259mm 1288mm
Chainstay Length 455mm 455mm 455mm 455mm
Head Tube Length 115mm 115mm 115mm 124mm
Top Tube Length 539mm 562mm 588mm 617mm
Seat Tube Angle 76° 76° 76° 76°
Standover Height 735mm 739mm 755mm 776mm
Eye to Eye Length 185mm 185mm 185mm 185mm

Delivery & Returns

Warranty Info

Delivery & Returns

Unless otherwise specified we will use a Royal Mail Tracked Delivery service to dispatch your order. Once your order is dispatched you will receive an email with a tracking number. You are able to track your order at

For high value, pressurised or liquid goods we use FedEx Tracked 24hr service. FedEx Orders can be tracked at


Orders under £19.99

Royal Mail 48 Tracked: £3.49

Royal Mail 24 Tracked*: £4.49

Fed-Ex**: £6.50

Orders £20 - £49.99

Royal Mail 48 Tracked: £2.49

Royal Mail 24 Tracked*: £3.49

Fed-Ex: £5.99

Over £50 - £99.98

Royal Mail 48 Tracked: FREE

Royal Mail 24 Tracked*: £1.00

FedEx 24 Hour: £3.99

Over £99.99

Royal Mail 24 Tracked*: FREE

FedEx 24 Hour**: FREE

* Royal Mail 24 Tracked Next Working Day if ordered before 3.30pm Mon-Fri

**FedEx 24 Hour for orders placed before 12:00pm Mon-Fri

*Orders shipping to Northern Ireland via Courier will be subject to a delivery charge, we will be in touch upon receiving your order to discuss your delivery charge or you can Contact Us to discuss pricing prior to ordering.

Bike Orders

All bikes and frames are shipped with FedEX 24hr Tracked Delivery within the UK. Bikes are assembled and fully checked by our mechanics prior to dispatch, therefore lead times can vary. One of our sales team will contact you upon receipt of your order to arrange a suitable delivery date

International Orders

International Orders are sent using Royal Mail International Tracked Delivery. These items are usually delivered within 3-7 working days of despatch.

All International order postage costs are an estimate. If the estimate is correct your order will be shipped immediately. In the rare event that the postage estimate won't cover your delivery we will contact you with a postage quote.

For full details of our returns policy, follow this link.


Lifetime Frame Warranty

Santa Cruz Bicycles will repair or replace at its option any frame or rigid fork made by Santa Cruz Bicycles it determines to be defective in materials or workmanship. The warranty will be in effect for the lifetime of the frame or fork and is available only to the original owner. Notwithstanding the foregoing, frames purchased prior to May 1, 2015 are covered under the previously-existing warranty for five years from the original date of purchase.

Lifetime Reserve Carbon Wheels Warranty

Santa Cruz Bicycles will repair or replace at its option any Reserve rim made by Santa Cruz Bicycles that is damaged or destroyed by riding. The warranty will be in effect for the lifetime of the rim and is available only to the original owner.

Lifetime Bearing Warranty

Santa Cruz Bicycles pivot bearings are warranted for life to the original owner of the bike. The return process is simple: Fill out the Warranty Bearing Replacement Form, upload a copy of your purchase receipt, and we'll get a new set of bearings out to you within 48 hours!

Lifetime Handlebars Warranty

Santa Cruz carbon handlebars are warranted against defects in materials and workmanship for life from the original date of purchase.

No-Fault Replacement

In the event of a non-warranty situation, Santa Cruz Bicycles will make replacement parts available to the original owner at a reduced charge for the applicable warranty period described above.

Limitations, Exclusions, and Disclaimers

The sole remedy available under the foregoing express warranty and all implied warranties is the repair or replacement of defective parts with those of equal or greater value, as determined by Santa Cruz Bicycles in its sole discretion. The warranty does not cover labor costs, custom finishes, normal wear and tear, or damage from commercial use. The warranty is void if the part is modified from its original condition in any manner or used outside normal intended use, as determined by Santa Cruz Bicycles in its sole discretion. The warranty for damage arising from accidents, crashes and other impacts is limited to offered replacement at a reduced charge as set forth above. Any implied warranties (including without limitation the warranties of merchantability and fitness for particular purpose) which may not be disclaimed under applicable law are limited in duration to the period set forth above or the applicable statute of limitations, whichever is shorter.

The foregoing warranty is the sole and exclusive warranty offered by Santa Cruz Bicycles. To the maximum extent permitted by applicable law, all other express and implied warranties (including without limitation the warranties of merchantability and fitness for a particular purpose) are hereby disclaimed. To the maximum extent permitted by applicable law, in no event shall Santa Cruz bicycles or any of its owners, officers, employees, representatives, agents, or affiliates (or any of their respective successors or assigns) be responsible or otherwise liable for any direct, incidental or consequential damages arising from the purchase, use, or ownership of its products, including without limitation damages for personal injury, property damage, or economic losses, whether based on contract, warranty, negligence, product liability, or any other theory.

Some states and countries do not allow some or all of the foregoing exclusions or limitations, so they may not apply to you. If any portion of the foregoing warranty (or the exclusions or limitations thereto) is deemed invalid or unenforceable pursuant to applicable law, it shall be deemed modified so as to be valid and enforceable to the maximum extent consistent with such law. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state and country to country.

Stif Squatch / Morf

Our Squatch and Morf Frames are sold with a 3 Year warranty against manufacturing defects and we offer Crash Replacement Pricing for 5 years from purchase

GT Warranty

Every bicycle has a useful product lifespan. This limited warranty is not meant to suggest or imply that the frame or components can never be broken or will last forever. This limited warranty covers manufacturing defects that occur within the normal lifespan and use of the product.

GT bicycles must be registered on or in person by a GT Retailer in order to activate the lifetime frame warranty described below.

Frames, excluding those listed below: Lifetime of the original owner.

Frames of Gravity, Freeride, Downhill, Dirt Jump and other ASTM Category Five Bicycles: Three years from original retail purchase.

Swing Arms, Chainstays, Seatstays, and Shock Links of Full Suspension Frames: Five years from original retail purchase.

GT Branded Components: One year from original retail purchase.

for more details on GT Warranty T&Cs visit