What's included with your GTRO order?

When you order your GTRO gearbox, it will be equipped with all necessary components to install your gearbox. Additional spare components can be purchased separately. 
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Your GTRO 3-Speed Gearbox Kit:

1 x GTRO Gearbox (Right Crank)

1 x Left Crank

1 x 3-Speed Shifter

1 x Bottom Bracket

1 x 5ml Maintenance Oil

1 x Fixings Kit

Find Your Optimal Drive Ratio 

Don't guess how the GTRO will feel—calculate it. Input your available front and rear gear options to see exactly how they translate into real-world performance. This tool helps you confirm that your specific setup covers the range you need for both climbing and cruising.

Gear Ratio & Inch Calculator

Gear Equiv. Front Gear Ratio Gear Inch
1 - - -
2 - - -
3 - - -

Build your GTRO

GTRO 3-Speed Gearbox kit

GTRO 3-Speed Gearbox kit

£499.00

G3ARED’s GTRO Gearbox is the perfect solution to achieve gear shifting with a rear hub motor belt drive. It is designed as a universal component for all popular e-bike models such as touring, city, fat and folding style frames. The GTRO is compatible with all 5-Arm 130BCD belt/chain drive systems and provides the most cost-effective option for those looking to achieve a belt-driven geared solution. 

Contents:

  • GTRO Gearbox (Right Crank)
  • Left Crank
  • 3-Speed Shifter
  • Bottom Bracket
  • 5ml GTRO Maintenance Oil
  • Fixings Kit -
    • 2 x Crank Bolts
    • 5 x BCD Bolts
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Bottom Bracket Width
Shifter Installation
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Bottom Bracket Width
Shifter Installation
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Bottom Bracket Width
Shifter Installation
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Pre-Tensioner Position

Gearbox to Pre-Tensioner Length In Millimeters 

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100mm Pre-Tensioner Length

Pre-Tensioner to Shifter Length In Millimeters 

Pre-Tensioner Guide

Please ensure you read our pre-tensioner guide before requesting your cable length.
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All cables are manually cut to +10mm / -0.0mm.
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We're here to help

Unsure about your order details? We’ve got you covered. At G3ARED, we are committed to outstanding service. We personally reach out after every order to answer questions and confirm your specs. You can purchase your GTRO with total peace of mind knowing you’re buying from the best.

Contact Us

How do I install my gearbox?

To learn how to install your gearbox, please follow the attached link below to our fitment guide. 

Fitment Guide

Should I install the shifter myself?

Installing the shifter yourself should only be done if you plan to route your shifter cable internally through your frame. 

 

Otherwise, we recommend opting to have the shifter fitted from factory for the easiest installation experience.

What's my bottom bracket width?

To locate your bicycles bottom bracket width, we recommend doing one of the following:

 

Remove the existing bottom bracket and check for product information.

Measure the internal distance between the bottom bracket cups, or measuring the bottom bracket shell width on your frame.

Contacting the original bike manufacturer for technical information. 

How do I decide my pre-tensioner position?

We advise you refer to our pre-tensioner guide below, which helps explain what a pre-tensioner is and how to find your ideal cable length/position. 

Pre-Tensioner Guide

Have a question thats not answered here? It might be just one click away! Checkout our FAQ page. 

FAQ Page

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