How to Convert a Giant Bicycle to an E-Bike Using Toseven’s Mid-Drive DM01/DM02

Why Giant Bikes are Excellent for E-Bike Conversions

When you add an electric mid-drive motor to a bicycle, you are introducing a massive amount of pulling force—known as torque—to the frame. The Toseven DM01, for example, generates up to 160 Newton-meters (Nm) of torque. This extreme twisting force can deform or crack weak frames, especially around the pedal area.

Fortunately, Giant bicycles are structurally robust. Giant manufactures its own proprietary “ALUXX” aluminum frames, which utilize a high-strength 6061 alloy and reinforced, butted tubing. This engineering makes Giant’s mountain and hybrid frames incredibly strong and well-suited to handle the stress of a high-torque Toseven motor safely.

Key Terms You Need to Know (Beginner’s Glossary)

Before we look at your specific bike model, let’s explain a few mechanical terms in plain English:

Giant Model Compatibility Breakdown

Here is exactly what you can expect when converting the most common Giant bicycle families.

If there is one section of this guide you must read carefully, it is this one. The bottom bracket (often abbreviated as “BB”) is the mechanical heart of your bicycle. It is the hollow metal tube at the lowest point of your frame where the pedal crank arms attach. 

When you convert a bike to an e-bike, the entire electric motor slides directly into this tube. Because different Giant bicycle models use different bottom bracket designs, understanding your frame’s specific standard is the difference between a flawless, professional installation and a costly, frustrating mistake. Let us break down the engineering behind bottom brackets in plain, easy-to-understand language.

The Difference Between Threaded BSA, Press-Fit, and Wide Shells

Bicycle frames generally use one of these bottom bracket designs: 1. Threaded BSA (The Classic Standard)Found on the Giant Talon, Escape, Roam, ATX, Cypress, and Sedona, the BSA (British Standard Cycle) bottom bracket is the traditional, industry-standard design.

2. Press-Fit BB86 and BB92 (The Modern Standard)Found on higher-end performance bikes like the Giant Fathom (mountain) and Giant Defy, TCR, Propel, and Revolt (road/gravel), Press-Fit is a newer standard designed to make frames lighter and stiffer.

3. Extra-Wide Press-Fit (BB121 Fat Bike Standard)Found on specialized fat bikes like the Giant Yukon.

Why Toseven Motors Are Designed for Threaded BSA

Toseven mid-drive motors (both the heavy-duty DM01 and the lighter DM02) are natively engineered to fit perfectly into Threaded BSA frames. The main shaft of the Toseven motor is a solid cylinder of steel measuring 33.5mm in diameter. This dimension is intentional: it allows the motor to slide effortlessly through the 34.8mm threaded hole of a Giant Talon or Escape. Once the motor slides through, large steel locking nuts are threaded onto the motor shaft on the opposite side, clamping the motor tightly against the outside faces of the bicycle frame. Because the motor clamps securely against the flat outer edges of a 68mm or 73mm threaded shell, the installation is rock-solid and incredibly strong.

Adapting Press-Fit Frames (BB86 and BB92) for Toseven Motors

If you own a Giant Fathom, you might be thinking: “My frame’s hole is 41mm wide, but the motor shaft is only 33.5mm. Won’t it just flop around inside?” Yes, it will. You absolutely cannot install a Toseven motor directly into a BB86 or BB92 frame without bridging the gap. To solve this, you must use the official Toseven CNC High-Precision Reducer Support Bushings supplied directly by the Toseven factory or authorized distributor. These precision-machined components are engineered to convert the 41mm frame opening to the 33.5mm motor spindle while distributing the 160Nm of torque evenly across the frame wall. Toseven provides compatible solutions for Press-Fit frames. Always source adapters and spare parts directly from the Toseven factory. Factory-supplied components ensure correct machining tolerances. Using incompatible or low-precision adapters may result in improper fitment.

How the Official Adapter Works:

The Engineering Warning: Torque Stress and Machining Tolerances

When you accelerate up a steep hill, a Toseven DM01 generates up to 160 Newton-meters (Nm) of torque. This is an immense amount of twisting force. The motor physically wants to pivot backward around your bottom bracket. In a threaded BSA frame, the locking nuts easily resist this twist. However, in a smooth, threadless Press-Fit frame, this twisting force must be managed perfectly. This is why the official two-piece thread-together adapter is mandatory. When you tighten the official adapter down, it permanently locks the adapter and the motor in place, meaning the 160Nm twisting force is safely transferred to the aluminum frame without any slipping. Proper shell alignment and utilizing the factory-supplied adapter are the secrets to a quiet, powerful, and indestructible e-bike.

The Engineering Warning: Carbon Fiber Shells (TCR / Propel / Revolt Advanced)

While aluminum frames like the Giant Fathom handle this torque brilliantly, you must exercise extreme caution with carbon fiber. High-torque motors like the DM01 are generally Not recommended for carbon frames. Carbon shells (like the BB86 found on the TCR and Propel) are engineered using directional layups designed to resist human pedaling forces, not the external, localized clamping pressure of a metal motor unit. The clamping force required to secure the motor and press-fit adapters can easily crush the carbon shell. Furthermore, press-fit adapters transfer torque differently in carbon versus aluminum, and excessive torque heavily stresses bonded frame junctions.

When you begin researching how to convert your bicycle, you will quickly encounter the term “chainline.” While it sounds highly technical, it is actually a very simple physical concept. Understanding and correcting your chainline is the secret to an e-bike that shifts smoothly and rides quietly. Let us break down exactly what chainline geometry is, how the motor changes it, and how we fix it using specific front gears.

What is Chainline Geometry and Why Does it Matter?

Chainline refers to the imaginary, straight line that runs from your front gear (known as the chainring) to your rear gears (known as the cassette). On a perfect, factory-built bicycle, if you shift your chain into the exact middle gear in the back, the chain will form a perfectly straight line from front to back. A proper chainline ensures smooth, efficient shifting across all of your gears, minimizing noise and preventing the metal components from wearing down prematurely.

The Mid-Drive Problem

When we install a Toseven DM01 or DM02 motor into your Giant’s bottom bracket, we are adding a physically wide piece of machinery between the frame and the pedals. Because the motor takes up space, it naturally pushes your new front chainring further outward—away from the bicycle frame. If we leave it like this, your front gear is now sitting too far to the right. 

When you try to shift into your lowest gears (the largest cogs in the back that you use for climbing steep hills), the chain has to stretch at a severe diagonal angle to reach them. This extreme angle is called “cross-chaining.” The Consequences of Incorrect Alignment: If you ignore chainline geometry, you will experience highly frustrating mechanical issues:

The Engineering Solution: 0mm vs 9mm Offset Chainrings

To solve the problem of the motor pushing the gear too far outward, Toseven manufactures two different types of chainrings for their motors: 0mm offset and 9mm offset.

Using an offset chainring is essential in most mid-drive conversions because it compensates for the wider motor, moving the chain closer to the frame and ensuring a straighter chain angle. This single part restores your bike’s quiet, reliable shifting.

Matching Offset to Your Giant Frame

To choose the correct chainring, we have to look at your bike’s rear wheel width. In the bicycle industry, rear wheel hub widths dictate where your cassette sits.

1Non-Boost Frames (135mm or 142mm wide)

Older mountain bikes, as well as the Giant Escape (city), Giant Roam (hybrid), Giant ATX, and Giant Talon (XC mountain), utilize standard, narrower rear wheels. Because the rear gears sit closer to the center of the bike, the front gear also needs to sit closer to the center.

2Boost Frames (148mm wide)

Modern, progressive mountain bikes like the Giant Fathom and full-suspension Giant Trance use “Boost” spacing. Boost means the rear wheel is physically wider, which naturally pushes the rear gears further outward.

3Gravel & Variable Geometry (Giant Revolt Flip-Chip)

The Giant Revolt utilizes a 142mm rear thru-axle, but it features a unique “Flip-Chip” rear dropout that allows you to change the bike’s wheelbase.

4Fat Bike Extra-Wide Spacing (Giant Yukon – 197mm wide)

The Giant Yukon features a massive 197mm rear hub spacing to accommodate fat tires, which pushes the rear cassette exceptionally far outward.

Welcome to the workshop phase. Now that we have verified your bottom bracket and corrected your chainline, it is time to physically mount the Toseven DM01 or DM02 motor to your Giant frame.

Taking your time here separates a reliable, whisper-quiet e-bike from a creaky, problematic one. We are going to walk through the mechanical procedure step-by-step, utilizing the exact factory torque specifications.

1. The Required Tools List

To safely remove your old bicycle components and install the new electric mid-drive, you need a few specific tools. Do not attempt this with adjustable pliers or hammers, as you will damage your frame.

2. Motor Housing Rotation Positioning

Once your bottom bracket shell is completely empty and clean, slide the Toseven motor axle through the frame’s bottom bracket hole from the right side (the drive side). The motor is heavy and will naturally want to hang straight down toward the ground.

You cannot leave it there. You must physically grab the motor casing and rotate it clockwise (upward) until the motor body sits as close to your Giant’s down tube as possible, stopping when it makes firm contact with the frame.

3. Navigating Giant Internal Cable Routing

Modern Giant bicycles feature internal cable routing, meaning your derailleur and brake cables run invisibly inside the frame and exit through integrated ports near the bottom bracket.

Carefully pull any slack out of your brake and gear cables, and route them cleanly around the outside of the motor casing using the provided split cable wraps.

4. Avoiding Interference with Giant Maestro Suspension

Note: If you are converting a hardtail like the Giant Fathom or a standard city bike, you can skip this step. This is strictly for full-suspension mountain bikes. If you are converting a Giant Trance or Giant Stance, your bike uses Giant’s proprietary “Maestro” suspension system.

This system utilizes a complex metal linkage that pivots right behind the bottom bracket. The Golden Rule of Full-Suspension Conversions: You must check clearance at full compression. To do this safely:

5. The “Frame Triangle” Battery Clearance Check

Giant frames, especially full-suspension models like the Trance or Stance, have very limited space inside the main front triangle.

Step-by-Step Mechanical Installation Blueprint

Here is the exact, step-by-step mechanical blueprint to install the DM01 or DM02 mid-drive unit onto your Giant frame.

Congratulations on getting the hardware installed! Now that your Toseven DM01 or DM02 motor is securely mounted to your Giant frame, it is time to wake up the system. 

This section covers programming the “brain” of your new e-bike through the T24 display. Proper programming and calibration are the secrets to making your converted Giant bike feel smooth, intuitive, and natural—just like a high-end, factory-built electric bike. Let us break down these concepts into simple steps.

Understanding Your T24 Display

The T24 display is the digital command center mounted on your handlebars. It is a full-color, waterproof screen that shows you all your essential ride data, such as speed, battery life, and power output. Out of the box, the T24 display gives you three main Power Modes to choose from, which limit the maximum power the motor will draw from the battery:

Within these modes, you also have 5 levels of Pedal Assist (PAS). The PAS level dictates how much the motor helps you while you are actively pedaling. If you prefer a simpler setup or want even more fine-tuned control, you can use the display menu to change the system to offer either 3 or 8 assist levels instead of 5.

Setting the Wheel Size

One of the first things you need to do in the basic settings menu is input your bicycle’s wheel size. Because the speed sensor relies on the wheel spinning to calculate your speed, telling the computer the correct wheel size ensures your speedometer and odometer are completely accurate. Giant bicycles use a variety of wheel sizes depending on the model:

The Magic of the Torque Sensor

Most basic e-bike kits use a standard “cadence sensor,” which acts like an on/off switch: the moment you start spinning the pedals, the motor kicks in at a fixed speed. The Toseven DM01 and DM02 motors are vastly superior because they feature a built-in torque sensor alongside the cadence sensor. A torque sensor physically measures how hard you are pushing down on the pedals.

This proportional power delivery is what gives the bike a natural, intuitive feel, giving you finer control at low speeds and making you feel like you have bionic legs. 

It is important to note that the basic pedal assist (PAS) sensor and the torque sensor must both be activated simultaneously in the settings; they work together in tandem and the PAS function cannot be deactivated independently.

The Golden Rule of Torque Calibration

The torque sensor performs an initial baseline calibration during startup. For optimal accuracy, keep your feet off the pedals while powering on. This ensures the system reads true zero-load conditions. 

This is considered a best practice for accurate torque sensing and guarantees your motor will deliver peak performance and intuitive power proportionality exactly as engineered. To ensure proper baseline calibration:

Advanced Settings and Ride Feel Tuning

One of the best features of the Toseven system is that you can adjust almost every motor parameter directly from the T24 display without needing special programming cables. Inside the advanced settings, you can adjust the sensitivity of the torque sensor. 

Depending on your riding style, you may prefer a more gradual power delivery from a dead stop rather than an instant surge. If so, try changing the torque sensor setting from “Sensitive” to “Safe” mode, which provides a smoother, more predictable ramp-up of power.

Welcome to the final section of our guide! As a professional conversion engineer, I have seen first-time builders run into a few common hurdles. Most issues are simple to prevent and easy to resolve through proper engineering practices. 

Here are the most frequently asked questions regarding safety, compatibility, and troubleshooting when you convert your Giant bicycle into an e-bike.