to7motor@SZ
New-ish here
We put together some compatibility notes for installing Toseven DM-series mid-drive motors on a range of Giant frames and wanted to share a few patterns that may help others planning a conversion.
For reference, the motors discussed are:
Both systems use integrated torque + cadence sensing and mount in the bottom bracket area similar to other mid-drive conversions.
One of the biggest variables across Giant frames is the bottom bracket standard.
Older and many aluminum frames still use BSA threaded shells (68–73 mm), which generally install without much complication.
Many newer models (including several Fathom, Trance, and Stance frames) use BB92 press-fit shells. In those cases installation may require:
Without additional axle length, thread engagement can sometimes be limited once the motor and mounting hardware are installed.
For Giant Advanced Composite carbon frames, extra care is recommended with high-torque mid-drives.
Mid-drive systems concentrate torque at the bottom bracket area, and the DM01’s maximum output (~160 Nm) can place significant load on that section of the frame.
A more conservative setup often used on carbon frames is:
Careful installation and proper torque settings are important.
On several ALUXX aluminum frames (including commuter-style geometry such as Escape-type layouts), larger chainring offsets can reduce clearance between the chainring and the chainstay.
In many cases:
Exact clearance depends on frame size, drivetrain setup, and chainring diameter, so it’s worth checking before installation.
One setup detail worth noting:
When powering on the system, keep all weight off the pedals for a few seconds so the torque sensor can establish its zero-load baseline.
If pressure is applied during startup, the assist response can feel inconsistent until the system is restarted.
A compatibility overview covering several Giant models is included in the guide, including:
along with notes about bottom bracket types and adapter hardware that may be required.
Full guide and compatibility table here:
Giant Bicycle Mid-Drive E-Bike Conversion: The Ultimate Engineering Guide (Toseven DM01 & DM02)
If anyone here has installed these motors on other Giant frames, it would be interesting to hear what fitment challenges came up.
As always with DIY conversions, make sure the braking system, drivetrain, and frame are suitable for the additional power and weight, and confirm your build complies with local e-bike regulations.
For reference, the motors discussed are:
- DM01 – up to 1000 W and ~160 Nm output torque
- DM02 – up to 500 W and ~90 Nm output torque
Both systems use integrated torque + cadence sensing and mount in the bottom bracket area similar to other mid-drive conversions.
Bottom Bracket Compatibility
One of the biggest variables across Giant frames is the bottom bracket standard.
Older and many aluminum frames still use BSA threaded shells (68–73 mm), which generally install without much complication.
Many newer models (including several Fathom, Trance, and Stance frames) use BB92 press-fit shells. In those cases installation may require:
- a longer motor axle configuration (for example the 100 mm version), or
- press-fit reducer bushings to interface properly with the shell.
Without additional axle length, thread engagement can sometimes be limited once the motor and mounting hardware are installed.
Carbon Frames
For Giant Advanced Composite carbon frames, extra care is recommended with high-torque mid-drives.
Mid-drive systems concentrate torque at the bottom bracket area, and the DM01’s maximum output (~160 Nm) can place significant load on that section of the frame.
A more conservative setup often used on carbon frames is:
- DM02 motor
- reduced assist settings
- protective interface pads between motor and frame
Careful installation and proper torque settings are important.
Chainline and Chainring Offset
On several ALUXX aluminum frames (including commuter-style geometry such as Escape-type layouts), larger chainring offsets can reduce clearance between the chainring and the chainstay.
In many cases:
- larger offsets (~9 mm) may contact the frame
- 0–3 mm offset rings tend to clear more reliably
Exact clearance depends on frame size, drivetrain setup, and chainring diameter, so it’s worth checking before installation.
Torque Sensor Startup Behavior
One setup detail worth noting:
When powering on the system, keep all weight off the pedals for a few seconds so the torque sensor can establish its zero-load baseline.
If pressure is applied during startup, the assist response can feel inconsistent until the system is restarted.
Compatibility Table
A compatibility overview covering several Giant models is included in the guide, including:
- Talon
- Roam
- ATX
- Fathom
- Revolt
along with notes about bottom bracket types and adapter hardware that may be required.
Full guide and compatibility table here:
Giant Bicycle Mid-Drive E-Bike Conversion: The Ultimate Engineering Guide (Toseven DM01 & DM02)
If anyone here has installed these motors on other Giant frames, it would be interesting to hear what fitment challenges came up.
As always with DIY conversions, make sure the braking system, drivetrain, and frame are suitable for the additional power and weight, and confirm your build complies with local e-bike regulations.
