The V12 Integrated Pedal Assist Sensor (PAS) is an essential component for riders seeking a seamless looking pedal assist. However, compatibility depends on specific measurements and bottom bracket types which can be tricky to work out. Here’s how to check if it fits your bike.
Step 1: Understand the Compatibility Criteria
- Crank Arm Gap Measurement
- Measure the gap between the frame and the end of the crank arm.
- The gap should be 5-9mm.
Spindle End Gap Measurement
- Alternatively, if the crank arm is removed, measure the gap between the frame and the end of the bottom bracket spindle.
- This gap should be 13-18mm.
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Spindle Length
- A 107mm spindle length bottom bracket is generally the best fit.
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Spline Count
- In order for the Integrated Pedal Sensor to fit, you need to count the number of spines on your bottom bracket. It should have 20 splines.
Step 2: Identify Your Bottom Bracket Type
Most bottom brackets with square taper spindles are compatible. However, ensure the following:
Spindle Shape: The PAS-V12 must sit on the square taper, not the round portion of the spindle. If your bottom bracket looks like the one on the right, see below if you can use a spacer to get the right fitment.
Step 3: Use of Spacers (If required)
- If the spindle length creates a gap larger than 7mm or the round portion of the spindle is by the edge preventing the V12 from sitting, you can add a spacer. The spacer shifts the bottom bracket shell outward slightly, allowing the V12 to sit securely on the square taper of the spindle.
- You can use bottom bracket spacers to adjust the fit.
- Note: Spacers are only effective with certain bottom brackets where it has a lip to hold the spacer in place.
Step 4: Confirm Installation Compatibility
- The ideal gap between the crank arm and the bottom bracket shell is 7mm.
- Gaps smaller than this may cause the PAS-V12 to compress and stop rotating freely.
- Larger gaps may prevent the PAS-V12 from sitting securely.