VIVI Electric Bike Left Crank Arms: AMAK Series Buyer's Guide

Replacing a damaged left crank arm on a VIVI electric bike requires matching the specific production series, such as the AMAK series utilized for 2024 and later models including the C26UL. Selecting the correct component prevents mismatched threading, loose fits, or complete incompatibility caused by mid-generation manufacturer updates.

Who Should Buy This Replacement Part

This specific left crank arm is intended for owners of VIVI electric bikes manufactured from 2024 onward, or those whose frame labels begin with the "AMAK~" prefix. Common model numbers requiring this exact part include the C26UL, F26FUL, ACE01, and related 2024-era city or mountain e-bikes.

You should purchase this component if your current left crank arm exhibits stripped pedal threads from improper installation, structural bending from an impact, or persistent loosening where the square-taper interface has rounded out. It is not a performance upgrade or a universal accessory; it is a strict structural repair part meant to restore standard human-pedaling capabilities to your drivetrain.

Identifying Your VIVI Frame Series

Before ordering, inspect the identification label permanently affixed to your e-bike's frame tubes. VIVI splits its component ecosystem into distinct generations that use incompatible internal interface dimensions and offsets:

• AMAK Series (2024 and Later): Covers models featuring frame serial numbers starting with "AMAK~" or modern variants like the C26UL and F26FUL.
• SPA Series (2021–2023): Covers older variations marked with "SPA~" prefixes or legacy names like the original M026TGB.

Do not assume cross-compatibility between these series. Installing an AMAK-designated arm on an older SPA-generation bottom bracket axle can result in incorrect Q-factor alignment (the horizontal distance between your crank arms) and potential interference with your frame or motor housing.

Total Ownership Costs and Installation Tools

The baseline financial outlay for a replacement VIVI left crank arm typically sits around thirty dollars, excluding shipping fees or local taxes. However, fixing a crank arm involves auxiliary tool costs if you do not already maintain a bicycle toolkit.

Successfully executing the swap requires a specialized crank puller tool to safely unseat the arm from the tapered bottom bracket axle, alongside a standard hex wrench set and a 15mm pedal wrench. If you lack these tools and prefer not to purchase them for a single repair, taking the part and your e-bike to a local bicycle shop will incur standard labor service fees. Professional installation usually adds a modest shop fee, bringing the total real-world repair cost higher than the bare part price alone.