Chainwheel for multi-size crank modules

A chainwheel comprising:

• a chainwheel body being round and comprising
• a center point;
• and
• a periphery;
• multiple chain teeth arranged along the periphery of the chainwheel body;
• a first combining hole set formed through the chainwheel body and comprising multiple first combining holes that are formed through the chainwheel body, wherein
• each first combining hole has a center point;
• a first distance is defined between the center point of each first combining hole and the center point of the chainwheel body;
• and
• the first distances between the center points of the first combining holes and the center point of the chainwheel body are equal;
• and
• a second combining hole set formed through the chainwheel body and comprising multiple second combining holes that are formed through the chainwheel body, wherein
• each second combining hole has a center point;
• a second distance is defined between the center point of each second combining hole and the center point of the chainwheel body;
• the second distances between the center points of the second combining holes and the center point of the chainwheel body are equal;
• and
• the second distance is longer than the first distance.