Image forming apparatus and image forming system

An image forming system comprising:

• a first image forming apparatus including
• a first stacking portion configured to stack a first recording medium,
• a feeding rotatable member configured to feed the first feeding medium,
• an arithmetic portion configured to obtain a degree of deterioration of said feeding rotatable member, and
• a setting portion configured to set so as to associate the other stacking portion with said first stacking portion;
• a second image forming apparatus different from said first image forming apparatus, said second image forming apparatus including
• a second stacking portion configured to stack a second recording medium, and
• a detecting portion configured to detect a characteristics of the second recording medium;
• and
• a network line configured to connect said first image forming apparatus and said second image forming apparatus,
• wherein when said second stacking portion is associated with said first stacking portion by said setting portion, said arithmetic portion acquires information related to the characteristic of the second recording medium detected by said detecting portion via said network line and obtains the degree of deterioration of said feeding rotatable member based on the acquired information related to the characteristic of the second recording medium.