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Which belt? There are thre of them.
The Yardman Series push mower uses a 21 inch blade.
Size of the blade drive belt on a kgro lt4218
De412
43
70 inch
Z-180 3k
RP126520X Mower V-BeltRP138255 Drive Belt
3/8 x 33.1"
Please reask question with a model and engine size.
Gates
What engine size? Model? Etc?