It can be smart to measure your old spikes before you buy. Here you have some thread specifications:

 

M6 --> 6mm outher diameter --> 10 threads per cm.

M8 --> 8 mm outher diameter --> 8 threads per cm

M10 (NOT SUPPORTED) --> 10 mm outher diameter --> 6,67 threads per cm

M12 (NOT SUPPORTED) --> 12 mm outher diameter --> 5,7 threads per cm

1/4" --> 1/4 inch = app. 6,35 mm outher diameter --> 20 threads per inch = app. 7,8 threads per cm.

5/16" --> 5/16 inch = app. 7,94 mm outher diameter --> 18 threads per inch = app. 7,05 threads per cm.

3/8" (NOT SUPPORTED) --> 3/8 inch = app. 9,3 mm outher diameter --> 16 threads per inch = app. 6,45 threads per cm.

7/16" (NOT SUPPORTED) --> 7/16 inch = app. 10,1 mm outher diameter --> 14 threads per inch = app. 5,65 threads per cm.

1/2" (NOT SUPPORTED) --> 1/2 inch = app. 12,4 mm outher diameter --> 12 threads per inch = app. 4,85 threads per cm