i checked the search feature and some people said 21mm and some said 22mm. i looked in the owner's manual and it didn't say.

can anyone help?

thanks

 

I am pretty sure that they are 21 mm...

 

12MMx1.25"

 

Exactly! Bolt and nut sizes are determined by the thread diameter and thread pitch. FWIW, SAE threads (american) are designated by threads per inch; metric threads are designated by mm per thread.

However, the correct wrench size is 21mm.

 

yup 12x1.25. but i use a 13/16 wrench, no problems.