stock front +12 rear what size chain should i buy 120 or 130??????

 

Depends on what your stock chain length is...extra link for every 2 teeth..so 6 links would be needed on a 12 up

 

120 link is plenty... you'll probably cut 4 or 5 off.

 

i think thats how many i cut off my last chain and that was only a +6

 

Well... when I put on a 52t I had to cut off about 7 or 8 links... and on a 56t I cut off about 5.

Since you only said +12 I have no idea how many teeth that is.

A 120 usually does the job w/ links to spare.... on anything reasonably sized.