Base Rims with 245 front, 275 rear tires and spacers.
 

Will the base Rims with 245 front, 275 rear size tires and 20mm front and 25mm rear spacers rub?

I know nothing will rub barring the spacers, but not sure otherwise.

Thanks in advance.

If your not lowered maybe not. 20 mm all around will not.

I am lowered, on Swifts.

If you search you will see its been done by many and it won't rub.

I run 25 up front, 20 in the back an lowered on swifts with absolutely no rubbing issues.