Tire options for 21" rear? (650i GC)

[itzjoker]

Got some 21's on the way and there aren't many options for the rear other than 295/25/21 with Michelin 4S...too pricey for my use and overkill imo.

I have a little more options going 275/30/21 (8.75mm arch gap loss compared to 295/25/21). Stock rear height I should be okay. Will I run into any issues if lowering the rear? Currently only lowered the front and am satisfied...still haven't gotten to the rear yet.


This car is my daily driver, RWD, and Stage 2 with occasional drag strip use in the summer so I would like an affordable tire that can hook.

265/30/21 may not have enough meat for traction
Will 305/25/21 even fit on 650i?

Any suggestions will be appreciated!
Thanks all!