[NorthGeorgia]

Have had no issue mixing same brand front with different brand rear - but it depends on the application --

For street - generally advisable to keep same tire brand front and rear - if for any reason - the OE tires are typically engineered and optimized for the platform's weight and performance envelope with consideration for compliance, noise, weather, etc. under normal to spirited driving.

For example - was not aware that the tread compound on a Michelin MP4S or SS differs from platform to platform -- for the cambered M3/M4 (F8X) - the OE tire model # has tougher tread on the inner side wall and softer as it approaches the outside. Who knew?

So - what I drive on the street is different than what I track especially if the kids or wife may have the keys. Just ran a combo of MP4S rear with MPSS fronts - similar other than wear rates.

For track - after thousands and thousands of road course track miles and looking at lots of data (g-loads, corner speeds, heat, times, etc) -- for HPDE track lapping or practice where tires only last <6 days - I use what I have and do not have issues mixing tire brands (same brand front- different brand rear). The current crop of DOT legal R compound and <200 TW tires are really good.

- but I know the track, and have good feel for the handling characteristics of each platform at the limit given the weather, tire type and tire age (heat cycles) as it relates to understeer, oversteer, and grip (braking, cornering and exit).

For this level of lapping or practice (mainly track familiarity before a race) running at 7-8/10's - I will mix but try to keep grip (tread wear) and speed ratings similar front to rear and generally like more grip in the rear.

For example, in the dry, Nankang AR1 fronts (100TW) with G3R rears (100TW) work fine. CUP2 (180) fronts with G3R (100) will induce some push at the limits - all like heat in them from 120F-185F which is surprisingly hard to do in cooler temps.

Different approach if driving 10/10's+ chasing a track record or racing where dollars are invested in travel, hotel, car prep and track time, I will normally use as fresh and fast as the budget allows.....

Hope it helps ---

Recent tire experience and how I group them

Track/Dry* [G3R, RR, R7, A7, AR1, MSC2]
Track Enduro/Damp* [AO52, RT660, G3, RS4]
Street/Light Track/Wet [MP4S, MPSS, Apex V601]