Combination of Old & New Rear/Front Tyres

[Bobby Dazzler]

I have Michelin: Here are the details:
Front: Michelin Pilot Sport 4 SUV 275/45 R21 at Blackcircles.com
Rear: Michelin Latitude Sport 3 315/40 R21 at Blackcircles.com
Since they are different sizes, I can't put the used ones in front as some have suggested.

Both tyres are MO1 (Designed for Mercedes).

Costco is selling https://www.costco.co.uk/Tyres-Auto...-R21-110-Y-PILOT-SPORT-4-SUV-XL/tire/p/984972

Its same as the front one, but it doens't mention MO1 status.

If I were to go ahead with replacing only problematic tyre, is it ok to have two same tyres, but one with MO1 status and other not?

MO1 are for AMG models specifically, and if my experience have softer compound (pick up grit), slightly stiffer sidewalls, and a squarer should profile than MO tyres.

I’d try to find a match for front and rear if you can. Running MO1 on one axle and a generic tyre on the other axle is unlikely to be dangerous but wouldn’t be ideal unless there is no alternative.

Given that you have large staggered wheels I suspect you have a 167 generation GLE so a current model, so I’d be surprised if the tyres fitted at the factory are not still widely available.