At Tyres.co.uk, tyre options for BMW 1M include Michelin Pilot Sport 4 S and Pirelli P Zero in the OEM staggered front size of 245/35 R19 93Y XL and rear size of 265/35 R19 98Y XL. BMW 1M does not come with OEM run-flat tyres, so the XL construction and Y speed rating must be retained.
The BMW 1M tyre size details can be found on the driver's side B-pillar tyre-inflation placard. The placard is visible when the driver's side door is open. The driver's handbook has the same information regarding the approved wheel and tyre details, while the sidewall of the tyre shows the size of the tyre fitted at the moment.
If the other tyres are still roadworthy, all four tyres do not need to be replaced on the BMW 1M but, where possible, replace tyres in matched pairs per axle. BMW 1Ms are only rear-wheel drive, and there are no xDrive versions, so four matching tyres are not required; for the UK, when two new tyres are fitted, the safety guidance recommends placing them on the rear axle.