ZCP tires pressure?

[sapote]

I have ZCP wheels with 265/30ZR19 and 235/35ZR19. I couldn't find the tires inflation pressure in the User Manual which only lists for standard M3 tire sizes. Where to find the spec?

Thanks

[Obioban]

The ZCP used the same tire sizes as other M3s on 19s. You're running CSL sizes, so you could look them up... but pilot cups use pretty weird pressures, so they won't really apply to whatever tire you're actually running. Further, by the time the ZCP existed, BMW's lawyers were dictating the pressures BMW listed. Early in e46 production they gave pressure specs for daily use and for fully laden. 99% of the time, daily use spec was correct. By the end of e46 production they only listed the fully loaded car pressure spec, which is worse if you're not.

I'd say if you want to run the "factory" spec, best to find an early e46 M3 and run whatever the unladen 19" tire pressure spec was... even though you're a size off that.

[kermmmit7]

33psi front, 38 psi rear for oem sizes

[Actuary]

33/36 works well for me on PSS’s

[jbfrancis3]

A couple sizes and [many] pressure ranges are discussed in this thread. I'm not its helpful lol but the variation is interesting: https://nam3forum.com/forums/forum/m...5-19-275-30-19

[sapote]

The ZCP used the same tire sizes as other M3s on 19s. You're running CSL sizes, so you could look them up... but pilot cups use pretty weird pressures, so they won't really apply to whatever tire you're actually running. Further, by the time the ZCP existed, BMW's lawyers were dictating the pressures BMW listed. Early in e46 production they gave pressure specs for daily use and for fully laden. 99% of the time, daily use spec was correct. By the end of e46 production they only listed the fully loaded car pressure spec, which is worse if you're not.

I'd say if you want to run the "factory" spec, best to find an early e46 M3 and run whatever the unladen 19" tire pressure spec was... even though you're a size off that.

As the tires are wider than stock size, I think it makes sense to lower the pressure by couple psi (using skinny bicycle tires with 60psi spec).

Curious why stock size use 33 front and 38 rear when front is heavier and has narrower tires than rear? I would think the opposite is true.