squeeking tyres

[slipstream 1985]

Just took off the standard 18s and put on the csl 19s my mate had. However there is a consistant squeek very rubbery in sound comming from both fronts. The tyres had been sitting in his loft for 3 years (and will be gettin changed) Is it just the rubber reshapping after being sat so long. Its defo not catching on anything. I assume there are no spacers needed putting on the csl wheels to a standard m3?
edited to add presures at 30psi at the front

[AW10]

Probably just wearing off of the glaze/haze that builds up over time. One good hard stop from 60 should clean them off.

[Tony B2]

I would suggest that 30psi is way too low.