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I run Sparco RTT 524 (6j) with 195/50/15 R888's and they fit fine, R888's always seem to be wider than the stated width so you get a decent rim protection as well.
Ran some 185/55r14 kuhmo v70a on a 5.5x14 rim once (my 888's were 185/60r14 on a 6j rim) and they rolled on the rim so the sidewall was touching the track! Think they had a soft wall though