The 90q20v has 256mm (10") front rotors, and the CQ 20v has 276mm (10.9") front rotors. That is from the Bentley, and the 20v homepage. The CQ has the G60 brakes on it, whereas the 90q20v doesn't. That's why the 90q20v has 14" rims, and the CQ has 15" rims. 14" rims won't fit over a 276mm G60 twin piston setup. -Eric Ferguson '90 CQ 20v '87 5ksq