Paul,
Good talking to you today.  I checked our tech manual for recommended fitment
on your CBR1100XX and found that the rear should be a 180/55ZR17 Road Attack
"C" which was originally designed for BMW but does better on your CBR1100XX 
than the standard 180 rear Road Attack.  Please confirm by return if the previous 
rear Road Attacks that you were running were the standards or the "C" spec?

In accordance with our conversation I sent you a warranty replacement 180/55ZR17 
Road Attack "C".  Let me know how it does for you.

Safe Riding & Best Regards,
Greg Reich
Continental Tire North America, Inc.
Sales & Marketing Manager/Motorcycle Tires
7800 Liberty Church Rd.
Johnstown, Ohio 43031
Tel: 740-966-3106
Fax: 740-966-3107
E-Mail: greg.reich@conti-na.com
Website: www.conti-moto.com