I was wanting to install a set of aftermarket rims on the bike. the rear is the same but the front is a 21 inch. Was told that the wheels will show differnt speeds when trying to stop- mainly the front 21 inch, and it could cause a system fault light or cause a unsafe ride when braking, causing the front abs to kick in and out. I didnt know if the abs was on a differnt computer or on the delfi computer.