a 180/55 on a 5" rim? they r truly stupid... i can't believe the tire manufacturer doesn't tell them 'u need to put this tire on a 5.5" rim'... no tire manufacturer will recommend a 180/55 on a 5" rim...
Sorry Matt, but that's exactly what Dunflop recommends for the D407 in 180/55 size. See attachment.
The stock rear rim on the SERG is 5.0 x 18, per H-D and Dunflop. Dunlop and Metzeler both recommend a 6.0 minimum for a 200 series tire. In case anyone is measuring their rim and coming up with 5.5, you have to measure the
inside width of the opening, not the outer edges.
Jerry
PS. Any tire engineer worth his salt will tell you not to install a tire on an incorrect width rim, and also not to mix different types (bias and radial, for instance). As I've mentioned before on this subject, do this mod at your own risk.