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I have a 17" rear rim on the 86 GSXR1100 and am looking to get a 17" rim on the front too. In order to do that I have to swap the whole front end over. Now the bottom bearings on the triple are the same, but the top bearings are different. The 86 top bearing is a 25x47x15 and the 99 is a 30x55x17. Now would the bearing that I have to get be a 30x47x15?