Use wheel clay or a wheel polish. Personally I would do a wheel clay.

I thought WD40 could be used for this but you'd be spraying it around rubber and that will make for some butt[puckering riding afterwards.

SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq NEW: 19 Goldwing Tour DCT