TKR9054B – Rear Hubs and Bearing Spacers (+/-2mm, adj roll center, L/R, EB/NB48 2.1) TeknoTKR9054B Rear Hubs and Bearing Spacers (+ 2mm, adj roll center, L R, EB NB48 2. 1) Improve the handling of your Tekno RC EB NB48 2. X vehicles with these new + 2mm rear hubs! Our drivers discovered that the 2mm position (closest hole to the bearing) increased rear end grip, stability, and predictability on all track conditions during testing. Although these hubs include an optional high roll center setting (hinge pin further away from the bearing), it