8" Polyurethane Replacement Wheel for Trikke carving vehicles. Replacement wheel for the Trikke. ABEC 5 Bearings already installed Fits all T8 models EXCEPT the current version with disc brakes. The 8" poly is also an excellent upgrade to your T78 on the rear wheels. The 8" diameter wheel is faster and smoother. Fits all T78 models - requires the 13mm hub-to-frame spacers - INCLUDED with each wheel Fits most T67 models - requires the 13mm hub-to-frame spacers - INCLUDED with each wheel 13mm Spacers are included so you can upgrade your T78 wheels from 6" or 7" poly's.