Right, most hubs are sealed bearing but that means f**k all, chris kings are sealed bearing but they are not the same as a t-master hub, reason being t-master hub has a fixed sprocket and it engage's up-front from the freewheel, where as the chris kings has freehub which engage's from the hub its self and that runs a fixed cog on the crank arm. As for what parts, if you have just brought a standard bike, for example a t-pro. Firstly you will might want to change your backwheel and get a sealed bearing hub on a stronger rim, bars and stem to make it ride nicer and brake pads for better braking performance. As for this whole saving weight thing, in my eyes the weight of your bike means nothing, trials is all about power so if you dont have the power then you have to have a light bike but the majority of the time people do have the power. Dan.