most trials wheelset aren't sold complete,but in parts.this is mainly due to trials riders grinding their rims often thus leading to rims wearing out quicker than the rest of the wheel,so most riders replace the rims often. for stock front wheels most people will use a hope pro 2 laced to a try'all front rim,and for the rear a pro 2 trials (if they not running a ffw) onto say a echo rim.these are only example mind. rear rims for trials bikes tend to be 38mm + to ensure a large tire profile. hope i've helped,steve