I have a dr650 and just put 17" warp 9 sm wheels on there. I've lost a lot of top end going to the larger sprocket (think ots a 46 tooth)in the rear but don't know what sprocket to buy that will fit my wheels with the warp 9 hubs. I've got a similar commute and the highway is no longer my friend. Any ideas? Would going larger in the front sprocket solve my problem or should I go smaller in the rear and larger in the front? I usually order my parts from Procycle and they have package deals with both sprockets and a chain but I don't think they will be compatible with these wheels. Somebody help me out here. Please.