Try a maxxis swampthing, comes in a sticky compound and is smaller than a 2.7 highroller and is also lighter too. Best 24" 'trials' tire out there for the rear, works well with a dmr moto up front. http://www.chainreactioncycles.com/Models.aspx?ModelID=11564 Maxxis, Tioga, DMR and Schwalbe all do good street bmxy style tires.