Guys go with the MT21s they transformed my Ten, really wouldnt change for anything else now
also had them on my R and BMW 800GS all of which went offroad really well

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My 5th XT660R Mods so far, K+N, Kev Mod, Yamaha Hand guards, Engine bars, Yam Sump guard, Yam Rack, Heated Grips, MT21s, Raised rear XTX dogbones, Front Raised with spacers, Extended Side Stand, Yam Touring Screen, Carbon fibre heel guards, CNC Short Levers, Snorkle Removed, 100W headlight bulbs, Rear pannier rack as rear crash bar CCC oval Cans, Zumo 660 +++