I would be terrified to nail the brakes hard on the spares. Those tires are not meant for high speeds and hard braking. If it were me, I'd buy new tires that have some grip and put them on the spare wheels.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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