I was wondering if a 130/70V R18 would fit my 1990

Contact any local tire shop on this or go online and look it up at the tirerack.com

shifter cable

Your talking about your brake pedal right? Should be under the pedal.

Front: 110/70R17 54H Rear: 140/60R18 64H

Front 225/40 R18 Rear 255/35 R18 Front Rim Size 7.5x18 Rear Rim Size 8.5x18

18" with XXX/50/r18 tire any larger and you will have to roll the fenders or purchase a lift kit

The front hubs have the same part number, but the rims are a little different the 1989 is 1.6 inches wide and the 1990 is 1.85 wide. The only problem may be a clearance issue with the width of the rim, other than that it will fit.

as the alternator IS the adjuster for the tension of the belt,it is a simple task of undoing the alternator bolts/nuts and pushing it inwards to fit belt,then pull it outward to tension belt to correct tension...

Take your Alero to any reputable tire dealer and they will assist you in hopes of selling you something. Just tell them you want an estimate and that you want to be sure you won't have a rubbing problem with this change.