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Front Bumper Trimming:
 
Concept:
Trimming the bottom corner of the front bumper and moving the wheel well liner forward.
 
You may find the front tires rubbing on the front bumper and the wheel well fender liner after:
  • Installing larger tires where the overall diameter is larger than what came from the factory
  • Creating negative scrub radius in which the wheel is moved outboard of the steering centerline from either;
       • Adding wheel spacers for a more agressive look or to increase space between the tire and the upper control arm
       • Changing the wheels to ones with greater negative offset
  • Adding too much positive caster during a wheel alignment in order to alleviate rubbing on the body mount located on the rearward (mud flap side) of the tire
     
    In my case, I needed to trim when I first experienced rubbing when I installed Spidertrax Wheel Spacers which moved the wheels outward 31.75mm (1-1/4").
     
    I proactively trimmed some more when I moved the wheels slightly further outward, an additional 6.35mm (1/4") when removing these spacers and changing to TRD Pro Wheels.
     
    Moving the wheel well fender liner forward:
    Looking underneath the vehicle where the front bumper meets the fender flare, you will find 2 10mm screws on the driver side and 3 on the passenger side. With the steering wheel turned so the wheel is turned fully into the well you will clearly see where the rubbing occurs. The tire was pressed right against the plastic liner. Remove the 10mm screws mentioned above, remove the plastic nutsert, push the liner forward as much as possible, and drill a new hole in the liner. You can discard the nutsert you removed, install a larger washer (I used a homemade rubber washer) and reinstall the screws.
     


    Front driver side
    Tire rubbing on inner wheel well liner


    Front driver side
    Liner moved forward


    Front passenger side
    Tire rubbing on inner wheel well liner


    Front passenger side
    Liner moved forward


    Front passenger side
    Liner moved forward

     
    Trimming the front bumper bottom corner:
    Moving the plastic inner wheel well liner forward a few inches alievated tire rubbing there. But now I noticed that while backing up small inclines with the steering wheel turned moderately I have tire rub on the lower bumper corners at the point they curve into the wheel well.
     
    Using blue painters tape, mask off the area to be trimmed. This will provide a straight line to follow while cutting. I made the first cut using a cutoff wheel on a dremel tool and followed this up with a sanding drum for final finishing. The cut comes out quite nice and clean and you really cannot even tell that trimming was done. There is room left to do more trimming if necessary, such as going to an even larger tire size.
     


    Front driver side
    Before moving liner forward
    and before bumper trimming


    Front driver side
    Portion of bumper to be trimmed


    Front driver side
    After liner moved forward
    and trimming completed


    Front driver side
    After liner moved forward
    and trimming completed


    Front passenger side
    Tire rubbing on bumper
    The liner is already moved forward


    Front passenger side
    Liner moved forward only


    Front passenger side
    Area of bumper to trim


    Front passenger side
    Bumper Trimmed

     
    Second round of Trimming:
    I trimmed some more when I moved the wheels slightly further outward, an additional 6.35mm (1/4") when removing the Spidertrax Wheel Spacers and changing to TRD Pro Wheels with a perfect offset.


    Front driver side
    Additional Trimming
    Additional moving of liner forward


    Front driver side
    Additional Trimming
    Additional moving of liner forward


    Front driver side
    Additional Trimming
    Additional moving of liner forward


    Front passenger side
    Additional Trimming
    Additional moving of liner forward


    Front passenger side
    Additional Trimming
    Additional moving of liner forward


    Front passenger side
    Additional Trimming
    Additional moving of liner forward

     


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    Toyota 4Runner Topsites

     
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