Make sure vehicle is level and has no sag in the center of frame or body
Main Loop Location & Width
For appearance try to align main loop with door b-pillar or window seam. Main loop location could vary depending on drivers height,
plus check with your sactioning body or track officals for any specific rules. The mounting locations should be cleaned free of any
paint or glue, sound deadners or rust. Repair any frames, rocker panels, pinchwelds or floorboards that are
damaged or that have major rust areas.
Mounting to Floorboard
Measure from Driver to Passenger side of the floorboard to determine Main Loop width
Mounting to Frame Rails
Measure from outside of Frame Rail to Frame Rail to determine Main Loop width
Mounting to Pinchwelds
Measure from inside of Pinchweld to Pinchweld to Main Loop width
Allow room to weld outside of Main Loop to Mounting Surface
Once your Main Loop location has been determine mark the floorboard, frame rail
or pinchweld area on both sides of the vehicle
Make sure mark is the back side location of Main Loop.
Then lay a straight edge on both marks (make sure there square)
Drop a plum bob from the roof to the straight edge and mark
roof on both sides (driver and passenger side) and in the center.
Make sure your roof marks are align with the main loop marks
These marks top and bottom are the back side of the roll cage
Overall Main Loop Height & Door Height
Measure from your straight edge located on the floorboard, frame rails or pinchweld mounting surfaces
to the roof on all three roof loop marks to help you determine the overall height of the main loop.
Then measure from straight edge to the top of door to determine first bend location
of the main loop. After this measure from the top of the door to roof to determine
this height.
Roof Loop Width
Measure
from driver to passenger side of vehicle starting at your back roof loop marks
and from forward to check the width for any difference. Stop when you are 1" from from the
top of the windshield roof lip.
Inform us if you plan on keeping roof stiffners.
Roof Loop Length
Measure 1" back of the windshield roof lip from both driver and passenger side where the
vehicle a-post and roof line meet. Then mark in three spots in between your original
two marks at the a-post and roof line. Make sure all marks are inline with each other.
Then measure from windshield marks to your back main loop marks on the roof.
This wil determine the length of the roof loop.
*Note some roofs have front stiffner located behind the top windshield
lip
You may have to trim some out if your rules permit.
Windshield Post Location
Once door height has been determined from your main loop & door height measurements,
Drop a plum bob from the outside edge of the vehicle a-post and subtract 2" from your door height measurement.
Example if your top door height is 19" from the pinchweld main loop mounting surface then measure 17" from the
bottom of your plum bob and mark the string. Take the 17" mark and follow downward along the a-post until the
plum bob touches your straight edge located at pinchweld from the driver to passenger sides.
Make sure your straight edge is square from the main loop b-pillar marks.
Mark the vehicle a-post
and mounting surface where the plum bob touches.
From the a-post mark measure to the 1" mark located at the roof windshield lip.
These two measurements will help to determine the overall length of the windshield post
The mounting surface mark is the outside point of the windshield post, this will help in
determining the windshield post angle and door bar length.
At your 1" marks located at the windshield roof lip, drop the plum bob straight down until it
touches your straight edge, do this on both sides (driver and passenger) and make sure your straight edge is
square from the main loop b-pillar marks, then mark the mounting surface
When dropping your plum bob to get this mark measure the length of plum bob to determine height from
mounting surface to the 1" mark behind windshield lip.
Then measure from forward windshield post mark (example 17" mark) to the second mark you just made
from 1" mark located behind windshield lip.
This will help in determining the windshield post angle.
Door Bar Length
Measure from the forward windshield post mark to main loop mark located at the b-pillar
Note some 2 or 4 door Vehicles will have to the b-pillar trimmed to fit the door bars.
Some doors require different roll cage door bar radius to fit inside the door skin.
We offer these different radius:
3"
4"
5"
6"
7"
Take this into consideration when you arrive at your main loop width then measure
the door skin radius to achieve the tightest fit possible.
