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My DIY Wheel Cribs

GTP

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Wheel_Crib ISO.png


Here is my take on DIY wheels cribs. This design variation has a few advantages.
  1. Stackable storage
  2. The smaller footprint provides a slightly lighter crib.
  3. The smaller footprint makes efficient use of 13 pieces of 8-foot 2x4s, and that allows for a wider crib, with longer top.
  4. Vertical load is closer to the stack of 2x4 frames, i.e. a lower bending load on the 2x4s

I do my own string alignments now with the Caliper Garage setup.

I just got in a Quickjack 7000TL, and so I thought that wheel cribs can help me with alignments. The cribs allow me to keep the wheels on while I raise the car on the QJ, and then do any alignment adjustments. Then I can quickly lower the car and roll it fore and aft before re-checking the string alignment numbers.

I reviewed some of the designs on 6g and watched a few YouTube videos. I decided to improve the common design as described here.


First I measured the needed overall span for the tires on top of the crib. 20.5" for the Mustang, and 22" for the Explorer. This dictates the overall front/back length of the crib. The small footprint allowed me to up-size the top to 24", and so the end blocks won't pinch against the tires.
Top_Span_20230516_173914.jpg



Then I wanted to know the true footprint length for the tire - less than 7". This is to get an idea of exactly where the vertical load occurs.
Footprint_20230516_174039.jpg


Next I checked just how high my QJ can lift the tires off the floor. Over 12" for the front. (Same as for most DIY crib designs.)
20230516_175009.jpg


But only 11" for the rear tires (even though the latest QJ models raise cars an extra 3"). That's a problem for a 12" tall crib, but fortunately there is enough clearance for the 3" rubber block. This means that a pair of 3" blocks for the rear pinch weld contacts will get me above 12".
20230516_175045.jpg


And here is the cut plan.

Wheel_Crib_Cut_Plan_Layout.png


(Cut_Plan also attached as black-and-white PDF for printing.)
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GTP

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Finished product, stacked for storage. I made the top pieces 24.25" for a little wiggle room with the stands.
20230522_153335.jpg


At build completion in friends wood shop.
20230521_152234.jpg


We used wood glue and a nail gun.
20230521_130937.jpg


Simple way to get the first layer square.
20230521_130918.jpg
 

mavisky

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Going to have to copy this. Was about to jump into developing a set myself, but appreciate you doing the work for me LOL.
 

Johnny Rockit

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Pretty obvious that you avoided HD Premium lumber. Those are pretty sweet.
 

1 old racer

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I love it when car guys do things like this. Great job.
 
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Prodigal

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Nice design. Help me out here, how many of each length required total?
 
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GTP

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Buy 13 boards at the store and you will have one-half of one left over.

I updated the Cut Plan in post# 1, showing the 3 top boards stretched by 1/4" (for stacking).
 
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Tucker80

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These look great! Nice work
 

Jackismydog

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Stupid question:

I just did 2 wheel cribs this week end to check as I do not have quickjack but a regular jack. So I cannot get 12 inches of wheel clearance without compressing the suspension. I measured and have only 6 inches from ground to the bottom of the wheel. But the suspension is open at full length.

As I do not want to create any damage to the suspension, is there a safe way to elevate the wheels ? maybe using the jack? If this is the way, where should i install it ?
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