Has anyone tried these traction bars out?? https://www.ebay.com/itm/175140285025

Calvert has patents.

So that means no you havent?

That is correct. I have used the real ones for 20 years and the ones you linked look and probably function exactly the same. But, do they have the same quality rod ends and tubing? Don't know.

In my first response I was suggesting that they may not be available for long.

Made in China and company has lousy feedback. When it comes to suspension I want quality and safe parts. Your life depends on it.

Think about what is important, saving a few dollars or your life
I like ladder bars and four link now
I have helped NHRA Stock class racers set world class records with leaf springs only before John Calvert and another Father and Son team from Lancaster, CA were both developing that system and the same time.
John ended up making his company to sell those bars while he continued to work full time for the U.S. Government

I can’t see where they would be so life threatening, they push the heim joints and they are or could be the weak link. Are the welds good? If not 1/4” steel that would be the only other problem. Basically the Chinese could make them identical to Calverts but pay the guy making them $2.50 to sell them that cheap and still make a tidy profit. The Chinese have good machinery they just don’t have to pay union wages

If the front mount, or the front heim breaks, and the front of the bar drops down, you have an incredibly dangerous scenario. Is that any more likely than a real caltrac setup? I don’t know.

$ 265 or $389, 124$ difference, NO WAY would I get the cheaper copies

The company is out of Texas. They build to order.

NO offense meant to you but peoples thinking on the "cheaper" chinese product is exactly what has gotten this country in a position the be dependent on them. Now consider their ties to Russia and the current situation

And should any part of that system break during launch or hard acceleration you now have a siutuion where the vehicle may unexpectedly make a hard right or left

The Ebay info say

Location China

The extra money for the Calvert's would be well worth the great support.

Location of SELLER is China, per SELLER information, though to be honest I doubt they are selling US made product from a China location. The actual AD itself says NJ. Not sure where TX came into play.

THIS /\ I've had a set for years. The help they gave setting them up was invaluable. Also, I ordered the wrong size eye bushing, my fault. They sent me the right ones for free.

For a streetcar i think it will be ok, i will find out.

Not cracking wise, but if it's a street car, save even more and get a cheap pair of Lakewood bolt on slapper bars. They will work just as well.

The front eye of spring is still attached in same place, no where to go but bars still being attached on other side would give a dangerous ride. If bubble gum welds be wary. Both heims and tube are in compression, not stretching, solid joints would work fine. The two areas of my concern are the struts on u-bolt plate and the tube in front that pulls down on spring.

We made our own after a friend bought a set. Really the only thing we copied directly was the pivot. It's pretty easy to make the rest with tubing, spacers, flat stock and heim ends. We have less than $100 in materials in them.

I do have Calvert split mono springs and, up to last year ran their single adjustable shock.

It's not rocket science. Lots of other products out there with their own take on this. The Assassin bars are just one example.

They do work well as we've been 1.36 60 ft. with a 275 drag radial and 3,700 lbs. street car.

Pics of us putting them together...