I know we've done plenty of testing with our Vector chassis over the years on Burris tire.
No major manufacturers that I am aware of, do factory testing with Burris tires. With that said, however, the manufacturers do work with dealers/teams who are running their karts on Burris.
Two major differences:
1 - the track surfaces and amount of available bite (ie none) for local Saturday night type stuff in the midwest, and
2 - the floppy sidewall construction of the Burris 33 tire.
Most manufacturers currently offer a small tube kart, or thin wall, etc. that's softer and flexes more for low bite weekly racing.
Pick a brand that offers good support and stick with them.
Honestly, the Triton Jr that you're on is still one of the best junior and lightweight chassis out there, even though it's a bit dated.
I wouldn't be afraid to throw some new components at it and let'er fly against any of the newer stuff.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cut
z
www.CarlsonMotorsports.com
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32 years of service to the karting industry ~ 1Cor 9:24
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bcarlson@CarlsonMotorsports.com