First I’ve heard of that and I know of no one that had to do that at any ET swapping from emptee bubbas to the C1550.

Having ZERO faith in the return of inventory anytime soon, I found a set of 29.5x10.5-15 Hoosier DBR's in stock and snatched them.
We'll have a chance to do a direct product comparison on the same combo, I hope. According to legend, I'll be hard pressed to wear out the tires I have on it right now by the season end.
We shall see. I'm about 50 runs into these PBR Mickeys. Love 'em.

I'm gonna run this season on my Mickeys, then switching to Hoosier next time around. They work but I'm getting tired of airing them up all the time. A few of the FAST 16/TD racers here are switching and doing well with the Hoosiers....

Is the C1550 Hoosiers version of the 3195/3197? If not, which one is?

Yes, but they don’t chunk, hold air and are quicker