Whirlwind rear tire = unobtanium?

#1
I’ve been searching for a rear street type tire for our Ken Bar Whirlwind bike. 15-5.50x6 Cheng Shin was on it, I believe, since it’s 1998 build year.
I’ve contacted the following with no success:
OldMiniBikes warehouse
Coker, has the knobby, they said not so good for pavement riding.
DE Miller
Dennis Kirk Racing
Comet Kart Sales
Northern Tool
Waiting on a return call from Cheng Shin USA
The readily available 15-6x6 are too wide and interfere with the sprocket. No room to add a spacer with the welded to the wheel band brake drum.
The wheel is 5” wide.
Thoughts?
Thanks in advance,
Steve
 
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