[Formulabruce]

" Delrin" is the name of a type of plastic. Seems it is used in Del A Lum. But Del a Lum is the Brand Global West invented it seems.
If anyone wants to use a bigger tire with " No" sidewall, this is the ticket because it allows springs and shocks to absorb what the side walls can't, and at a very fast strut like performance.
The ride difference is huge. Old rubber seized bushings have about 2 in of twisting travel, the new ones about 4.5" of smooth as she goes.