Correct foam width for CF MT tires?

[DAVEC-NITRO-RS4]

Trinity foams are slightly bigger than the Re foams.

I have used both and never trimmed either.

If Proline knew what they where doing theywould have made a better foam. I think they just have a cheap foam stock and throw it in with every tire.

You want to have a little extra side foam, this fills in the side way and it will be the first to break down, so the little extra compensates for the break down.

Just stuff it all in there. The CF's will mount up real nice in the wheels bead.

Not to really throw a wrench at you, plug the vent hole on the wheel with shoo goo or something similar and then get a leather punch and vent the tire on the inner side wall. 2 holes 180* apart from each other. This will prevent dirt and water from entering tire and break down your foams very early.

Being the sceptic/novice that I am, I emailed ProLine custmer support on this subject. Their promotions coordinator replied:

Dave,
Thank you for supporting Pro-Line/Protoform products. We recommend easing the edge slightly to help contour the foam. The foam is wider on purpose to help reduce sidewall flex.

Then I asked him about even wider Racers edge foams:

Dave,
It is not a bad thing as long as the foam does not bunch up in the tire. Usually the more foam the better, the biggest problem in monster truck tires is the sidewall and overall tire flex. Most racers try to eliminate as much side wall flex as possible by using as much foam as possible. Sometime back we use to use a full truck foam in the rear of our 1/10th buggy tires, it seemed to help the tire hold shape and have less flex when cornering.

So, bottom line, you guys were right AGAIN! When will I learn to listen? Probably never. So I did use the RE foams and just slightly eased the edges, especially the edge against the rim bead to make it a tiny bit easier on the sidewall glue edge. Dry fir them and all looks great. Used strapping tape inside for "belting" and am ready to glue them up. Still listening for the vented sidewall/tread answer to settle.

Thanks!