Saving for information... but I'll start with information in regards to the 1.9 Pit Bulls:
Foam Recommendations are based on the RTR weight of your crawler. The heavier the crawler, the taller the inner you want to use.
For crawlers weighing 6 pounds RTR or less, using 1.9 Rock Beasts tires;
Front:
4.25" Closed Cell Inner
Front Outer = Soft (if used more for crawling)
or
Front Outer = Medium (if used more for trail riding / bashing)
Rear:
4.25" Closed Cell Inner
Rear Outer = Medium
or
Rear Outer = Firm (if used more for trail riding / bashing)
For crawlers weighing 7 pounds RTR or more, using 1.9 Rock Beasts tires;
Front:
4.50" Closed Cell Inner
Front Outer = Soft (if used more for crawling or lighter in weight)
or
Front Outer = Medium (if used more for trail riding / bashing or heavier in weight)
Rear:
4.50" Closed Cell Inner
Rear Outer = Medium
or
Rear Outer = Firm (if used more for trail riding / bashing or heavier in weight)
I would only recommend the 4.75" Closed Cell for use in a 1.9 Rock Beast if the crawler is extremely heavy, 10 pounds+
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