Often items such as foam inserts are, along some lines, a compromise. Too hard and your scaler won’t have much traction as the tire won’t be able to flex and contort. Too soft and it will flex too much and side hilling will suffer. Medium inserts or memory foam inserts might be a great anser, but they are often a compromise. That’s where dual stage inserts come in. Boom Racing has a new 1.9 set. These are sold in pairs and have soft, open-cell pouter rings paired with a firm closed-cell inner ring.
The foams are perfect for 4.75 in. tall 1.9 tires.
Learn more here.