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Boom Racing Rock Monster Foam Insert

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We are excited to introduce our latest insert for crawling tires: the Rock Monster™ foam insert lineup!

The Rock Monster™ foam insert lineup just got bigger.
 
New 1.9" 90x20mm and 88x27mm sizes are now available for narrow scale tire setups.
90x20mm fits:
  • 1.9" Mileage Classic 3.82"x1.0" (97x26mm)
  • 1.9" SP Road Tracker 3.82"x0.94" (97x24mm)
  • 1.9" Trophy Classic Scale Crawler Tire 3.82"x1.0" (97x26mm)
  • 1.9" Landy Classic Gekko 3.82"x1.0" (97x27mm)
  • 1.9" Expedition Classic 3.86"x1.0" (98x26mm)
88x27mm fits:
  • 1.9" MAXGRAPPLER 3.82"x1.26" (97x32mm)
  • 1.9" TPD 3.82"x1.3" (97x33mm)
The 90x20mm size is available in three foam densities for different terrains, vehicle weights, and driving styles:
  • Black = Medium
  • Blue = Soft
  • Green = Super Soft
Designed to improve tire support, sidewall stability, and overall trail performance while maintaining realistic tire deformation.
 
Product details:
https://www.boomracing.com/index.php?route=product/search&search=rock%20monster%20foam%20inserts
 

 

 

 


Author:Joel Berones

Published Date:16 May 2026

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