|   Rock N Roller Multi-Cart Replacement Part Guide Frame Components Rear foldable side Front foldable side Rear- release cable Main frame bed Front- release cable       Spring-loaded wingbolts Front swivel caster Stairclimbers Rear pneumatic wheel Handle cotter pin: 1/8”x .75” Plastic endplug, 1” (25mm), 3/4” (20mm) Model Foldable Sides Spring-Loaded Wingbolts R2 25"/20" (front/rear) 3/8”x3/4”-16 threads/in. R6 24”/ Black or Red 3/8”x3/4”-16 threads/in. R8, R10, R12 32”/ Black or Red 3/8”x3/4”-16 threads/in. Note: 3/8”x3/4” wingbolts will not fit older carts manufactured in Italy. (Identified by a black main frame and red handles). Colors and specifications subject to change without notice   Replacement Wheels & Components  Axle Cotter Pin: 1/8”x 1.5” 0.5” pushnut Model Rear Wheel Hub Color Rear Axle Fastener R2 6"x1.50" soft tread, 3/8" bore Yellow 0.5” pushnut R6, R8 8"x2.5" pneumatic or No-Flat, 20mm bore Yellow or Red 1.5"x1/8" cotter key R10 10"x3.0" pneumatic or No-Flat, 20mm bore Yellow or Red 1.5"x1/8" cotter key R12 10"x3.0" pneumatic or No-Flat, 20mm bore Yellow 1.5"x1/8" cotter key Note: Models R6, R8, R10, and R12 use a 20mm tube axle. Old models with 5/8” diameter solid axle will NOT fit these wheels. Models designated with “RR” such as “RR10” are older models. 5/8” axle wheels are now available with No-Flat tires. Note: If valve stem retracts back into hub: Deflate tube completely. Firmly pinch tube and tire together with one hand while grabbing hub with other hand. Turn hub in appropriate direction until valve stem pops completely back through hole. Reinflate tire to 30 psi. Check pressure approximately every 3 months. NO-FLAT TIRES: are foam filled, giving a pneumatic-like ride requiring no air. Replacement Casters & Components Model