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A pro-built tuning set of 5-hole Fat Boys pistons, sold as 4 pair. The set includes 8 pistons: four 2.2mm and four 2.7mm, and all have 5 x 1.4mm fronts and 5 x 1.5mm rears. Nothing is pre-drilled. The 2.2mm pistons suit low-grip, bumpy tracks, and the 2.7mm pistons give more packing on smooth tracks. Mix and match them for your surface. 4 pistons: Fat Boys 2.2mm, flat front and beveled rear 4 pistons: Fat Boys 2.7mm, flat front and beveled rear Precision CNC routed Delrin, hand marked with hole diameters. Reduced clearance cuts blow-by on landings and reduces suspension flutter. Hot weather: Front: 42.5wt AE, 4 x 1.4mm and 1 x 1.5mm Rear: 35wt AE, 3 x 1.50mm and 2 x 1.70mm (for the third-hole wide RC8B4.1 arm) Cold weather (below 60F): Front: 40wt AE (500 CST), 4 x 1.4mm and 1 x 1.5mm Rear: 32.5wt AE (500 CST), 3 x 1.50mm and 2 x 1.70mm (for the third-hole wide RC8B4.1 arm) Fits electric and nitro Associated RC8B4.1 and RC8T4, and older versions, as well as Mugen MBX8 and MBX8T series and XRAY XB9 buggy series. A good set for tuning both nitro and electric buggies.
