Fastener type Belt thickness Min. pulley Max. belt strength > (recommended) (max. belt tension) Rivet / meter Miniprestol up - 2 mm 20 mm > (30 mm) 130 N/mm > (5 to 8 N/mm) 240 Prestol up - 3 mm 25 mm > (40 mm) 150 N/mm > (8 to 12 N/mm) 200 Minibelt 2 - 4 mm 30 mm > (60 mm) 200 N/mm > (12 to 20 N/mm) 160 G2 2 - 4 mm 30 mm > (60 mm) 200 N/mm > (12 to 20 N/mm) 160 Airport 3 - 6 mm 35 mm > (70 mm) 300 N/mm > (15 to 25 N/mm) 160 G4 3 - 6 mm 35 mm > (70 mm) 350 N/mm > (15 to 25 N/mm) 160 Gemini 3 - 7 mm 60 mm > (120 mm) 400 N/mm > (20 to 40 N/mm) 160 A 5 - 7 mm 75 mm > (120 mm) 400 N/mm > (20 to 40 N/mm) 96 BR 6 - 11 mm 125 mm 630 N/mm > (32 to 64 N/mm) 76 BM 7 - 12 mm 125 mm 800 N/mm > (32 to 80 N/mm) 96 CR 8 - 14 mm 250 mm 800 N/mm > (40 to 80 N/mm) 76 CM 8 - 14 mm 250 mm 1,000 N/mm > (50 to 100 N/mm) 144 DM 9 - 16 mm 300 mm 1,000 N/mm > (50 to 100 N/mm) 160 E 14 - 18 mm 400 mm 1,250 N/mm > (63 to 125 N/mm) 230 F 14 - 22 mm 550 mm 2,500 N/mm > (125 to 250 N/mm) 230 G 14 - 30 mm 750 mm 3,500 N/mm > (200 to 350 N/mm) 230 >