3 Dyson DC17 Vacuum Belts - Replaces Dyson DC17 Part 911710-01 (91171001) Package of (3) Replacement Dyson DC17 Belts. Replaces Dyson part numbers 911710-01 and 11710-01-01. 8mm wide belt. Fits all Dyson DC17 models that use the 8mm wide belt. Replace every 6 to 12 months to ensure optimum performance.