Front Wheel specifically designed for iRobot Roomba 500 and 600 Series 510, 520, 521, 530, 531, 532, 533, 534, 535, 536, 537, 540, 541, 545, 550, 551, 552, 555, 560, 561, 562, 563, 564, 565, 566, 570, 571, 572, 573, 577, 580, 581, 585, 587, 589, 590, 595, 599, 606, 610, 611, 612, 614, 615, 616, 618, 619, 620, 621, 625, 627, 630, 635, 637, 640, 643, 645, 650, 651, 652, 655, 660, 665, 667, 670, 671, 675, 676, 677, 680, 681, 685, 690, 691, 692, 693, 694, 695, 696, 697, 698. Compatible with All iRobot Roomba 700, 800, 900 Series 760, 761, 770, 780, 790, 801, 805, 850, 860, 870, 877, 880, 890, 891, 895, 960, 961, 980, 981, 985. Compatible with All iRobot Roomba e, i, & j Series e5(5150), e5(5134), e6(6198), i3(3150), i3+(3550), i4(4150), i4+(4552), i6, i6+(6550), i7(7150), i7+(7550), i8, i8+(8550), j7(7150), j7+(7550).