Replaced Roomba 655 treads. Old treads are badly worn. The old chains are a little tricky to remove (requires a precise knife) but they stood up after the old ones came loose. The original protectors had small raised stabilizers to attach them to the rim, they don't have stabilizers but Roomba doesn't seem to mind. The steps held firmly on low and high pile carpet, wood and tile for about 15 runs. Much cheaper than changing the whole wheel. In general, very satisfied with the simplicity and the price.
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