Although no fitting instructions were included with the wheels, it was relatively easy to find a video online showing which bolts to remove to replace the existing wheels. I have a Roomba 770 and they fit perfectly. They seem to be working well so far, but I can't comment on the durability of the wheels as I've recently replaced them. All in all it was great value for money as they were a lot cheaper than stock wheels than other wheels currently on the market and appear to work the same as the original wheels.
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