It did not fit my BS250S-11B the diameter of the bearings is 8 mm in me the pin is 12 mm. After removing the bearings and gluing in their place everything works as expected.
Aprilia Caponord ETV 1000. before installation I grabbed the roller in 2 fingers in the place of the mounting bolt, after turning the roller, it could be strongly felt that the fingers were pitching sideways, that is, the bearings were badly fitted, so there was a problem with the insertion of the bolt, and after fitting into the Moto and screwing with the bolt in one place it cuts when rotating.
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Reliable opinion
UFO - Motorcycle chain tensioner rollers to the most popular motorcycles