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Reviews over the
Shimano BB-UN300
4 / 5
Top product
Was able to replace the bottom bracket easily. Be careful when measuring the old bottom bracket though so you order the right one.
Pros & Cons
4 / 5
Excellent BB, unless you go swimming with it
Fitted this bottom bracket to my cross bike, an old Giant Terrago gravel conversion. Easy to fit and everything turns wonderfully smooth and quiet. Until I so needed to go through a flooded area in the dunes, with about 40cm of water, many tens of metres long. Within 5 minutes, the BB started creaking and squeaking considerably. Geert from customer service told me that this BB is fine for splashing water and mud and such, but submerging it in water for longer periods is not a good idea. Hollowtech, in turn, works better. In short, fat user fail from me. In the end Mantel was very accommodating with a voucher, and I learned something again.
Pros & Cons
4 / 5
Solid Shimano quality
Used as a replacement for a badly abused bottom bracket from the last century. Looks solid, good seal against dust, and the 110mm version weighs 266g. Not super light but still 86g lighter than the previous one, so there is progress. No problems with it so far, just works as expected.
Pros & Cons
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