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Home > Bottom Brackets > Product Details

Shimano UN54/UN26 Left Plastic Cup

4.0 Stars 1 Review

Cup (Plastic)

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Shimano UN54/UN26 Left Plastic Cup
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4.0 out of 5 (2 ratings)

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Contrary to what you might think, the plastic cup is actually better at supporting the bottom bracket cartridge unit than the alloy cup, because the plastic allows for some compression past the point of contact. It also makes it easier to install on older bikes where the BB threads might not be pristine.

Be gentle while installing, and back it off if the bearing gets too stiff: this cup also serves as the bearing adjustment, and will stay put even if it's not fully flush with the BB shell. It will crack if over-torqued during installation, but this is why replacements are $5. It is also marginally reusable, use your best judgement.

Would Buy Again: Yes
Would Recommend: Yes

Reviewed on: January 16, 2012
Reviewed by: DL

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