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Shimano UN54/UN26 Left Plastic Cup

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4.0 out of 5 (2 ratings)
2 customer reviews



> Bottom Brackets

  • Shimano square spindle parts
  • Left plastic bottom bracket cup for 68mm x 113 E-Type bottom bracket
Shipping Offers - $2.99 Pick-a-Product Shipping, and Free Shipping on orders over $150

Cup (Plastic)

Item #:43158-100251 
Mfg#:Y1SG05030 
UPC:689228164482 
EAN:689228164482 
Other #s:
CR5072 
Available to ship DETAILS
Oregon2 - Apr 21st47 - Apr 23rd
Minnesota2 - Apr 21st 
New Mexico1 - Apr 21st 
Utah10 - Apr 21st 

pickup_biking_man Available for pickup DETAILS
Portland, OR2 Apr 20th47 - Apr 23rd
Ogden, UT0 - Apr 21st10 - Apr 22nd
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13 - Apr 23rd
15 - Apr 24th
47 - Apr 25th

$5.00

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Customer Ratings

Current Customer Rating


4.0 out of 5 (2 ratings)

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Customer Reviews

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It will crack if you over tighten it

But it's $5 and made of plastic, so if you over-tighten it, that's kinda on you. You also need to be careful that your BB tool is seated properly as it will slip off easily and wear down the plastic around the contact points.

Pros: Cheap, more give than metal

Cons: Not as durable as metal

Would Buy Again: Yes
Would Recommend: Yes

Reviewed on: May 03, 2013
Reviewed by: Tiernan A.

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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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