Name: Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS
Brand: Shimano
SKU: EBBUN300C23X
Price: 18.0 USD
Availability: InStock

Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS

$18.00

Shipping calculated at checkout.

Free Domestic shipping

In stock, ready to ship
Backordered, shipping soon

Shimano BB-UN300 Square Spindle Bottom Brackets

Fits JIS square-taper cranksets

Crankarm fixing bolts sold separately

Hollow spindle

Bottom Bracket Shell I.D.	1.37
BB/Frame Interface	English
BB Shell Width (mm)	73
Spindle Interface Type	Square Taper JIS
Spindle Length	123
Defined Color	Black

Shipping Policy

Components:

All component items (wheels, drivetrains, suspension, brakes, etc.) ship within 1–4 business days of purchase.

Bicycles:

Complete bikes typically ship within 2–3 weeks due to build, tuning, and inspection times. You will receive tracking information as soon as your order is ready to ship.

Riding Gear & Apparel:

Riding gear and apparel orders (helmets, jerseys, gloves, etc.) ship within 1–3 business days.

Returns & Exchanges:

If you received the wrong size or wish to exchange an item, it must be returned in original condition—unused, uninstalled, and with all packaging intact.

For full details, please see our Refund Policy before initiating a return.

[{"id":51194197770560,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"EBBUN300C23X","requires_shipping":true,"taxable":true,"featured_image":{"id":51498769121600,"product_id":9948900262208,"position":1,"created_at":"2025-10-23T10:54:03-07:00","updated_at":"2025-10-23T10:54:04-07:00","alt":"Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS","width":900,"height":269,"src":"\/\/spokex.com\/cdn\/shop\/files\/CR3488.jpg?v=1761242044","variant_ids":[51194197770560]},"available":true,"name":"Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS","public_title":null,"options":["Default Title"],"price":1800,"weight":318,"compare_at_price":1800,"inventory_management":"shopify","barcode":"192790622194","featured_media":{"alt":"Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS","id":41428008436032,"position":1,"preview_image":{"aspect_ratio":3.346,"height":269,"width":900,"src":"\/\/spokex.com\/cdn\/shop\/files\/CR3488.jpg?v=1761242044"}},"requires_selling_plan":false,"selling_plan_allocations":[]}]

{"id":51194197770560,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"EBBUN300C23X","requires_shipping":true,"taxable":true,"featured_image":{"id":51498769121600,"product_id":9948900262208,"position":1,"created_at":"2025-10-23T10:54:03-07:00","updated_at":"2025-10-23T10:54:04-07:00","alt":"Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS","width":900,"height":269,"src":"\/\/spokex.com\/cdn\/shop\/files\/CR3488.jpg?v=1761242044","variant_ids":[51194197770560]},"available":true,"name":"Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS","public_title":null,"options":["Default Title"],"price":1800,"weight":318,"compare_at_price":1800,"inventory_management":"shopify","barcode":"192790622194","featured_media":{"alt":"Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS","id":41428008436032,"position":1,"preview_image":{"aspect_ratio":3.346,"height":269,"width":900,"src":"\/\/spokex.com\/cdn\/shop\/files\/CR3488.jpg?v=1761242044"}},"requires_selling_plan":false,"selling_plan_allocations":[]}

Built with care

Ready for Adventure 🚴‍♂️

Every bike that leaves our shop is more than just a machine—it’s a promise of quality. From the moment you choose your ride, our expert team gets to work, hand-building and prepping each bike with precision. We meticulously inspect every component, fine-tune the details, and run thorough safety checks to ensure everything is dialed in perfectly. Because when you hit the road or trail, you deserve a bike that’s ready for anything.

Ride with confidence—crafted by us, powered by you. 🌟

Passion drives us

At SpokeX Bike Co., bikes aren't just our business — they’re our way of life. As a rider-owned and operated shop, every decision we make comes from firsthand experience on the trail, at the race, and on the open road. We know what it’s like to chase a new line, push through the pain cave, and celebrate the ride — because we live it every day.

Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS

Shipping Policy

You may also like

Recently viewed

Customer Reviews