--- product_id: 231227897 title: "Square Type Bicycle Bottom Bracket - BSA 68MM, Spindle: 122.5MM - EBBUN300B22X" brand: "shimano" price: "£21.20" currency: GBP in_stock: true reviews_count: 13 category: "Shimano" url: https://www.desertcart.co.uk/products/231227897-square-type-bicycle-bottom-bracket-bsa-68mm-spindle-122-5mm store_origin: GB region: Great Britain --- # Fits JIS square-taper cranksets 122.5mm spindle length Sealed cartridge bearing for durability Square Type Bicycle Bottom Bracket - BSA 68MM, Spindle: 122.5MM - EBBUN300B22X **Brand:** shimano **Price:** £21.20 **Availability:** ✅ In Stock ## Summary > 🚴‍♂️ Ride tough, ride smart — Shimano’s bottom bracket keeps your grind smooth and steady! ## Quick Answers - **What is this?** Square Type Bicycle Bottom Bracket - BSA 68MM, Spindle: 122.5MM - EBBUN300B22X by shimano - **How much does it cost?** £21.20 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/231227897-square-type-bicycle-bottom-bracket-bsa-68mm-spindle-122-5mm) ## Best For - shimano enthusiasts ## Why This Product - Trusted shimano brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable Aluminum Adapter:** Lightweight yet robust aluminum construction for long-lasting performance. - • **Effortless Compatibility:** Seamlessly fits JIS square-taper cranksets for hassle-free upgrades. - • **Precision Spindle Length:** 122.5mm spindle ensures optimal chainline stability and smooth pedaling. - • **Cost-Effective Reliability:** Affordable, easy-to-replace design perfect for daily commuters and workhorse bikes. - • **Weather-Resistant Sealed Bearings:** Keep grit and moisture out, guaranteeing reliable rides in any condition. ## Overview The Shimano Square Type Bicycle Bottom Bracket (BSA 68MM, Spindle 122.5MM) is a durable, weather-resistant component designed for JIS square-taper cranksets. Featuring a sealed cartridge bearing and lightweight aluminum adapter, it delivers reliable chainline stability and low-maintenance performance, making it an ideal choice for daily commuters and work bikes exposed to all weather conditions. ## Description 5 JJ-----Shimano BB-UN300 BOTTOM BRACKET - STANDARD -SHIMANO quality/performance cartridge bearing square bottom bracket -Better chainline stability with chain line stabilizer -Series: Shimano Tourney TX800 Series -Fits JIS square-taper cranksets -Hollow spindle -w/o fixing bolts -Adapter material: Aluminum. 1009904(014-023)3/16 --#22123(10:2/23/23:ARI 22723(30: 3/7/23:ARI---1:rtn on 3/20/23---1:rtn on 5/19/23----1:RTN ON 5/15/23 101623(20:10/30/23:ari 122623(20:1/4/24:ari 122823(20:1/4/24:ari----1:RTN ON 1/19/24 Review: Tough, Cheap, and Perfect for a Workhorse Bike - I use the SHIMANO Square Type Bottom Bracket (BSA 68MM, Spindle 122.5MM) on my daily work bike — the kind that gets locked up outside in all weather, 365 days a year. Rain, snow, sun — you name it, this bike sees it, and this bottom bracket has proven to be the perfect match for that kind of abuse. It’s not fancy, but that’s exactly what I want. It’s sealed, so it keeps the worst of the elements out, and when it finally starts to feel knotchy or grindy after a couple of years (which is totally fair given the conditions), it’s cheap and easy to swap out. For the price, I don’t mind replacing it every two years — it beats spending time and money trying to overhaul something more expensive that’s going to get trashed by weather anyway. The 122.5mm spindle gives good chainline spacing for my setup, and the install is straightforward with a basic bottom bracket tool. Once it’s in, I don’t think about it again for a long time — exactly how a commuter part should be. If you’ve got a beater or work bike living outside like mine, this bottom bracket is a no-brainer: reliable, low-maintenance, and cost-effective to replace when the time comes. Review: Good replacement. Easy to install. - My original bottom bracket exploded. This was a perfect replacement. ## Features - Fits JIS square-taper cranksets - Adapter material: Aluminum - SHIMANO quality/performance cartridge bearing square bottom bracket - Better chainline stability with chain line stabilizer ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08C786DW8 | | Best Sellers Rank | #78,555 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #16 in Bike Bottom Brackets | | Brand Name | SHIMANO | | Color | Black | | Customer Reviews | 4.5 4.5 out of 5 stars (329) | | Date First Available | November 17, 2009 | | Included Components | Bottom Brackets | | Item Dimensions LxWxH | 5.63 x 2.03 x 1.91 inches | | Item Package Dimensions L x W x H | 6.61 x 2.17 x 1.93 inches | | Manufacturer | Shimano | | Material | Alloy | | Model Name | Bsa 68mm, Spindle: 122.5mm | | Number of Items | 1 | | Package Weight | 0.3 Kilograms | | Part Number | EBBUN300B22X | | Size | One Size | | Sport Type | Cycling | | Style | Bottom Bracket | | Suggested Users | unisex | | Warranty Description | Limited Warranty | ## Images ![Square Type Bicycle Bottom Bracket - BSA 68MM, Spindle: 122.5MM - EBBUN300B22X - Image 1](https://m.media-amazon.com/images/I/51PPpbGvVfL.jpg) ## Questions & Answers **Q: The tittle says 110 mm long but the image says 123, shall I trust its a 110mm ?** A: Different lengths may be available depending on the part number chosen. The same image may be used for multiple products of similar type. **Q: Is this equal to a shiman0 un26, 68x127,5mm bottom bracket.** A: Please watch RJ the bike guy's How To Upgrade Vintage Bike With Sealed Cartridge Bottom Bracket in YouTube **Q: Will this fit a mongoose sycamore 26in mountain bike** A: when you remove the old one read the dimensions on the bb. you can even take a measuring tape and measure the hole. don't throw away the used one until the new one is found and installed. maybe youtube your bike repair. **Q: How much does this bottom bracket weigh?** A: Amazon’s specs say .29 Kg. As the package weight. The packaging would not be significant. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Tough, Cheap, and Perfect for a Workhorse Bike *by C***Y on July 28, 2025* I use the SHIMANO Square Type Bottom Bracket (BSA 68MM, Spindle 122.5MM) on my daily work bike — the kind that gets locked up outside in all weather, 365 days a year. Rain, snow, sun — you name it, this bike sees it, and this bottom bracket has proven to be the perfect match for that kind of abuse. It’s not fancy, but that’s exactly what I want. It’s sealed, so it keeps the worst of the elements out, and when it finally starts to feel knotchy or grindy after a couple of years (which is totally fair given the conditions), it’s cheap and easy to swap out. For the price, I don’t mind replacing it every two years — it beats spending time and money trying to overhaul something more expensive that’s going to get trashed by weather anyway. The 122.5mm spindle gives good chainline spacing for my setup, and the install is straightforward with a basic bottom bracket tool. Once it’s in, I don’t think about it again for a long time — exactly how a commuter part should be. If you’ve got a beater or work bike living outside like mine, this bottom bracket is a no-brainer: reliable, low-maintenance, and cost-effective to replace when the time comes. ### ⭐⭐⭐⭐⭐ Good replacement. Easy to install. *by J***N on November 16, 2025* My original bottom bracket exploded. This was a perfect replacement. ### ⭐⭐⭐⭐⭐ Works well *by K***N on November 30, 2025* This worked great for my bike, a little cheaply made but it didn’t cost a lot ## Frequently Bought Together - SHIMANO Square Type Bicycle Bottom Bracket - BSA 68MM, Spindle: 122.5MM - EBBUN300B22X - BIKEHAND Bike Bicycle Compatible with Shimano Bottom Bracket Removal Remover Tool - Park Tool PolyLube 1000 Bicycle Grease --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/231227897-square-type-bicycle-bottom-bracket-bsa-68mm-spindle-122-5mm](https://www.desertcart.co.uk/products/231227897-square-type-bicycle-bottom-bracket-bsa-68mm-spindle-122-5mm) --- *Product available on Desertcart Great Britain* *Store origin: GB* *Last updated: 2026-04-23*