{"id":3154,"date":"2023-03-20T17:59:00","date_gmt":"2023-03-20T21:59:00","guid":{"rendered":"https:\/\/brooklynfixedgear.com\/?p=3154"},"modified":"2024-02-05T22:40:50","modified_gmt":"2024-02-06T03:40:50","slug":"how-to-choose-a-bottom-bracket","status":"publish","type":"post","link":"https:\/\/brooklynfixedgear.com\/bikes-and-parts\/how-to-choose-a-bottom-bracket\/","title":{"rendered":"How to Choose Bottom Brackets for Your Fixed Gear Bike"},"content":{"rendered":"\n

As an avid fixed-gear cyclist, I’ve always been passionate about the simplicity and unique feel of riding a fixie. But, like many of you, I’ve faced my share of mechanical issues and upgrades over the years. One component that often goes overlooked is the bottom bracket \u2013 the heart of your bike’s drivetrain. <\/p>\n\n\n\n

In this blog post, I’ll share my recent experience learning about bottom brackets and provide you with a step-by-step guide on how to choose the right one for your fixed-gear bike.<\/p>\n\n\n\n

What is a bottom bracket?<\/h2>\n\n\n\n

A bottom bracket is a crucial component of a bicycle’s drivetrain that connects the crankset (chainset) to the bike frame, allowing the cranks to rotate smoothly and efficiently. It consists of a spindle that connects the two crank arms and a set of bearings that are housed within the bottom bracket shell of the frame. <\/p>\n\n\n\n

The bearings reduce friction and enable smooth rotation of the cranks while pedaling. The bottom bracket essentially serves as the connection point between your frame and the crankset and plays a significant role in the overall performance of your bicycle.<\/p>\n\n\n\n

Reasons to Replace a Bottom Bracket on a Fixed Gear Bike<\/h2>\n\n\n\n

Before diving into the “how-to” section, let’s discuss why you might need to replace your bottom bracket in the first place:<\/p>\n\n\n\n

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  1. Wear and tear: Like any other component, bottom brackets wear out over time. If you’re experiencing creaking or a rough feeling when you pedal, it could be a sign that your bottom bracket needs to be replaced.<\/li>\n\n\n\n
  2. Upgrading: If you’re looking to improve your bike’s performance, upgrading to a higher-quality bottom bracket can provide better power transfer, smoother pedaling, and increased durability.<\/li>\n\n\n\n
  3. Compatibility: If you’re changing other parts of your drivetrain, such as your crankset or chainring, you may need a new bottom bracket to ensure compatibility and proper function.<\/li>\n<\/ol>\n\n\n\n

    How to choose bottom brackets for your fixed gear bike<\/h2>\n\n\n
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    Now that we understand what a bottom bracket is and the reasons for replacing a bottom bracket, let’s dive into the step-by-step guide on how to choose the right one for your fixed-gear bike.<\/p>\n\n<\/div>\n\n

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    1. \n

      Identify the type of bottom bracket<\/h3>\n

      Bottom brackets come in various types, each with a specific interface between the frame and crankset. The most common types for fixed gear bikes are threaded (square taper, external cup, and internal cup) and press-fit. Determine which type your bike uses by either checking the manufacturer’s specifications or consulting your local bike shop.<\/p>\n<\/div>\n<\/li>\n

    2. \n

      Measure the bottom bracket shell width<\/h3>\n

      The width of your bike’s bottom bracket shell determines the appropriate spindle length and bottom bracket size. Common shell widths for fixed gear bikes are 68mm (road) and 73mm (mountain). Measure your shell width using a caliper or ruler, or refer to your frame’s specifications.<\/p>\n<\/div>\n<\/li>\n

    3. \n

      Choose the correct spindle length<\/h3>\n

      The spindle length affects your bike’s chainline, which is crucial for smooth and efficient pedaling. A proper chainline ensures the chain runs straight between the chainring and rear cog. Consult your crankset manufacturer’s recommendations for the correct spindle length, or check with a knowledgeable bike mechanic.<\/p>\n<\/div>\n<\/li>\n

    4. \n

      Select the right bearing type<\/h3>\n

      Bottom brackets can use either cartridge or sealed bearings. Cartridge bearings are often more affordable and easier to replace, while sealed bearings provide better durability and smoother performance. Both options can work well, but consider your budget and riding conditions when making your decision.<\/p>\n<\/div>\n<\/li>\n

    5. \n

      Compare materials and brands<\/h3>\n

      Bottom brackets are available in various materials, such as steel, aluminum, or ceramic. While steel and aluminum are more common and budget-friendly, ceramic bearings can offer better performance and longevity at a higher price. Research different brands, read reviews, and compare features to find the best option for your needs and budget.<\/p>\n<\/div>\n<\/li>\n

    6. \n

      Consult a professional<\/h3>\n

      If you’re unsure about the right bottom bracket for your fixed gear bike or need help with installation, consult a professional mechanic at your local bike shop. They can provide expert advice and ensure your bike is running smoothly.<\/p>\n<\/div>\n<\/li>\n<\/ol>\n<\/div>\n\n\n\n\n\n\n

      Check out this video from Zach Gallardo\u2019 youtube channel, where he shows you how to choose a bottom bracket for your fixed-gear bike.<\/p>\n\n\n\n

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