Bottom Bracket

Bottom brackets make it possible to turn a bicycle crank in order to move the bicycle forwards.

road bike bottom bracket measurement

The last few decades has seen an enormous increase in the range of road bike bottom bracket designs. I take a look at the most well-known—and a few not so well-known. I also take a look at a key development with huge implications for the road bike bottom bracket, as we know it, namely the rise …

Your Definitive Road Bike Bottom Bracket Guide (Incl Ebikes) Read More »

Is the advent of the press fit bottom bracket the most sorry chapter in the history of BB design? Some would say yes. Without a doubt. Others are more forgiving to the point of swearing that press fit is the ultimate system. Conversations can become heated, at any rate. Laying out the evolution of the …

Press Fit Bottom Bracket (Standards, Tools, Techniques & More) Read More »

A bike’s bottom bracket—or “BB”—together with the rear sprocket and chain constitutes the drive train. This article describes the most common BB types, many of which we have covered in detail in individual posts on FIRST’s blog. Skim through the headings for an overview, then skip to the section that interests you. CONTENTS THREADED BIKE …

The Bike Bottom Bracket Ultimate Guide (Quick Reference) Read More »

Bottom Bracket Cutting Die

A (non-ebike) modern road or mountain bike has either a threaded bottom bracket or press fit bottom bracket—those are the choices. Press fit BBs were, arguably, a solution to a non-problem with threaded BBs. Consistent dissatisfaction with press fit has seen a return to threaded bottom brackets and the increasing uptake of T47 threaded BB …

The Threaded Bottom Bracket Ultimate User’s Guide Read More »

sealed bearings with seals removed

“Why are there so many bottom bracket standards?” is the question every single newcomer to the wonderful world of cycling has asked sooner or later. (Even those of us who have been in the industry forever periodically ask ourselves the same question.) The brief and cynical answer is that manufacturers focused on being different ultimately …

Bottom Bracket Standards from Threaded to Press Fit (& more) Read More »

I take a close look at the T47 standard including a variety of models brands can choose from. 2021 is the year the cycling world gets serious about the T47 bottom bracket standard. Specialized have released their S-Works Tarmac SL7 2021 ; Trek, their Emonda SLR and SL. Trek will also use T47 more widely across their road range in …

T47 Bottom Brackets Guide – 24mm, 30mm (& Unique T47 EBB) Read More »

Cartridge Bottom Brackets

In this article we provide the most comprehensive information about BSA Bottom Brackets online. A continually expanding range of bottom bracket standards, especially in the last 15-20 years has overly complicated the simple task of getting a bike’s cranks rotating. We make the case that the BSA bottom bracket is the cheapest, most effective bottom …

BSA Bottom Bracket – Removal, Installation, Tools Read More »

Bottom Bracket Tool

Find out all you need to know to fix or maintain your bottom bracket right here, in one place. We cover: what tools you need and how to use them. CONTENTS What is a Bottom Bracket Tool?How Do I Know What Bottom Bracket I Have?The Tools and How to Use Them Related Topics How Do …

Bottom Bracket Tools: The Definitive Guide Read More »

Converter Bottom Brackets

At First Components, we spend most of our time devising unique solutions to customer problems which are the key source of our products. Each product represents a unique response to a particular problem the customer ordering that product wanted solved. In this post, we showcase four examples of this in action, four solutions for temporarily …

Bottom Bracket Conversion Kits: Techniques & Technology Read More »

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