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Tech

Two old Shimano square taper bottom bracket spindles lying side by side on rocky dirt, one bare silver, one rusted and labeled Shimano BB-UN71

tech

The Humble Square Taper

Thirty-plus years of wrenching, a lot of old mountain bikes, and a case for one of the most underrated pieces of bicycle technology.

An assortment of chainrings with different tooth counts laid out on a workbench mat

tech

The Single-Speed Gear Calculator

Gear inches, development, gain ratio, and speed at cadence: the gearing math that actually matters when you only have one gear to pick.

Close-up of a single-speed conversion on vertical dropouts, showing a Surly chain tensioner and axle hardware holding the rear wheel in place

tech

So You Want to Build a Single Speed?

A practical guide to dropouts, chain tension, hubs, freewheels, gear ratios, crank length, and turning an innocent bicycle into a one-geared bad decision.