A 750D wheel measures 750mm in bead seat diameter — larger than the standard 700C (622mm) and gravel-popular 650B (584mm). 750D was a niche size used briefly in some recumbents and time-trial bikes; it’s effectively obsolete in modern cycling. Below, we explain the history, who used 750D, and what to do if you own a … Read more
A mullet bike is a mountain bike with two wheels of different sizes, most commonly a 29-inch wheel at the front and a 27.5-inch wheel at the rear.
The idea is to combine the key benefits of each wheel size, while minimizing their drawbacks, for a bike that’s lightning-fast and super agile, without sacrificing stability.
Some parts of cycling tech can be particularly confusing. One such area in which this is particularly apparent is mountain bike wheel sizes.
Cycling is a sport that has rapidly developed over the past few decades, with new disciplines cropping up and adding new types of tech along with different names for already existing tech and sizing.
Particularly for off-road disciplines, you’re often offered a choice in wheel size when buying or building a bike. The wheelset of a bicycle includes the hubs, bearings, spokes, rims, and often the tubes and tires themselves. It’s not uncommon to be presented with a choice of wheel size, specifically if you’re buying a gravel or … Read more
To measure a bike wheel size, look at the sidewall of your tire — it’ll show two numbers like “700×28c” or “29×2.25”. The first number is the wheel diameter (700c, 26”, 27.5”/650b, 29”). The second is the tire width. If the sidewall’s worn off, measure the rim’s bead-seat diameter (BSD): 622mm = 700c/29”, 584mm = … Read more