That is a definition of how far your steering axis is ahead of your front axle. Diameter has an affect upon your trail figure. Considering that a rider can use a lower pressure with the wider 650B tires, that difference could be larger by a small amount, however, we will assume similar differences for this comparison. We can see then that the overall diameter difference is a bit more than 3/4’s of an inch, or 2.01cm. WTB Horizon/Velocity Aileron Wheel: 26 7/8th” or 68.26cm diameter.Gravel King/HED Ardennes+ Wheel: 28 1/16th” or 70.27cm diameter.Following are the measurements for diameter. Both tires are set up tubeless in this demonstration and both set to the same air pressures. This compares most favorably with the 47mm Horizon, which is right at 47mm on the Velocity Aileron rim. The Panaracer Gravel King 40, as we tested here, was found to be more of a 42-43mm tire based on user feedback and our own testing. I chose to use two tires more closely related in volume and width rather than diameter, so keep this in mind. The 700c X 40mm Panaracer Gravel King SK on the left and the 650B X 47mm WTB Horizon on the rightĬomparison: What you are looking at above are two wheels on a board which has been leveled using a liquid filled level and on which are the two wheel sizes in question. So, following are a few things that may help you sort through the benefits and negatives in your specific case when looking at the switch. What are the differences between these 700c X 35-40mm wheels and tires and 650B X 47mm wheels and tires? Wheel diameter is a very noticeable difference, but there are other factors to consider when thinking about making the swap from 700c to 650B on your gravel machine. However most gravel going bikes are using tires much wider and with much more volume than a 700c X 28-30mm tire. Traction is another area where this swap might make sense for the rider, as a bigger, wider contact patch results when a lower pressure 650B tire is used over that of the 700c X 28-30mm tire. You might gain a more comfortable ride using 650B wheels and tires, since the increased volume in the tires might allow you to use a lower pressure than with the 700X 28mm-30mm tires. This means that a swap between wheels on a bicycle that fits both would result in a very similar bottom bracket height, gear inch figures, and trail geometry. In a traditional 650B conversion, where the 650B tires are swapped into a 700C road bike, most authorities agree that a fat, 42mm-47mm 650B tire will approximate a 700 X 28-30mm wheel and tire’s diameter. ![]() The Raleigh Tamland Two with traditional 700c wheels and 40mm tires. ![]() The Raleigh Tamland Two with 650B wheels and tires. So, this post will aim to compare 650B and 700c wheels and give you, the reader, some information with which you can use to decide which might be better or interesting to try for yourself. Obviously, we are testing a set of these wheels and tires, ( seen HERE), and we have seen a question arise about the differences between the wheel sizes themselves. However as with mountain biking, we are seeing some 650B wheels and tires being used now. Sure, we see the occasional 26 inch wheel out there, but by and large the traditional road wheel size of the last 30 plus years has been the size most often used for gravel road riding. In the gravel cycling scene, 700c sized wheels have been dominant.
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