
This will help prevent rubbing on the tire and offers enough space for small rocks and other debris to roll through without getting stuck between the fender and tire. I used the Rough Country relay, connected red to battery, black to ground and cut off the on/off switch they supplied and connected Blue wire to my 1 upfitter switch wire under the hood. For example, if you’re running a 42mm tire, choose fenders that are at least 50mm wide. Tire WidthĬheck your tire width (which is printed on the side of your tire), and choose bike fenders at least 8mm wider than the tire. Meanwhile, mountain bikes use the following tire radius sizes: 26 inch, 27.5 inch, or 29 inch. Many bikes-such as road, gravel, touring, commuter, fitness, and fixed gear-use either 650b or 700c to denote the tire radius size. Tire RadiusĬheck the side of the tire for this. There are a few important measurements to consider when fitting your bike for fenders: tire radius, tire width, and frame clearance. With all the variations in frame design and sizing available, fenders-especially the traditional, bolt-on style-are not one-size-fits-all, so you’ll need to measure your bike and select a set that will work for your bike specifically.

$20 at Competitive Cyclist Credit: RockShox Choosing the Right Size
