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The YunSCM 20x4.0 is a two-pack of folding fat bike tires with a tall, aggressive directional tread meant for loose dirt, snow, sand and rough pavement. They are wire-bead tires with a 198 lb max load per tire and a 5-30 PSI range, so you can run them soft for traction or firm for rolling. The foldable soft-wire construction makes them easier to store and carry than rigid fat tires, but the bead can arrive slightly out of shape and needs care when mounting. They suit 20-inch fat bikes and e-bikes used on mixed terrain; riders who want a light, fast-rolling tire for pavement should look at a smoother, lower-profile tread instead.
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This is a set of two 20 x 4.0 inch folding fat bike tires. They are made mainly for 20 x 4.0 electric bicycles. They can also be used on mountain bikes and other bikes that take a 20 x 4.0 fat tire, and on ordinary wide-tire bicycles.
The tires have a large, directional tread for grip and durability on roads and off-road. The tire is thicker than an ordinary wide tire. A soft steel-wire bead lets the tire fold for storage and carrying. After unfolding, the tire is relatively soft and can be installed normally.
The bead wire may not be completely flat after delivery, which can cause uneven installation. To fold the tire again after removing it, gently fold or roll it from the state it arrived in, without forcing it. Before installing, check that the bead wire is not badly bent or exposed and that the rim has no burrs. If a tube bursts after installation, check the tire for a broken bead wire, exposed metal or damaged cord fabric before replacing the tube.