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The KFFKFF 20-Inch Mountain Bike is a kids' fat-tire bike built on a high carbon steel frame with 20-inch wide tires, seven Shimano twist-grip speeds and dual disc brakes. It is sized for riders about 48 to 60 inches tall, roughly ages 10 to 12, and comes about 85% assembled with tools and gloves in the box. The rigid frame and fat tires favor snow, sand, gravel and mud over fast trail riding. Against lighter kids' mountain bikes it is heavy at 32.4 lbs, which makes climbing and carrying harder, and its 3.9-star rating from 58 buyers points to a mixed reception rather than a standout.
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Lowest price we've seen: $166.99 on Nov 14 at eBay. Tracked across 6 stores since Nov 14.
Buyers give it a middling 3.9 out of 5 from 58 ratings. Those who like it point to the fat tires and disc brakes for rough ground; others find it heavy and report assembly and quality issues.
This is a 20-inch mountain bike for children aged 10 to 12, with a fat-tire design for outdoor riding. It has a high carbon steel frame and a rigid fork with no suspension. Dual front and rear disc brakes handle stopping.
It has a 7-speed drivetrain with SHIMANO twist shifting and a Shimano rear derailleur. The wide tires are meant for varied terrain, including snow, trails, gravel, wet surfaces, mud, sand and beaches.
The bike arrives about 85% pre-assembled. To finish setup, attach the front wheel, secure the saddle, install the pedals, connect the front brake and mount the bike light. The tools needed and a pair of assembly gloves are included.












