FED Fitness Feierdun DB1 Quick Adjustable Dumbbell review

FED Fitness, the company behind Flybird benches, sells the Feierdun DB1 as a direct alternative to the SelectTech 552. It covers the same 5 to 52.5 lbs per hand, with 2.5 and 5 lb increments set by independent dials on each end, and an alloy-steel build with a non-slip 1.25 inch handle. The two specs that set it apart are the 3-year warranty and the 30-day money-back guarantee. At $389.99 for the pair when we checked, it was slightly cheaper than the Bowflex sale price and well under Bowflex's $479 regular price. The doubts are about scale. FED lists the product size as 20.86 by 12.6 by 12.6 inches, which appears to include the base, and the product page had only 11 reviews when we checked, so there is little long-term owner feedback. If the Bowflex sale ends, this is the closest like-for-like option.

Who it is for

buyers who want a longer warranty than Bowflex

Price

$389.99 at FED Fitness's US store when checked for the pair, with free shipping.

Regular price $389.99 USD
Quoted from the vendor pricing page on November 12, 2026.

Key features

• 5 to 52.5 lbs per dumbbell
• Dual 2.5 and 5 lb increments
• Independent dual dials
• Reinforced alloy-steel build with a non-slip handle
• All-in-one compact base

Strengths and weaknesses

• Strength: 3-year warranty, one year more than the SelectTech 552's parts warranty
• Strength: Same 5 to 52.5 lb range as the SelectTech 552
• Strength: 30-day money-back guarantee
• Weakness: Listed product size is 20.86 by 12.6 by 12.6 inches
• Weakness: Only 11 reviews on the maker's page when checked
• Weakness: Less widely sold than the Bowflex and PowerBlock sets

Key facts

• Price: $389.99 (pair)
• Weight range: 5 to 52.5 lbs per dumbbell
• Increments: 2.5 and 5 lbs
• Handle diameter: 1.25 in
• Warranty: 3 years

Where it ranks

FED Fitness Feierdun DB1 Quick Adjustable Dumbbell is No. 7 in our Best Adjustable Dumbbells verdict.