ProForm
ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set
$299Cheaper
Best Adjustable Dumbbells · head-to-head
ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set vs Ironmaster Quick-Lock Adjustable Dumbbell System (75 lb)
A sourced, side-by-side comparison. ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set is cheaper at $299. Every spec and price links to its source.
Which is better: the ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set or Ironmaster Quick-Lock Adjustable Dumbbell System (75 lb)?
The ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set wins 1 of the 1 specs we compare head to head; the other wins 0. The ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set is the cheaper at $299. The ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set both leads on specs and costs less — the straightforward pick.
See ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set on Amazon See Ironmaster Quick-Lock Adjustable Dumbbell System (75 lb) on Amazon
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set |  Ironmaster Quick-Lock Adjustable Dumbbell System (75 lb) |
|---|---|---|
| US price | $299 | $699 |
| Brand | ProForm | Ironmaster |
| Released | — | — |
| Weight range (lb) | 10–50 | 5–75 |
| Increments (lb) | 10 | 2.5 |
| Adjustment type | dial | — |
| Sold as | pair | pair |
| Max per dumbbell (lb) | 50 | 75 |
| Weight settings | 5 | — |
| Expandable | No | Yes |
Sources — ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set: proform.com (verified 2026-06-15). Ironmaster Quick-Lock Adjustable Dumbbell System (75 lb): ironmaster.com (verified 2026-07-10).
What's the difference between the ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set and Ironmaster Quick-Lock Adjustable Dumbbell System (75 lb)?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Weight range (lb): ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set 10–50 vs Ironmaster Quick-Lock Adjustable Dumbbell System (75 lb) 5–75
- Increments (lb): ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set 10 vs Ironmaster Quick-Lock Adjustable Dumbbell System (75 lb) 2.5
- Max per dumbbell (lb): ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set 50 vs Ironmaster Quick-Lock Adjustable Dumbbell System (75 lb) 75
- Expandable: ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set false vs Ironmaster Quick-Lock Adjustable Dumbbell System (75 lb) true
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
ProForm Rapid Strike 50 Lb. Adjustable Dumbbell Set
No sourced tester review yet.
Ironmaster Quick-Lock Adjustable Dumbbell System (75 lb)
One whitelisted outlet — BarBend — provides a genuine hands-on, expert-tested review of this exact 75-lb Ironmaster Quick-Lock set, scoring durability and value 5/5. Their tester praises the authentic, wobble-free real-dumbbell feel, knurled chrome-plated handles, and heavy expandability (up to 120/165 lbs via add-on kits), while flagging tedious plate swaps with no color coding, a mediocre sheet-metal stand, and a steep price ($519–$698 per pair). The second whitelisted candidate (Garage Gym Reviews) was not fetchable and excluded, leaving this a single-source result. (1 sourced review, 1 lab-tested.)
Praised: Feels like a real, traditional dumbbell with an even, wobble-free loaded feel; Heavy-duty chrome-plated steel and hand-cast iron build; durability scored 5/5; Quick-Lock system adjusts noticeably faster than other spin-lock/steel dumbbells.
Flagged: Plate swaps are tedious/slow — no color coding, requires mental math; Included storage stand is flimsy sheet metal ('just alright'); Expensive at $519–$698 per pair.