Rank #7 in Best Leg Extension Machine 2026: 10 Ranked, and the Capacity Claims That Don't Add Up
Deltech Fitness DF106 Leg Curl and Extension Attachment
Price and rating as shown on Amazon when we collected them. Both change.
Seventh in this guide, the Deltech Fitness DF106 is a plate-loaded leg curl and leg extension attachment that clamps onto a bench rather than standing on its own. It is listed at £141.99 and rated 4.5 out of 5 from 36 ratings.
Its finding here is a rare one: the DF106 is the listing whose capacity number survives being checked. The title says "300 LBS Capacity", the specification field "Maximum Weight Recommendation" says 300 Pounds, and "Tension Supported" says 300 pounds — the same figure three times, with no second, larger number hiding further down the page. The star breakdown is also unusual in shape: 79 five-star ratings, 12 four-star and 9 one-star, with nothing at all at two or three stars. The catch is fit rather than strength — Deltech Fitness says it fits all Deltech benches that accept attachments and "may or may not fit other manufacturers products", so the 1-3/4 in mount tube is the measurement to hold against your own bench before ordering. Everything on this page, specification values and customer comments included, comes from the Amazon listing and not from any testing we have carried out.
How those 36 ratings break down
An average hides its own shape. This is the spread behind the 4.5 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £141.99 |
|---|---|
| Rating | 4.5 out of 5, from 36 ratings |
| Stated capacity in title | 300 pounds |
| Maximum Weight Recommendation | 300 Pounds |
| Tension Supported | 300 pounds |
| Mount tube | 1-3/4 in, fits into a standard 2 in tube |
| Item weight | 15.9 kg |
| Strap type | No Strap (as listed) |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“So glad I found this one before I bought the Body Solid one. This fits my Body Solid bench perfectly, plus it came with the Olympic weight adapter (something you have to pay extra for with the Body Solid) and it's slightly adjustable, the Body Solid is not.”
Verified purchase“This fit my bench really well. It's heavily made, very adjustable. I was shocked it's as good as it is at this price point. The only improvement I could recommend would be an adjustable stop to but up against your bench so it doesn't swing back so far. But it's a non issue once it's setup for it.”
What it is up against
The rivals it was ranked against in Best Leg Extension Machine 2026: 10 Ranked, and the Capacity Claims That Don't Add Up.
Questions people ask
How much weight can the Deltech Fitness DF106 hold?
The listing gives 300 pounds in the title, in "Maximum Weight Recommendation" and in "Tension Supported" — the same figure three times, with no higher number anywhere on the page.
Will the DF106 fit my bench?
Deltech Fitness says it fits all Deltech benches that accept attachments and may or may not fit other manufacturers' products. The listing asks you to check that your bench's inside opening is at least 1-3/4 in.
Does it take Olympic plates?
The listing describes the DF106 as plate loaded for standard and Olympic plates, and a reviewer reports the Olympic weight adapter came in the box, which they say you pay extra for with the Body Solid equivalent.
Are the assembly instructions clear?
The listing promises detailed instructions and an available assembly video. A reviewer says the paper instructions tell you nothing about the set screw for the Olympic adapter and that the video is the better of the two.
How big is the mount tube?
1-3/4 in, which the listing says fits into a standard 2 in tube.
How heavy is the attachment?
Item Weight is listed as 15.9 kg, and the specification states Number of Items: 1.
Comments
Reader comments are not checked against the manufacturer's claims above.
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