# FNKTEK Adjustable Leg Curl and Extension Attachment

Source: https://www.ranked10.co.uk/fitness/best-leg-extension-machines/fnktek-leg-curl-attachment
Ranked #10 in "Best Leg Extension Machine 2026: 10 Ranked, and the Capacity Claims That Don't Add Up": https://www.ranked10.co.uk/fitness/best-leg-extension-machines

- Price: £75.99 (checked on Amazon UK on 2026-09-16)
- Amazon rating: 5.0 from 6 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0DWWQBNRS?tag=ranked10-21

The FNKTEK Adjustable Leg Machine Leg Curl Attachment is a bolt-on leg extension and curl station for a power rack, and it takes the number 10 spot in this guide. The listing prices it at £75.99 and it carries a 5.0 rating from 6 ratings, all of them five stars. It offers 8 adjustable positions, uses two padded rollers, and the Item Highlight says it fits 50-75mm square tube power racks.

What keeps it at the bottom of this guide is what it does not claim. Where the entries above it lead with a headline capacity — 360KG, 1100LB, 660LBS — this one puts its only load figure in the smaller Item Highlight field: 175 lbs, about 79 kg, with nothing in the title to compete with that number. What it does carry is a disagreement between its own fields: the Item Highlight describes "Thickened 12cm pads", while bullet 5 says the two roller pads have a diameter of 10 cm. Every figure on this page comes from the Amazon listing and its customer reviews, not from any test we have carried out.

## Specification

| Field | Value |
|---|---|
| Price | £75.99 |
| Rating | 5.0 out of 5, from 6 ratings (all five-star) |
| Brand | FNKTEK |
| Stated max load | 175 lbs (Item Highlight; no matching figure in the title) |
| Adjustable positions | 8 |
| Pad diameter | 12 cm per the Item Highlight, 10 cm per bullet 5 |
| Rack fit | 50-75mm square tube racks; bullet 4 prints '50x50mm0x60mm=x75mm' (as listed) |
| Material and dimensions | Alloy steel, 11 kg, 63 x 33 x 16 cm |

## Questions people ask

**How much weight does the FNKTEK attachment support?**

The Item Highlight gives a 'max load 175 lbs', about 79 kg, for model fnk-uk-futi-shenqutui. No other field on the listing repeats or raises that figure.

**Which power racks will it fit?**

The Item Highlight says it fits 50-75mm square tube power racks. Bullet 4 lists hole diameters of 16mm and 8mm and prints '50x50mm0x60mm=x75mm' as listed. The review from a 2018 Mirafit M100 owner reports a 26mm bolt size worked.

**How many positions does it adjust through?**

Eight. The Item Highlight says '8 adjustable positions' and bullet 4 states the same number.

**What is the diameter of the roller pads?**

Two figures appear on the page: 'Thickened 12cm pads' in the Item Highlight, and a diameter of 10 cm in bullet 5.

**Is it difficult to install?**

Bullet 5 says one person can install it and that the parts are bolted together for a simple connection. The Mirafit M100 owner reports about 25 minutes including adjustments.

**What comes in the box?**

The specification field lists '1X Leg Extension Attachment'; bullet 5 adds that the package also includes a counterweight corner and 3x3 1 3/4 feet tubing.