There are hundreds of types of different weight plates and barbells. While some of them must conform to specific standards others are made for ease of use or looks. The sleeve length of a 7ft Olympic Barbell can vary from 390 mm all the way up to 433 mm. Most people stack 20 kgs Olympic Weights on their barbell. This is how many weight plates you can fit on your barbell with an average sleeve length of 415 mm. 1. Cast Iron/Rubber Coated Plates – Our 20 kgs weight plates are 45 mm thick, which means that you can stack up to 9 x 20 kgs plates per side. This would equate to 380 kgs including the bar. 2. Bumper Plates – Our standard 20 kgs Bumper Plates are 80 mm thick, meaning that you can stack 5 x 20 kgs Bumper Plates on each site. This would equate to 220 kgs including the bar. 3. Competition Bumper Plates – Our competition bumper plates are 43 mm thick, meaning that you can stack up to 9 x 20 kgs plates either side. This would equate to 380 kgs including the bar. 4. IPF Powerlifting Plates – Our thinnest 20 kgs Powerlifting Plates are 19.2 mm thick. Meaning that you can stack up to 21 x 20 kgs plates per side. This would equate to 860 kgs on the barbell. Or 920 kgs if you used 25 kgs weight plates on a barbell with 433 mm sleeves. Sadly, outside of the standard bumper plates, these loaded weights will remain theoretical for most of us. Only people who write negative comments on fitness content on social media can handle these types of lifts. It is important to note, that not every barbell is designed to handle that much weight. Some will deform and remain bent after loading them up with half of the weight. While others will start “vibrating” aka flexing making them too difficult to stabilize and use.