Vulcan Prime Urethane Bumper Plates
90 Shore urethane on a solid hard-chromed insert, with thickness published per size and a raised lip that keeps the profile low.
Specs
| Material | 90 Shore hardness urethane |
|---|---|
| Insert | Solid steel, hard chromed |
| Diameter | 450 mm, IWF standard |
| Insert diameter | 50.4 mm |
| Weight tolerance | ±1% |
| Edges | Bevelled, with a raised lip |
| Profile | Lower profile |
| 10 lb thickness | 18 mm |
| 25 lb thickness | 38 mm |
| 35 lb thickness | 43 mm |
| 45 lb thickness | 48 mm |
| 55 lb thickness | 53 mm |
| Odour | None |
These figures are copied from Vulcan Strength’s own published specs and were last checked on 2026-08-31. Manufacturers revise products without notice, and variants differ. Confirm anything your decision depends on with Vulcan Strength before you buy.
Choose this one if
- You drop the bar often enough that plate life is a real cost
- You want the thinnest bumpers here so more fits on the sleeve
- You want colour that will not fade and rubber that will not smell
The detail
These are the thinnest bumper plates covered on this site. A 45 lb Prime urethane plate is 48 mm (1.89 in), against 2.15 inches for Rogue's competition plates and 3.25 for HG 2.0. Across five plates a side that is seven inches of sleeve — the difference between running out of bar and not.
Urethane is what buys that. It is denser and tougher than rubber, so less material carries the same weight and takes the same drops. It also does not shed, does not chalk, and — as Vulcan notes — has no odour, which anyone who has unboxed a set of rubber bumpers into a closed garage will appreciate.
A solid hard-chromed steel insert is the right construction at the part that takes every impact and every slide onto a sleeve. Hard chrome is thicker and harder than decorative plating and will not wear through.
90 Shore hardness puts these between training bumpers and competition plates — low bounce without being brittle.
The bevelled edges and raised lip are practical rather than cosmetic: bevels let the plate load onto a bar without catching, and a raised lip gives you somewhere to get your fingers when plates are flush against each other on a tree.
±1% tolerance is good but looser than Vulcan's own Absolute Training plates at ±10 grams. If accuracy matters more than thinness, that is the comparison.
Vulcan states plainly that 10 lb plates are not to be dropped on the barbell alone — true of every bumper ever made, and worth repeating.
Colour-coded, and Vulcan claims the colour and appearance hold up over time — which is what urethane does and painted rubber does not.