Iron Gym vs Multi-Gym Pro: same rating, very different contact with your door frame

How a leverage bar actually works, in one paragraph

Neither of these bars is screwed to anything. Both are a steel frame that hooks over the top of the door casing, with a lower arm that presses against the wall above the door. When you hang from the bar, your weight rotates the frame and forces that lower arm harder into the wall - the harder you pull, the more firmly it grips. That is the whole mechanism, and it is why these bars come out in three seconds and leave nothing behind when a lease ends.

It also explains the two ways a leverage bar fails to work. If there is no trim proud of the wall for the top hooks to sit on, the bar has nothing to hook over - flat, trimless modern frames simply will not hold one. And because all the clamping force goes into two small contact areas, the bar can mark paint and compress trim. Everything in the comparison below follows from those two facts.

Side by side

The one difference that decides it: what touches your trim

The Iron Gym presses steel tube against the door casing, with modest pads. It works, it has worked for a very long time, and plenty of people use one for years with nothing worse than a shiny patch. But the load is concentrated, and on soft painted pine - which is most interior trim in rented housing - a concentrated load over months leaves a mark.

The Multi-Gym Pro's answer is a flat, foam-padded guard at each contact point, which does nothing more clever than spread the same force over a larger area. That is the entire functional difference between these two bars and, for a renter, it is worth more than any other spec on the page. If you are getting a deposit back, buy the one with the pads.

Either way, two habits help more than the hardware: put a folded tea towel or a strip of felt behind the contact points, and take the bar down when you are not using it rather than leaving it loaded onto the frame for a year. Our door frame damage guide goes through what actually happens to a frame and how to prevent it.

The second difference: door depth, which rules one of them out

Trim depth is the spec people check last and should check first. The Iron Gym is specified for trim up to 3.5 in.; the Multi-Gym Pro takes frames up to 6 in. deep. If you live somewhere with thick walls - older construction, masonry, a converted building - the Iron Gym may simply not seat properly, and a bar that does not seat properly is not a bar you should hang from.

Width is the other half of it. 24 to 32 in. covers the great majority of interior doors; a 33 in. opening is already at the edge of what the Multi-Gym Pro will take, and anything wider needs a different product class entirely. We have a page on exactly that case - bars for wide door frames - because it is the most common reason a doorway bar purchase gets returned.

What they are both equally bad at

Weighted work. 300 lb is the rated capacity, and that is a static rating on a mechanism that grips by leverage against painted timber. Hanging a dip belt with 50 lb of plates off one of these is outside what either product is designed for. If weighted pull-ups are the goal, you want a wall-mounted bar bolted into studs or a ceiling mount into joists.

Kipping and anything dynamic. The mechanism relies on a steady downward load. Swinging, kipping or dropping your weight onto the bar introduces forces in directions the leverage design does not handle well. Strict reps only.

Headroom. Both bars sit at the top of a door frame, which in a standard 8 ft room leaves very little clearance above your head. Tall lifters end up with bent knees and a partial range of motion - the ceiling height guide has the numbers, and the tall-people roundup covers the ways around it.

And the third option nobody mentions

If the padding argument has convinced you but the price has not, the ProsourceFit Multi-Grip Lite is the same door range (24 to 32 in.), the same 300 lb rating, and ten foam grips instead of three positions, for less than either. The honest catch is in the name: the Lite uses thinner tubing than the full version, so it flexes a little more under a heavy lifter, and the foam wears faster than steel.

For someone under about 200 lb doing strict pull-ups in a standard doorway, that is a completely rational purchase. For a heavier lifter, or anyone who expects to be doing this for years, the extra few pounds buys tubing that does not flex. The full ranking of the category is in best doorway pull-up bars, and if you have not yet settled on a doorway bar at all, the doorway vs wall mount vs free-standing comparison is the page to read before this one.