My theory on dumbbells (srs)

[someguy11]

A dumbbell with 100lbs mark on them in big public gyms like this:



is lighter than 100 pound metal dumbbel like this:


(this is only illustration)

I struggle with 100s in my gym, and only big bros lift them. They are fully iron and theyre big as fuark. Then I come to the Misc and some 160lbs skinnyfats lift it for 12 reps. And its ALWAYS the rubber dumbbells not bigger than 60s in my gym. Also when I change my gym from time to time, I can lift heavier ones for more reps. My theory is that those gyms want to make those skinnyfat newcomers think that they are lifting big weights, so they renew their membership and buy their protein shakes (semi srs).
Im not saying their weight is 30lbs less than written, but it must be at least 5-10lbs.


Cliffs: New plastic dumbbells are labeled wrong therefore are lighter than old metal ones. Fact.

EDIT: This thread is about mislabeling dumbbells and plates in a gyms. Im not saying that 100lbs of rubber =/= 100lbs of iron.

[40InchVert]

not sure if srs

[jenno007]

OP what's heavier, 1 ton of feathers or 1 ton of bricks?

[Achilles8]

ITT: op is weak

[JazB]

You're wrong bro, the gravitational force exerted by the earth is lower in america. Therefore, they can lift more weight.


















































wat

[someguy11]

OP what's heavier, 1 ton of feathers or 1 ton of bricks?

You dont get me, Im saying 100lbs MARK on them, not the actual weight.

[TonytheOnly]

Too bad this theory is so hard to test... If only gyms had both dumbbells and a scale. Ahh what a world that would be....

[bubbletea9]

OP what's heavier, 1 ton of feathers or 1 ton of bricks?

obviously 1 ton of bricks cause bricks are heavy as fuk...








notsrs

[CheeBye]

Physics major here, OP is spot on. Both of them have similar mass but different densities. The lower density plastic ones are thus easier to lift, because they 'float'.

[Torpeda]

OP what's heavier, 1 ton of feathers or 1 ton of bricks?

1 ton of bricks, it's scientificly proven you fukin potato.

[Swag1070]

if there the same weight there the same weight.

[PervedOut]

People thought I was nuts when I said weights differ by gym. I could do seated overhead DB shoulder press with the 85's and a spot in my old gym and 75's for reps with no spotter

In the new gym I can barely get the 75's up.

Also the machines at Planet Fitness were terribly mis-labeled

BRB benching the stack on machine bench press (245) when its realistically like 180

[HALOBRYAN]

i lifted both metal and rubber dbs they feel the same you are just ****get making excuses

[ftown]

Physics major here, OP is spot on. Both of them have similar mass but different densities. The lower density plastic ones are thus easier to lift, because they 'float'.

brb throwing dumbbell in air and its suspended in mid air

[mille695]

ITT op is a fukking moron

[someguy11]

Misc is bad at reading, or trolling. Im saying 100pound mark Im not that dumb.

[donovan11213]

Physics major here, OP is spot on. Both of them have similar mass but different densities. The lower density plastic ones are thus easier to lift, because they 'float'.

sounds legit

[Postmort3m]

Need them condensed helium filled dumbells......

Brb, pressing 200's while casually holding a conversation.

[Future-Swole]

OP is right. The metal ones at my university gym feel heavier than the YMCA. I did 65lbs for 4x5 shoulder press at the YMCA (uni gym closed) with the rubber ones, went to my gym the next week and couldn't even do one rep with the metal 65s.

[upt88]

ITT: OP makes more excuses why manlets out lift him.

[MiKey4]

They are probably the same mass, but if they are different shapes they will have different moments of inertia, and you are presumably doing dumbell curls in a twisting motion. If the mass is concentrated towards the centre of the dumbell (first pic) then it's got a smaller moment of inerta and it's easier to rotate, whereas if the mass is further away from the centre it's harder to rotate (meaning, it requires more torque to attain the necessary angular momentum for the lift).

If you're doing something like a concentration curl it shouldn't be any different, just placebo.

[Budjola]

Physics major here, OP is spot on. Both of them have similar mass but different densities. The lower density plastic ones are thus easier to lift, because they 'float'.

soo 100lb Db wont sink when u throw it in ocean?

[slvrgtmiscer]

Most gyms have scales. Next time you go, put one on the scale.

[HALOBRYAN]

in your theory 5lb rubber dbs would float?

[disbeast576]

Weights will always vary. The 45's at my gym are actually 47lbs.

[MakeABanana]

Physics major here, OP is spot on. Both of them have similar mass but different densities. The lower density plastic ones are thus easier to lift, because they 'float'.

This ...

[Pronobis]

At my gym the weights are listed differently.

A 50 pound weight at another gym will be listed as 52.5 because of the little bar/grip/handle holding the actual weights would be around 2.5 pounds.

The weights go like this at my gym 63, 65, 74,78, 85.

At my old gym the iron weights would read 80 pounds but in actuality it was 85

at ****gy time soccer mom gyms with the rubber weights it's exactly what it reads.

Idk if this makes sense, Im focusing on other **** atm.

[PervedOut]

Most gyms have scales. Next time you go, put one on the scale.

What if the scale is wrong too?

philosaraptor.jpg

[fuuuuuuuuu]

i will tell you why they feel different

it has to do with the width of the handle.. smaller handle = feels lighter because its easier to grip.. SRS

[Brokensword8402]

I think there is more of a mind thing with steel vs rubber. It looks heavier based on people's idea of rubber vs steel. Plus people might concentrate harder considering rubber might feel better than steel hitting you if dropped. Not to mention it might take a little more energy rolling hard a$$ steel with metal poles sticking out up your thighs to bench than it would rubber weights.