Tire Flip weight equiv.

[Erik Hayes]

Does anyone know approximately how much force it takes to flip a tire relative to its weight. For example; tire weighs 500lbs, force to lift = ?????. I don't have a fish scale to lift one side. Is it standard, like 50% of the weight?

[Don Stevenson]

The centre of gravity of the tyre lies at it's exact centre in the middle of the hole.

When you lift the tyre by one side to flip it the tyre acts as a lever effectively halving the weight that you feel in the hand.

Thus a 500lb tyre should be the equivalent of a 250lb DL off the ground.

In practice it's not quite that simple because of the awkward stance, low start height and grip issues but that's the physics

[Erik Hayes]

Thanks Don. It like a heavier ratio for all the reasons you pointed out.

[Dave Van Skike]

the thickness (tread width) also makes a difference, as does the diameter (duh).

the weight and effective difficulty are not linear.

my 65 year old mom can flip a 400 for reps

I can flip our 750 for about 12-15 in 90 seconds

I am hoping to flip our 1100 this weekend or next, hopefully for a double.

but I've flipped a wee little 700 in a contest that almost buried me.

[Garrett Smith]

Dave,
Was that 700# tire relatively tall and narrow?

I'm assuming so, based on this:

The principle of the lever tells us that the above is in static equilibrium, with all forces balancing, if F1D1 = F2D2.

http://en.wikipedia.org/wiki/Lever

[Dave Van Skike]

Originally Posted by Garrett Smith

Dave,
Was that 700# tire relatively tall and narrow?

I'm assuming so, based on this:


http://en.wikipedia.org/wiki/Lever

zackly. skinny tires are harder.

[Dave Lemanczyk]

500-600 pound tires felt like a 300 deadlift
700-800 pound tires felt like a 400 deadlift
800-900 pound tires felt like a 500 deadlift
900-1,000 pound tires felt like a deadlift I am yet to pull

These numbers are based on how I felt flipping them in relation to the deadlift. If you don't have a tire, just deadlift for very high repeitions of the weight that corresponds based on the information above. I don't have a graph, only experience but it may help you.

Doing high repetition deadlifts with 300 pounds will become difficult over time. Its very important to build a strong foundation of strength prior to flipping heavy tires.