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Kobalt Never Flat rolling resistance

The cadilac of wheel barrows with starpped down big load


I figured the best way to test out the Kobalt never flat wheel barrow tire was to load it down and push it about a quarter mile over uneven ground, across the creek and up our little hill that proved to be too much for the truck.

I'm not sure how to test the rolling resistance, but it feels comparable to the old air filled one with the added security of knowing the tire pressure is always going to be right where it needs to be.



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Doing this accurately is surprisingly hard.

But for a rough indication, put some wheels under the supports of the wheelbarrow as well, and use an unster to pull the loaded wheelbarrow at a constant speed over a level and even surface (e.g. a paved road) on a day without much wind. The force registered on the unster is then the sum of the rolling resistance in the tire and the drag in the wheel bearings etc.

On even a slight incline the force necessary to overcome that will dwarf the rolling resistance, so do multiple runs in both directions and average the results.

Comment by Roland_Smith Wed Jan 19 18:37:58 2011

"Een unster is een type weegschaal dat op markten verscheen in de 1ste eeuw vC." Or at least that's what wikipedia tells me... :-)

Here's google's English translation: A spring balance is a type of scale that markets appeared in the first century BC. It consists of two arms of unequal length. On the shortest arm, the weighing merchandise hung on the longest arm hangs a weight on that arm can move freely. To a large range of weights to measure the spring balance to different brackets could be hung on the hook to light things was relatively far from the product to be weighed, serious were closer.

Comment by anna Thu Jan 20 07:58:46 2011

What I meant was a "veerunster", and I thought it was an english word originally. :-) It seems the correct English translation is a spring scale.

Comment by Roland_Smith Thu Jan 20 12:42:38 2011
Spring scale, though, makes sense.
Comment by anna Thu Jan 20 16:33:09 2011