Thread: Durometer
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Old 04-06-2007, 04:59 PM
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Join Date: Mar 2002
Location: Santa Cruz, CA
Posts: 653

A lot of people think that one reading gives you accuracy and they give up because their readingas are all over the map. I mentioned it earlier and this is directly from from PTC's FAQ at

"How do I use a durometer ?

In use, a durometer is pushed against the sample and the hardness is read from the dial. It is a good practice to take several readings and average the results."

Personally, I take a bunch of readings in different locations on the tire and keep a running tally of the average.

Another thing touched on here is a term I coined years ago I call "bounce". Basically when you true your tires tighter to the rim they have less bounce and therefore, a durometer reading is going to be higher [readff] and you have to figure this in. There is not a good concrete way to do this and much like taking durometer readings without a stand... it's all feel.

The _only_ way to get dead nuts measurements with a durometer is on a stand, on the same diameter foam from the wheel, and nowhere near a glue seam. Unfortunately, we do none of that. HAHAHA
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