I’d like to see that myself.
Is this the science of tires yet?
No luck finding that notepad yet.
Durometer readings are comparable but don’t tell the whole story.
Temperature reading is crucial to compare durometer readings.
Age and uv exposure make the durometer readings higher, as well as higher temps reduce the durometer reading.
BFg reds for example at 65 degrees are significantly harder than sticky treps and sticky sx’s
However when warm around 100* soften considerably more than the other two.
Reds are open cell rubber, so when freezing temps occur, the moisture in the surface of the rubber freezes and it’s like ball bearings on ice. Supper slippery.
Almost all other tires are closed cell rubber.
Dot tires are all closed cell rubber.
All of these are from memory, in the shade, in 78* shop. Durometer readings.
New red 63
Old red. 70
New tsl 69
Old tsl 79
Old sx2’s 80
Old irok 79
New irok 72
Old sx 81 (non sticky)
New sx 71 (non sticky)
New bogger 73
BFg a/t. 82
Bridgestone something e-rated 84
Michelin ltx at. 88
205 Trailer tire 74
Brand new nitto 40” TG 76
In 65* shade sticky’s, all were less than 1yr old.
39. Red. 65
42” trep 58
39” Creepy. 61
43” sx. 59.
Don’t remember the hot numbers specifically on the trail as I measured them in a hurry, and didn’t take picture of temp and durometer as usual,
But most of the sticky’s were around high 40/ low 50s riding around on trails in the sun on dry rock with surface temps above 90*
