Cutting patterns for knobby knife

hi guys,

i was wondering which patterns one could cut into the tire's knobs to increase traktion.

any ideas?

chris

Examples:

bmp_3833.jpg

bmp_3841.jpg

Will that increase traction or reduce tire life? What did you use, looks like sawzall marks, wood blade.

knobby kniffe has been used. it is a tool to re-cut knobbies...

Chris

Siping (rubber)

From Wikipedia, the free encyclopedia

Siping is a process of cutting thin slits across a rubber surface to improve traction in wet or icy conditions.

Siping was invented and patented in 1923 by John F. Sipe [1][2] The story told on various websites is that, in the 1920s, Sipe worked in a slaughterhouse and grew tired of slipping on the wet floors. He found that cutting slits in the tread on the bottoms of his shoes provided better traction than the uncut tread.

The process was not applied to vehicle tires on a large scale until the 1950s, when superior tread compounds were developed that could stand up to the siping process. On roads covered with snow, ice, mud, and water, sipes usually increase traction. A US patent to Goodyear claimed sipes improve tire traction as well, and tend to close completely in the tire "footprint" on the road. A 1978 study by the US National Safety Council found siping improved stopping distances by 22 percent, breakaway traction by 65 percent, and rolling traction by 28 percent on glare ice.

Typically, wide, straight grooves have a low noise level and good water removal. More lateral grooves usually increase traction.

As is often the case, there are compromises. Winter tires, and "mud and snow" tires, may have thousands of sipes and give good traction. But, they may feel "squirmy" on a warm, dry road.

...

A significant problem with field siping is that the tread picks up rocks, glass, and other hard road debris in use, and even with thorough cleaning the knife service life is often poor.

...

ConsumerReports.org recommends against adding more than "the sipes that your tires come with" because of longevity and dry performance.

... and that was about all wikipedia had to say that was applicable, sounds like performance could suffer on hard dry surfaces though.

Siping and grooving are quite different.

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