IMPORTANT

1) If the stud is tightened too much by mistake leave it in place and not unscrew it to get the correct position

2) Check the studs every 1000 km / 500 miles and if necessary retighten them

3) Do not continue to tighten after the head of the stud touches the surface of the tire / shoe otherwise the screwed portion of the stud will rip out the rubber seat of the nail. The nail will be then not work properly, will bend and tend to come free

4) Do not fit snow chains id the studs protrude more than 3mm from the tire

STUD SELECTION

To choose the correct stud two factors have to be considered:

1 – THE TYPE OF TYRE.

We recommend using snow or off-road knobby tyres but any tyre of sufficient tread can be utilized.

2 – WHERE IT IS INTENDED TO USE THE STUDDED TYRE

The protrusion of the stud from the tyre, its prominence, controls where it can be normally used, (competitions, off-road, road etc.). We recommend to use studs with less prominence in the areas governed by the Road Regulations, while on private areas studs of a greater prominence can be used.
In either case, always use all of the available rubber in the tread in order to support the stud so it can work better. Choose the tyre, measure the depth of the tread available, after which it becomes a simple calculation as described here. For road tyres, you can add 1 or 2 mm to the measurements, whilst on M&S (mud and snow) tyres you can add 2 or 3 mm. For trucks up to 35 tons, you can add 4 or 5 mm; for trucks over 35 tons, you can add 6 or 7 mm. This total measurement equates to the ‘stud penetration’ into the rubber.

ANTI PUNCTURE LIQUID

If for your application you are forced to use studs longer than those that the tire can hold and you’re going to risk puncturing the tyre is recommended to use the anti-puncture liquid. This comes in different types and brands. We suggest those that are based on a water soluble gel that can be washed away with water and that does not unbalance the wheels nor damage the tyre or the rim.

Example:

Measurement for the tread of a snow tire on a car = 8.50 mm

Add carcass cover 3.00 mm (assumed for a snow tire)

Add the two measurements 8.50 + 3.00 = 11.50 mm

You can mount a stud with “penetration into the rubber” (see table) of 11.50 mm or less.

So, the appropriate stud is type. 1200.

(NB The thickness of the carcass cover is determined by the type of