The Snag Journal

Why riders are strapping flint to their boots

A strap, a steel plate and two flint rods. How the night-ride trick works, what it's like to use, and the catch nobody mentions in the clips.

By the Snag team · 2 min read · Updated September 30, 2026

Snag sells the kit in this story. The photos and clips show the real kit.

You have probably seen the clip. A rider drops one boot to the road at night, and a trail of sparks pours out behind it like someone is working a grinder on the asphalt. It looks like a stunt-show effect. It is a stretch strap, a steel plate and two rods of flint.

The real kit on brick. No editing on the sparks.

A stunt trick that anyone can strap on

Spark plates have been a stunt-show trick for years. The catch was always fitting them: most meant screwing a plate into the sole of a boot you would then only use for shows. What changed is the strap. The kits in the clips go on by hand, over the front of a boot or a sneaker, and come off again in a few seconds.

That is why they keep turning up at bike meets. Nobody has to give up a pair of boots for it. You strap it on for the ride home and take it off at the door.

How a rock makes fire

It is the same idea as the flint in a lighter. Drag the rod across something rough and it sheds tiny shavings. Friction heats them enough to catch, and they burn as they fly off. On a lighter that is one spark. Under a boot moving across asphalt, it is thousands of them, strung out behind you.

Close-up of the steel plate with its two flint rods
The plate holds two flint rods flat. The flint is the part that sparks.
Rough, dry asphalt throws the most. Smooth concrete and wet roads throw far less.

What it is like to use

The whole technique is keeping your foot level. Both rods need to meet the road flat, with light contact. Point your toe down and only the tips catch, so you get a flicker instead of a trail. Press too hard and you just wear the flint down faster.

Fit guide: keep the plate level under the toe
Plate flat under the toe, foot level, light contact.

After dark is when it looks best, and it is the shot everyone films. It works on sneakers too, which is why skaters have picked it up.

A night ride with the kit on one boot.

The catch nobody mentions in the clips

Those sparks are hot enough to start a fire. Never use one near fuel, at a gas station, on dry grass or anywhere under a fire ban. Keep it for clear roads with nobody behind you, keep your speed down, and wear proper boots and a helmet.

It is not for use in traffic, and some places do not allow it on public roads at all, so check where you ride.

The flint wears down as you use it. How fast depends on the road and how hard you press, so nobody honest can give you a number. Replacing a rod takes a minute: lift the clip, slide a new one in, press it back.

What you actually get

What is in the box: steel plate, four flint rods, stretch strap
One kit: the stretch strap, the stainless plate and four flint rods, two fitted and two spare.

One kit fits one boot. Most people take two, one per foot, or one for a riding buddy. There is no size to pick: the strap stretches to fit most boots and sneakers, which also makes it an easy gift for a rider.

We sell it with a simple promise. If it does not throw sparks on rough, dry asphalt, tell us within 30 days and you get your money back, used or not.

See the Snag spark kit