What are sipes on a tyre?

Sipes are small, thin slits in the tread blocks. Unlike the larger grooves that channel water through the tread, sipes create many additional edges that can help the tyre grip the road surface.

Why do tyres have sipes?

Tyre manufacturers use different sipe patterns depending on the tyre’s intended use. They can help a tread block conform to the road surface and are especially common on winter and all-season tyres, where traction in cold, wet or snowy conditions is important.

Sipes, grooves and tread blocks

• Tread blocks are the larger rubber sections that contact the road.
• Grooves are the wider channels designed to move water away from the contact area.
• Sipes are the fine cuts within the tread blocks that add extra edges and controlled flexibility.

Do more sipes always mean more grip?

No. Tyre performance depends on the complete tread design, rubber compound, construction, temperature and road conditions. Excessive movement in a tread block can reduce steering precision, so manufacturers balance the number, depth and shape of sipes for each tyre design.

Can worn sipes indicate tyre wear?

As tread depth reduces, some sipes become shallower or disappear. That does not replace a proper tread-depth check. Inspect the tyre across its full width and check for uneven wear, cracking, cuts or other damage.

See our guides to tread void ratio, directional tread patterns and asymmetric tread patterns.