Skip to content
PartMap

How to read your tyre size (e.g. 185/65 R15 88H)

Updated 22 Oct 2026

The size is moulded on the side of every tyre. Tell the tyre shop or vulcanizer the full size, or send them a photo of it, so you get the right replacement.

185
Width: 185 mm across the tread.
65
Sidewall height is 65% of the width, about 120 mm. Lower numbers mean a thinner sidewall.
R
Radial construction, which almost all car tyres use.
15
Fits a 15-inch rim (wheel). The whole tyre is about 621 mm tall.
88
Load index: up to 560 kg per tyre.
H
Speed rating: safe up to 210 km/h.

When you replace tyres, match the size on your car's door sticker or manual, and don't go below the original load index or speed rating.

Also on the sidewall

  • Manufacture date: a four-digit code such as 2321 means week 23 of 2021. Tyres age even when unused. Be wary of very old ones, including tokunbo tyres.
  • Tread wear indicators: small bars in the grooves. When the tread is level with them, replace the tyre.

Find tyres

Or browse tyre shops and vulcanizers by state.

More guides