Read a tyre like a buyer.
The sidewall carries the whole specification. These are the codes we quote against — the same on every Rotarra price list.
Passenger example · 205/55 R16 91V
- 205
- Section width, in millimetres
- /55
- Aspect ratio, % of the width
- R
- Radial construction
- 16
- Rim diameter, in inches
- 91
- Load index: 615 kg
- V
- Speed symbol: 240 km/h
Truck example · 315/80 R22.5 156/150L
- 315
- Section width, in millimetres.
- /80
- Aspect ratio: the sidewall is 80 % as tall as the tyre is wide.
- R
- Radial construction. A dash instead of R means bias.
- 22.5
- Rim diameter, in inches.
- 156/150
- Load index, single and dual: 4,000 kg and 3,350 kg per tyre.
- L
- Speed symbol: 120 km/h.
Load index
Maximum load per tyre, in kilograms, at the reference pressure. Truck tyres carry two: single and dual fitment.
Speed symbol
Maximum speed at the tyre’s load index.
Production date
The DOT code ends with four digits: production week and year. 2526 means week 25 of 2026. We quote this week on every line and print it on the packing list.
Construction and fitting
- R
- Radial construction
- –
- Bias (diagonal) construction, written with a dash: 23.5-25
- ZR
- Radial, for speeds above 240 km/h
- C
- Commercial: reinforced van tyre, two load indices (single/dual)
- LT
- Light truck, sized in the American system
- XL
- Extra load: higher load index at higher pressure
- TT / TL
- Tube-type / tubeless
- PR
- Ply rating: strength class of a bias tyre
- ★ / ★★
- Star rating: strength class of a radial OTR tyre
OTR · TRA codes
A letter for the machine, a number for the tread: L-3 is a loader tyre with rock tread, G-2 a grader tyre with traction tread.
Machine
- C
- Compactor
- E
- Earthmover: dumper, scraper
- G
- Grader
- L
- Loader and dozer
Tread
- 1
- Rib
- 2
- Traction
- 3
- Rock
- 4
- Rock, deep tread
- 5
- Rock, extra-deep tread
- 7
- Flotation
Agricultural patterns
- R-1
- Rear drive, regular lug
- R-1W
- Rear drive, about 20 % deeper lug
- R-2
- Extra-deep lug for rice and cane
- R-4
- Industrial tractor and backhoe
- F-2
- Front, three ribs
- I-1
- Implement, rib
- I-3
- Implement, traction
Bicycle · ETRTO
ETRTO gives width and bead-seat diameter in millimetres: 50-559 is a 50 mm tyre for a 26-inch MTB rim; 25-622 is a 25 mm road tyre for a 700C rim.
Send the sizes. We send the price.
Sizes, quantities and your discharge port. You get prices per size, production weeks and a container plan.