1987 Fiat Bertone — X1/9
The 1987 Fiat Bertone X1/9 came from the factory equipped with 185/60R13 tires. If your vehicle has since been fitted with aftermarket or upsized wheels, your actual tire size may no longer match this factory spec — always confirm against your door placard before buying.
185/60R13
| Section width | 185 mm |
|---|---|
| Aspect ratio (sidewall height) | 60% (111 mm) |
| Rim diameter | 13" |
| Overall tire diameter | ~21.7" |
| Revolutions per mile | ~928 |
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What this size means for your Fiat Bertone
On the 1987 Fiat Bertone X1/9, the factory 185/60R13 measures about 21.7″ in overall diameter with a 111 mm (4.4″) sidewall, and completes roughly 928 revolutions per mile. Its 60-series aspect ratio gives a taller, comfort-biased sidewall that favors ride quality and shrugs off rough pavement. In tire terms it is a small-diameter fitment typical of older or economy vehicles.
Because the 1987 Fiat Bertone predates many current tire lines, confirm this size is still stocked before ordering — some vintage fitments are now served mainly by specialty and classic-car tire suppliers.
Fiat Bertone tire sizes by year
- 1989 Fiat Bertone 185/60R13
- 1988 Fiat Bertone 185/60R13
- 1986 Fiat Bertone 175/70R13
- 1985 Fiat Bertone 175/70R13
- 1984 Fiat Bertone 175/70R13
- 1983 Fiat Bertone 175/70R13
- 1982 Fiat Bertone 175/70R13
How to read a tire size
A tire size like 225/45R17 breaks down into three parts:
the first number is the section width in millimeters
(the tire's width from sidewall to sidewall), the second is the
aspect ratio — the sidewall's height as a percentage of
that width — and the number after the "R" is the rim
diameter in inches. A letter prefix (P or LT) indicates
Passenger or Light Truck construction; its absence usually means
Euro-metric sizing.
Some trucks and off-road tires instead use "flotation" sizing, like
37X12.50R17 — here the numbers are the tire's overall
diameter and width in inches directly, with the rim diameter last.
Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.