Tractor-SizeRadial ↔ bias-ply tire equivalents
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Fiat 90-90 tire size

Factory tire pairs for the Fiat 90-90 (90 HP, 2WD / 4WD):

2WD
Front
7.50-20outside dia. 915 mm
Rear
16.9-34outside dia. 1,585 mmradial equivalent: 420/85R34 (16.9R34)
2WD
Front
7.50-18outside dia. ≈838 mm
Rear
16.9-34outside dia. 1,585 mmradial equivalent: 420/85R34 (16.9R34)
4WD
Front
13.6-24outside dia. 1,200 mmradial equivalent: 340/85R24 (13.6R24)
Rear
16.9-34outside dia. 1,585 mmradial equivalent: 420/85R34 (16.9R34)
4WD
Front
11.2-28outside dia. 1,205 mmradial equivalent: 280/85R28 (11.2R28)
Rear
16.9-34outside dia. 1,585 mmradial equivalent: 420/85R34 (16.9R34)

The tires on the tractor may not be original. A different size from the factory one can damage the transmission, especially on 4WD.

Also written as: Fiat 9090 · Fiat 90 90

Take it to your tire shop: tractor-size.com

4WD ratio check and other tools →

Source: tractordata.com (ikincil)

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