New Holland TT60 Classic tire size

What do the New Holland TT60 Classic tyre sizes mean?

14.9-28 is an inch-sized tyre: section width about 14.9 inches, rim diameter 28 inches. The dash (-) marks bias (cross-ply) construction. Outside diameter is about 1,365 mm.

6.50-16 is an inch-sized tyre: section width about 6.50 inches, rim diameter 16 inches. The dash (-) marks bias (cross-ply) construction. Outside diameter is about 760 mm.

380/85R28 is a radial tyre: section width 380 mm, sidewall height 85% of the width, rim diameter 28 inches. The “R” marks radial construction. Outside diameter is about 1,350 mm.

280/85R20 is a radial tyre: section width 280 mm, sidewall height 85% of the width, rim diameter 20 inches. The “R” marks radial construction. Outside diameter is about 989 mm.

380/70R28 is a radial tyre: section width 380 mm, sidewall height 70% of the width, rim diameter 28 inches. The “R” marks radial construction. Outside diameter is about 1,297 mm.

300/70R20 is a radial tyre: section width 300 mm, sidewall height 70% of the width, rim diameter 20 inches. The “R” marks radial construction. Outside diameter is about 954 mm.

In this pair the rear tyre's outside diameter is about 1.37 times the front. On 4WD tractors the front-to-rear tyre ratio must match the driveline ratio, so keep it when changing tyres.

63 other New Holland models use the same rear size (14.9-28).

Read more: How to read a tyre size · 4WD front–rear tyre ratio · Tractor tyre pressure