996 4wd rear wheels and tyre size?

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780farmer
Posts: 19
Joined: Sat Nov 19, 2016 5:46 pm
Location: Exmoor

996 4wd rear wheels and tyre size?

Post by 780farmer » Tue Jun 27, 2017 9:13 pm

Hello i have just bought a 996 4wd with a 1210 engine fitted, for some reason 1 side the tyres are good and the other side are bald, but its running 38" on the back, 1 looks original and the other is nearly new, ive been told it ought to be on 36"s what is the right size and will it effect the tractor?

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mart1602
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Location: pembs
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Re: 996 4wd rear wheels and tyre size?

Post by mart1602 » Tue Jun 27, 2017 9:28 pm

your tractor should not be on 38s ,its all about front and rear combinations if they are wrong it will wind up the gear box and cause it to fail

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ollek
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Re: 996 4wd rear wheels and tyre size?

Post by ollek » Wed Jun 28, 2017 5:07 am

The tyre combination for a tractor with David Brown front axle should be Front 11.2-24 and Rear 16.9.34. The combination for tractors With Selene front axle is Front 9.5-24 and Rear 12.4-36. Other combinations can be possible, provided that the percentage difference in the rolling radius is the same between front and rear. Ask your tractor tyre garage to calculate combinations that can be used. The lead between front and rear shall be between 1 and 4 per cent. The rolling radius for a 16.9-34 is near the same for a 13.6-38. These figures however changes between tyre brands and need to be confirmed by a professional tractor tyre shop.

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