Issues with traction on rear right tire only - Gravely ZT 60 HD

[neuro242]

Cleared roughly 4 acres on the first day with my new 2011 Gravely ZT 60 HD. Grass was dry. No rain in about a week. The ground has a slight slope as it's basically a cleared hill top. It did great except where I had the most slope. I landed in the ditch 3x. I know zero's aren't good on slopes but this is a slight slope and a neighbor has mowed it several times with his commercial grade scag with no traction issues. I found that even if I am on flat ground the back right tire slips with almost every turn. On the slight slope, it lost traction just on the right side and sent me down hill. Is this normal? Is it a tire size issue? Anyone else had this problem. I can't figure out why it's just the right tire. Maybe something I'm doing wrong... Comments greatly appreciated.

 

[Gil A]

Had slippage with original tires on my ZT60HD and installed a more aggressive tread tire on rear. Only a bit better than original. After installing learned from a friend who owns a commercial lawn service, that he had very good results with having rear tires filled with liquid weight. Have not yet done it but am considering it. Anyone out there tried it? What is results?

 

[neuro242]

Had slippage with original tires on my ZT60HD and installed a more aggressive tread tire on rear. Only a bit better than original. After installing learned from a friend who owns a commercial lawn service, that he had very good results with having rear tires filled with liquid weight. Have not yet done it but am considering it. Anyone out there tried it? What is results?

What tire did you go with?