9.00-13 Tyres

[Alex van de Wetering]

So, what Ply rating is suitable for a 8cwt truck....C8/F8/Morris PU???

Until last week I presumed that the higher the ply rating the better.....but now I noticed that even though the allowed maximum weight increases along with the ply rating....the maximum allowed speed actually goes down.

Any thoughts on this?



It seems that most of the available 9.00x13 tyres (yes, all farm trailer tyres) are rated at 40/50 km/h maximum speed. The 6 ply BKT Sand Star is rated at 65km/h max, with max. 1000kg load.


Available 9.00x13 tyres and available Ply ratings:

Alliance 223
PLY: 8, 10 or 12.......all rated "A8"= 40km/h....but table also mentions 50km/h
http://www.atgtire.com/nl/ShowAllian...ls.aspx?id=734

BKT Sand star (ex Olympic pattern)
PLY: 6, 8, 10............first is rated "D"= 65km/h, the others "A8"= 40km/h
https://www.bkt-tires.com/en/pattern/sand-star

Harvest Sand Star (ex. Olympic pattern)
PLY: 6 ........rated "A8" = 40km/h
http://harvesttyres.com.au/index.php...nd-grip-detail

Trelleborg AF302
PLY: not known........rated "A8" = 40km/h....but table also mentions 50km/h
http://www.trelleborg.com/en/wheels/...tandard--af302

MRF Sand grip
PLY: 6...no speed mentioned
http://www.mrftyres.com


Info on tyre codes: https://en.wikipedia.org/wiki/Tire_code