I've had Alans recovery tracks for a few days now and have finally found time to report back. No road test yet though, just a general description.
Tracks are packaged in a cardboard box marked 'Made in Taiwan PRC', it's pleasing to see that not everything is made in mainland China.
They weigh in at 5.7kg each, are 1500mm long and 430mm wide at the widest point. They have four large oval holes as mounting points and to strap together with the supplied Velcro straps. The plastic material seems very tough using a screwdriver test.
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The photo shows a top and underneath view of the tracks they seems well ribbed but if they fill with mud it's going to be a heavy lift.
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The individual 'lugs' on the track sit 9mm high and are pointed. Spacing ranges between 40mm~25mm depending on its position.
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This image gives a view of the track next to the largest/strongest tracks I had previously been able to find. The vehicle in the background is a Land Rover 6x6 with a 950mm axle spacing and 235 85 R16 tyres and I think the tracks will usable even in a 2 axle situation. The yellow tracks in the photo could be strapped together to make a single long track but I don't think that will be possible with these new ones but they are plenty long enough for a large 4x4.