Accurate Armour Challenger 2 replacement road wheels. A073
The wheels are cast in a light grey resin with 2 wheels attached to a casting block, each casting block has one inner and one outer wheel. The wheels come free with a sharp knife and need just a little cleanup, a little care is needed to make sure that each inner and outer wheel are centred with each other, then they are straight replacement for the kit wheels. The 2 idler wheels in my set had just a small amount of flash on but this is easily cleaned up. I ordered mine direct from Accurate Armour and on arrival 2 of them were smashed (clumsy postman rather than poor packaging), but with one quick phone call to Accurate Armour I had 2 replacement wheels in 2 days.

Accurate Armour Challenger 2 replacement Tracks and Drive Sprockets. T68
The tracks come in 10 lengths of 18 links and 18 single links cast in a light grey resin. They will need to be slightly heated as the lengths have a slight warp in them, but after some gentle heat had been applied they are easily straightened. The drive sprockets are cast in white metal and also include a new resin collar to replace the plastic one in the Trumpeter kit.
Note:
When it came time to build the kit the sprocket wheels were to narrow for the track by 2.5 mm. A quick phone call to AA had a set of replacement sprockets on the way. Thanks guys.

Conclusion
Both of these sets go a way to replace the poor parts in the Trumpeter kit. The wheels were an easy replacement but the tracks needed a bit more skill to use but once on look the part. I look forward to seeing some of the other Challenger 2 sets that Accurate Armour are doing.