You can convert your Hammer Sledge from 2wd to 4wd using this kit. Please check this video to see the steps.
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These Cloud Wheel Rovers are special designed for Backfire Hammer and Sledge.
The rims on the wheels are special designed, which are different from other brands' 165R cloud wheels sold by the wheel manufactures. In other words, if you bought a set of 165R cloud wheels using 608 bearings from other sources, they do not fit with the hammer or hammer sledge directly.
The bearings to fir these wheels are size 6000 bearings to fit the 10mm truck axles, not traditional 608 skateboard bearings.
90mm orange stock wheels for Mini and ERA.
Backfire Halo remote is based on the 5th Generation Esc system, developed by Backfire, currently in use for Backfire Hammer Sledge only. However, it does not pair with other Backfire models on the 3rd generation system, and it is not compatible with other models on the market with Hobbywing or Lingyi esc either.
This 5th Generation remote is working with the 5th generation ESC, which does not pair with any other Backfire Models like G2, G3, X2 or X3, Nor first general ERA.