I may be wrong but i'm sure the TRF502X was Tamiyas first off roader designed with Lipo batteries in mind. There's no cell slots on the chassis and there's the option of having your lipo forward or rearward in the chassis depending on each individuals set up. I've never felt the need to add weights to mine, i did add weights to my 201 and it helped greatly but my 502x goes great without weight. Anyone done any running woith the kit springs but palyed about with different oils???
Thanks
Scotty....
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