The Tamiya 53975 - TRF501X spring pack gives three colour-coded pairs - Hard, Medium and Soft - so you can set rear compliance for different conditions. Swap springs between runs to find the best balance of turn-in and rear traction.
Colour coding makes it easy to tell spring rates apart at a glance, speeding up setup changes between sessions. Hard springs favour top-speed stability, medium are a good all-round option, and soft help where extra grip is needed.
These springs are produced to suit the TRF501X suspension layout, fitting into standard shocks and giving predictable handling changes when you change rates. They are a practical upgrade for racers and dedicated hobbyists.
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