Hot Racing heavy brass modular outer portal drive housings for the front of the TRA TRX-4 crawler. Adds weight to the TRA TRX-4 crawler where it needs it - down low. Adds around 72g per hub to lower the vehicle's center of gravity, increase its stability, improve climbing, reduce the chance for flipping backwards, and make it an overall more capable crawler. The modular design allows the addition of Hot Raqcing TRXF21HWR (47g Brass Inner Modular Weight) and/or TRXF21HWF (21g Brass Outer Modular Weight) to be added to further tune the vehicle's performance.

- CNC machined solid brass billet
- Adds around 72g per hub to the lowest location of the vehicle to lower its center of gravity, increase its stability, improve climbing, reduce the chance for flipping backwards, and make it an overall more capable crawler
- Compatible with Hot Racing modular weights: TRXF21HWR 47g Brass Inner Modular Weight, TRXF21HWF 21g Brass Outer Modular Weight
- Includes three position settings for optional TRXF21HWF 21g Brass Outer Modular Weight to fine tune weight position
- Direct replacement for factory plastic components
- Two (2) modular brass outer portal drive housings
- Medium thread lock (blue threadlocking compound) on screws
- Weight: 72g/each (stock is around 3g/each)
- Outside diameter: 39mm
- Replaces factory plastic TRA 8251, Front or Rear Outer Portal Drive Housing
- For the complete modular set, see Hot Racing TRXF21HA
- For add-on modular weights, see Hot Racing: TRXF21HWR 47g Brass Inner Modular Weight, TRXF21HWF 21g Brass Outer Modular Weight

description revised by: SN August 27, 2018