Rchobbytop 17mm Hex Adapter Extenders - 30mm Length, 34mm Total Width Increase for 1/8 RC Cars (4 Pack)
Rchobbytop 17mm Hex Adapter Extenders - 30mm Length, 34mm Total Width Increase for 1/8 RC Cars (4 Pack)
These four aluminum 17mm hex adapters from Rchobbytop add 17mm of width per side to your 1/8 scale RC car, for a total increase of 34mm. Each adapter measures 30mm long and fits 17mm hex hubs with 8mm axles. The set includes anti-dust cap nuts, steel pins, and O-rings to keep the pins in place. The anodized aluminum construction is lightweight yet durable, designed to improve stability and cornering.
What's in the box?
- 4 x hex adapter extender
- 4 x anti-dust cap nut
- 4 x steel pin (2.5mm diameter)
- 4 x rubber O-ring
Key dimensions
| Extender length | 30mm (not including threaded end) |
| Width increase per side | 17mm (0.67 inch) |
| Total track width increase | 34mm (1.34 inch) |
| Hex size | 17mm |
| Axle hole diameter | 8mm |
| Pin diameter | 2.5mm |
| Thread pitch | P1.0mm |
| Material | Aluminum alloy with anodized finish, steel pins |
| Package weight | 1.72 ounces (48.8 grams) |
Which RC cars are compatible?
These adapters are designed for most 1/8 scale RC cars that use 17mm hex hubs and 8mm axles. Compatible models include many from HoBao (MT, 8SC, H9, T8E, EMTA), HSP 94087, Kyosho, Traxxas (select models), Yeti XL, and Proline. They are not compatible with models that have different hex sizes or axle diameters, such as the Traxxas E-Revo/Summit, HPI Savage Flux HP, Arrma Granite 3s/Typhon 3s, Losi 8, or Redcat Shredder. Always verify your car's hex size and axle diameter before ordering.
How does the wider stance help?
Widening the track reduces body roll during turns, giving the car a more stable cornering feel. The lightweight aluminum adds minimal unsprung weight, so acceleration and suspension response are largely unaffected. The anti-dust cap nuts help keep dirt and debris away from wheel bearings during off-road driving.
Installation tips
The O-rings are optional — they help keep the pins in place but can be left out if you prefer. Installation is straightforward: remove the existing wheels, slide the adapter onto the axle, secure it with the anti-dust cap nut, and mount the wheel. Make sure the steel pin passes through the axle hole properly.
Common questions about these 17mm hex adapters
Do the adapters come with nuts?
Yes, each set includes four anti-dust cap nuts, four pins, and four O-rings — everything needed for installation.
What is the total width increase on one side?
Each adapter extends the wheel out by 17mm (0.67 inch) from the original hub, so the total track width increases by 34mm (1.34 inch) across both sides.
Can I use these on a 1/10 scale car?
These are intended for 1/8 scale models with 17mm hex and 8mm axle. Compatibility with other scales depends on the hex size and axle diameter of your car.
With a customer rating of 3.9 out of 5 stars from 47 reviews, these adapters are a practical choice for RC enthusiasts looking to improve stability and stance. Recommended for ages 14 and up.