HB D819RS

Q&A, setups, gearing, kit settings, manual, and guides

Off-road•Buggy•1/8 scale•4WD•Nitro

D819RS parts & upgrades at AMain →

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Setups

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Danny Smith

The Hammer's base setup

Track: Warehouse Hobby Raceway · Indoor Clay · Medium grip
Event: Practice · Jun 13, 2026

Robert HerronJT Bearing

My Base Setup

Track: STR Raceway · Outdoor Loose/loamy · Medium/Low grip
Date: Jun 13, 2026

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Gary Wright

Sandpit Oct 2022 indoor

Track: Sandpit · Indoor Loose/loamy · Medium grip
Event: Points series · May 23, 2026 · 2nd, Main 2

Gary Wright

2nd place @ Clark RC

Track: Clark Rc 8-16-2020 2nd Place Finish · Outdoor Loose/loamy · High grip
Event: Rona round 3· May 23, 2026

Gary Wright

Super easy drive 2026

Track: Thunder Road Hobbies· Outdoor Loose/loamy · Medium grip
Event: Points series RD2· May 23, 2026 · 2nd, Main

Gary Wright

Indoor clay setup v1 2021

Track: RC Fun Park· Indoor Clay · Medium grip
Event: Trophy Race · May 23, 2026 · 2nd, Main 2

Cameron DePaolo

HB D819RS <70°

Track: Loganville RC Complex· Outdoor Clay · Medium grip
Event: Club Race· Aug 3, 2022

Cameron DePaolo

HB D819RS 70°~80°

Track: Loganville RC Complex· Outdoor Clay · Medium grip
Event: Club Race· Aug 3, 2022

Cameron DePaolo

HB D819RS >80°

Track: Loganville RC Complex· Outdoor Clay · Medium grip
Event: Club Race· Aug 3, 2022

Jon SpencerEvolution Models

Starting Setup

Track: General· Outdoor Hard-Packed · Low grip
Event: N/A· Aug 3, 2022

Joe Scales

Outdoor base

Track: Mundays Raceway· Outdoor Hard-Packed · Medium grip
Event: NCT round 47· Aug 3, 2022

Gary Wright

Clark RC Park 2021 finals

Track: Clark RC· Outdoor Hard-Packed · Medium/Low grip
Event: Black Jack Series 2021 Finals· Jul 7, 2022 · 3rd, Main

Gary Wright

Outdoor rough Thunder Road

Track: Thunder Road Hobbies · Outdoor Loose/loamy · Low grip
Event: Club race season opener · May 30, 2021

Kyle Johnson

NCT 2020 Round 1 @Lynden FairGrounds

Track: Lynden FairGrounds· Outdoor Loose/loamy · Low grip
Event: NorthWest Championship Tour· May 30, 2021

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Gearing

Stock gearing for the HB D819RS, with common pinions and their ratios.

Stock spur

48T

Internal ratio

3.308:1

Typical pinion

1800–2300 Kv ≈ 16T

Class medians on the stock spur. For your motor and track →

Pinion	Spur ÷ pinion	FDR
12T	4.00	13.23
13T	3.69	12.21
14T	3.43	11.34
15T	3.20	10.59
16T	3.00	9.92
17T	2.82	9.34
18T	2.67	8.82
19T	2.53	8.36

Shaded rows are the pinions most 1/8 4WD buggy setups run on the stock spur.

What pinion should I run?

Tell us your motor and track and get a starting pinion for the HB D819RS, with the range racers in the class run.

Get a recommendation →Shop pinion gears at AMain →

What pinion gear should I use on the HB D819RS?

It depends on your motor and the track. In the 1/8 4WD buggy class, racers gear by final drive ratio: 1800–2300 Kv near 10.06. On the D819RS's stock 48T spur that is about 16T for 1800–2300 Kv. Tight tracks gear down, open tracks gear up. For a starting pinion matched to your motor, use the So Dialed Pinion Recommender with the D819RS selected.

What is the internal ratio (transmission ratio) of the HB D819RS?

The D819RS has an internal ratio of 3.308:1. Final drive ratio = spur ÷ pinion × 3.308. With the stock 48T spur, a 12T pinion gives an FDR of 13.23 and a 19T gives 8.36.

How many teeth is the stock spur gear on the HB D819RS?

48 teeth. Changing the spur moves every pinion's ratio at once; most racers leave the spur and tune with the pinion.

Kit setup

Kit shock setup. Part numbers link to AMain.

Shock oil

Front: 35 wt
Rear: 27.5 wt

Team Orion oil

Springs

Front: Gold 79.6gF #109810 →
Rear: Blue 61.6gF #109814 →

Pistons

Front: 6 x 1.3mm
Rear: 6 x 1.3mm

Diff fluid

Front: 7,000 cst
Center: 5,000 cst
Rear: 2,000 cst

What shock oil does the HB D819RS come with?

Out of the box the D819RS runs 35 wt front, 27.5 wt rear (Team Orion oil), on 6 x 1.3mm front, 6 x 1.3mm rear pistons. That is the kit setup; you will need to adjust it for your track conditions. The RC Setup App can help dial it in.

What springs does the HB D819RS come with?

The kit springs are Gold 79.6gF (#109810) front, Blue 61.6gF (#109814) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.

What diff fluid does the HB D819RS come with?

The kit diff fluid is 7,000 cst front, 5,000 cst center, 2,000 cst rear. Thicker front adds steering on power; thicker center sends more drive rearward; thicker rear stabilizes the car under throttle.