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 RC8 B4.1e's stock 47T 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 RC8 B4.1e selected.

What is the internal ratio (transmission ratio) of the Team Associated RC8 B4.1e?

The RC8 B4.1e has an internal ratio of 3.385:1. Final drive ratio = spur ÷ pinion × 3.385. With the stock 47T spur, a 12T pinion gives an FDR of 13.26 and a 19T gives 8.37.

How many teeth is the stock spur gear on the Team Associated RC8 B4.1e?

47 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: 45 wt
Rear: 30 wt

Team Associated oil

Springs

Front: 5.1lb White #81223 →
Rear: 3.7lb Pink #81233 →

Pistons

Front: 6x1.4mm flat #81597 →
Rear: 6x1.5mm tapered #81598 →

Diff fluid

Front: 15,000 cst
Center: 10,000 cst
Rear: 10,000 cst

What shock oil does the Team Associated RC8 B4.1e come with?

Out of the box the RC8 B4.1e runs 45 wt front, 30 wt rear (Team Associated oil), on 6x1.4mm flat (#81597) front, 6x1.5mm tapered (#81598) 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 Team Associated RC8 B4.1e come with?

The kit springs are 5.1lb White (#81223) front, 3.7lb Pink (#81233) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.

What diff fluid does the Team Associated RC8 B4.1e come with?

The kit diff fluid is 15,000 cst front, 10,000 cst center, 10,000 cst rear. Thicker front adds steering on power; thicker center sends more drive rearward; thicker rear stabilizes the car under throttle.

Setup Help

All 1/8 Off-Road Cars →

Reference chart — 1/8 Off-road

Oil Comparison Chart

Reference chart — 1/8 Off-road

Free to start · iOS & Android

Setup App & Race Log

Your Team Associated RC8 B4.1e is in the RC Setup App

Save every setup change you make to your Team Associated RC8 B4.1e, get AI tuning answers for that exact car, and log your races — at the track or back in the pits.

Setup Tracking
AI Mechanic answers
Find & Share Setups
Race Log
Gear Ratio Calculator
Free to use

See what it does →