Bri

Which brand of gears and pitch do you recommend for USGT 21.5 class? I was thinking Robinson Racing gears look good but haven't really looked into the other brands.

Best regards,
Brian

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iTrader: (1)

in order to get down to the low FDRs needed, you'll want 64 pitch or 84 pitch gears. 64 are far more common than 84.

Robinson racing are not very good TBH. The pinions don't last very long. Cheap aluminum.

howardcano

iTrader: (37)

I use the Kimbrough spurs in 48 pitch, available down to 66 tooth. (Associated sells them cheaper, for some reason.) I use Robinson machined spurs for less than 66 tooth (they go all the way down to 49 tooth).

The Robinson 48 pitch steel pinions work well for me. I use their aluminum pinions for 35 teeth and above. I don't have wear issues, indoor or outdoor, but have run into a couple of the aluminum pinions where the holes for the set screw were not properly tapped.

locked

iTrader: (1)

I had a couple that quickly became serrated knives. This was back when I was racing 17.5 boosted though, so that is likely a big factor.

I mainly use CRC gold pinions and machined spurs from CoreRC, Titan, Leespeed and ARC.

CarbonJoe

I like 64 pitch PRS spurs and pinions.

http://www.precisionracingsystems.com/

BryceVR

Carpet use 64p if it's clean.
Outdoors use 48p. The grit will chew out 64s in a few sessions.
If in doubt use 48p I use Kimbrough spurs and Robinson pinions and have no trouble in 30 yrs. (apart from my own inability to check the mesh properly)
You really only need 64p to fine tune roll out on foams. Until you're at that level 48p is good enough to get close.
48p will handle a lot more power.

Here's the foolproof perfect way to set a mesh.

Loosen the motor.
Put a cigarette paper between the spur and pinion.
Squeeze the pair of gears together hard and tighten the motor.
Goose it to spit the paper out and you'll have a perfect mesh, every time.

Cheers