DeathVirus
Pebble Pounder
Yeti vs Rock Rey
Comparing almost apples-apples I’ve locked the diffs on both Yeti and Rock Rey, run on 3s 5000mah packs and on 2.2 Proline Hyrax’s with single-stage foams. My default terrain is grass. I’ve lowered the hearing by 2 teeth on the pinion on each truck from stock bc I felt they felt overgeared for 3s out of the box.
Climbing- I had assumed the Yeti was the better climber bc the stock Servo is so slow on the Rock Rey and bc the Rock Rey cogs so badly but upon further inspection I realized the Yeti has a more forward weight bias which helps tremendously in crawling situations
Handling- the more balanced forward-to-rear weight bias of the Rock Rey helps it handle much better. Also, the metal chassis does add weight down low which keeps it more planted and it usually lands back on its feet if it does roll over. The motor and the batter are also in lower positions than in he Yeti which gives it a lower center of gravity.
Suspension- the Rock Rey out of the box has almost-spot on suspension settings. I did raise it up a little because it was sitting a little low but it handles rough terrain very well. I had to stiffen the front Yeti shocks to 60wt oil from the stock 30wt bc it just wasn’t enough. 60wt in the front of the Yeti is the sweet spot to me. The turning radius is much better in the Rock Rey as well even with the locked diffs. I didn’t upgrade any of the steering components in either truck. The Rock Rey’s wheels wobble when turning at full lock. I suspect it’s the stock flexible steering linkages. This does not happen with the Yeti. I’ve kept them both stock bc there’s no Servo saver and these trucks are for my 6yr old boys.
Electronics- the Yeti has a smoother power delivery, cogs much less, and is also quieter. The Castle system is nice and highly adjustable. The Rock Rey’s system is obnoxious even with the lowest start mode. It has ridiculous power and insane acceleration BUT if both had the same punch setting the Yeti will wheelie or flip over faster. It might be due to the Rock Rey having stiffer rear springs.
The stock servos are crap but I feel the Yeti has the better one although its analog and also weaker. It’s faster by a little on paper but seems much faster when you’re actually driving it. Analog 143oz/in @.21s for the Yeti vs Digital 161oz/in @.24s for the Rock Rey and yet the Yeti seems much faster
Transmitter- the Yeti has a much better RTR transmitter. The foam feels nice and firm on the wheel and the trigger gives you feedback. The Rock Rey has just a plastic wheel and has zero trigger-feel. You feel very disconnected when driving it.
Of course by design the Bomber was the best crawler. No rocks here but lots of roots. The Rock Rey had the best handling hands down and was also the fastest and quickest even with the lowest punch setting. The Yeti was in between- climbed better than the Rock Rey but faster and handled better than the Bomber. The Yeti and Rock Rey had almost-locked diffs with silly putty (17 billion CST) and used Proline single stage foams with 2.2 Hyrax tires. The Bomber has Proline dual-stage foams with vented 2.2 Hyrax tires. All wheels had vent holes open.
If all upgrades were equal, electronics (Tekin RX8+HH Puller Pro/Hitec Servo), shocks, steering components and suspension links, I believe the Yeti would be faster around a U4RC track. Around a short course track with diffs unlocked I believe the Baja Rey is faster than a Yeti Score though.
The Bomber is mine. The Yeti and Rock Rey are for my twin 6yr old boys. They’re pretty good considering they’re scale vehicles and started them off with monster trucks when they were 4.
Last edited:
