HobbyPark Metal Steel Mod 1 Pinion Gear Set 5mm Shaft Hole 13T 14T 15T 16T Motor Gears Kit for RC Car (4-Pack)

These work great.Get yourself some and a 39 tooth spur gear for the losi lasernut u4

Never tried on monster trucks. I drive it on losi tenacity tt pro 3s, 16t pinion.Full throttle, rapid stops, jups withcounter wheel rotation landings - all good. But i have a centeral diff.

They don’t last long in the kraton 6s but they lasted long enough to figure out which tooth pinion gear I wanted to stick with and buy a heavier duty pinion gear

Nice made gears also to big for my application so didnt use them but I would order again if needed.

They work well in my Losi LMT roller that I powered with a Traxxas 540 XL brushless motor. No complaints.

Maybe I got a bad batch or something like that because the Amazon rating for these pinions are high. I got the Mod1 14t 5mm in my car for 2 days running on 4s and the pinion stripped to the point where there was almost no teeth left on it.

Got these today, fast shipping. Look nice, all black with lazer engraved sizes. Ran a dull old file lightly over the gear tooth, file digs right in. Not hard in any way, very soft steel. They will wear very quickly especially against the hardened spur in my Kraton EXB. They will work for mock up and testing purposes to find the ideal pinion gear for my style of driving. I will buy a Robinson Racing gear or 2 after I find which one keeps motor Temps nice and cool. Their gears are hardened and last forever, which is reflected in the price.

Just what I needed for my project with mod1 gears.