-
Welcome to RCTalk! 🚀
Join the #1 RC community where hobbyists connect, share, and get expert advice on RC cars, trucks, boats, drones, and more!
- ✓ Friendly & passionate RC enthusiasts
- ✓ RC tips & troubleshooting
- ✓ Buy, sell & trade RC gear
- ✓ Share builds & upgrades
New to the xrt
- Thread starter jayarr55
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
links, including eBay, Amazon, and others.
WickedFog
Starter of too many projects. Oh look... SQUIRREL!
Community Leader
Supporter
Excellence Award
Hospitality Award
Build Thread Contributor
RC Showcase: 9
- Messages
- 28,226
- Reaction score
- 53,130
- Points
- 2,740
- Location
- Terre Haute, IN
- RC Driving Style
- Bashing
- Crawling
- Scale Builder
So is your stock gearing a 20t pinion with a 50t spur? And it should be mod 1.0 gearing. Are you going with a bigger pitch, like mod 1.5?
Stock gearing should be Mod 1.0, and should be 20t pinion and 50t spur.
If going to Mod 1.5 the equivalent would be 14t pinion and 35t spur.
I don't have an XRT. Just going off gear calculations. Verify they will fit and you have proper adjustability on your motor mount.
Stock gearing should be Mod 1.0, and should be 20t pinion and 50t spur.
If going to Mod 1.5 the equivalent would be 14t pinion and 35t spur.
I don't have an XRT. Just going off gear calculations. Verify they will fit and you have proper adjustability on your motor mount.
Last edited:
- Thread starter
- #3
Hey, thank you.
Yes stock is 20t pinion and 50t spur.. I do have the optional gearing on though wich is 23t pinion and 46t spur.. what would be the equivalent to that??
Is there a way to get faster?
Thank you for your help!
- Thread starter
- #4
Oh and yes, am changing to mod 1.5 gears..
WickedFog
Starter of too many projects. Oh look... SQUIRREL!
Community Leader
Supporter
Excellence Award
Hospitality Award
Build Thread Contributor
RC Showcase: 9
- Messages
- 28,226
- Reaction score
- 53,130
- Points
- 2,740
- Location
- Terre Haute, IN
- RC Driving Style
- Bashing
- Crawling
- Scale Builder
15t pinion and a 35t spur would be a little faster. I would just get a few pinions and try to see where you like it. Just make sure to monitor your temps.
- Thread starter
- #7
Thank you for your help.. I honestly had no idea what gears to go with and was going to shoot from the hip and pray for the best..
WickedFog
Starter of too many projects. Oh look... SQUIRREL!
Community Leader
Supporter
Excellence Award
Hospitality Award
Build Thread Contributor
RC Showcase: 9
- Messages
- 28,226
- Reaction score
- 53,130
- Points
- 2,740
- Location
- Terre Haute, IN
- RC Driving Style
- Bashing
- Crawling
- Scale Builder
I was just suggesting similar ratios to stock, which stock is 2.5:1. The 15t/35t 1.5 Mod gearing would give you 2.33:1, and be a bit faster. That HW motor should be able to handle more, so you may be able to get away with a 20t pinion.
There are a lot of things that come into play. The weight of the vehicle, the terrain you're driving it on (tall grass, dirt, concrete, etc), the ambient temperature, your driving style, etc will all affect the motor and ESC temps. Nobody can tell you the exact gear that you can use. Your best bet is to buy a few and see what you get. Maybe buy a 14t, an 18t, and a 20t pinion with the 35t spur and see what does what.
To calculate your ratio - stock pinion is 20t. Stock spur is 50t. Divide 50 x 20 and you get 2.5. So your pinion turns 2.5 revolutions to one revolution of the spur.
The smaller that number, the faster your RC will go, until it reaches the point the motor is struggling and overheating.
Another thing to consider is the gear diameters. Different mods will be different. You need to keep in mind your motor can only move so far. Get the wrong gearing, and you won't be able to use them. Since a 35t spur seems to be the standard in 1.5 Mod gearing for that kit, I'd start there.
To check the diameters of your gears, you can use this.
https://evolventdesign.com/pages/bl...djaTdajBOjImT7GHSK_QIRFvv1JgdbpFxkOdieGiKa180
Pay attention to the OD reference dimension.
RC gears typically use a 20° pressure angle, so always use that.
There are a lot of things that come into play. The weight of the vehicle, the terrain you're driving it on (tall grass, dirt, concrete, etc), the ambient temperature, your driving style, etc will all affect the motor and ESC temps. Nobody can tell you the exact gear that you can use. Your best bet is to buy a few and see what you get. Maybe buy a 14t, an 18t, and a 20t pinion with the 35t spur and see what does what.
To calculate your ratio - stock pinion is 20t. Stock spur is 50t. Divide 50 x 20 and you get 2.5. So your pinion turns 2.5 revolutions to one revolution of the spur.
The smaller that number, the faster your RC will go, until it reaches the point the motor is struggling and overheating.
Another thing to consider is the gear diameters. Different mods will be different. You need to keep in mind your motor can only move so far. Get the wrong gearing, and you won't be able to use them. Since a 35t spur seems to be the standard in 1.5 Mod gearing for that kit, I'd start there.
To check the diameters of your gears, you can use this.
https://evolventdesign.com/pages/bl...djaTdajBOjImT7GHSK_QIRFvv1JgdbpFxkOdieGiKa180
Pay attention to the OD reference dimension.
RC gears typically use a 20° pressure angle, so always use that.
- Thread starter
- #10
Understood... thank you!
- Messages
- 682
- Reaction score
- 2,357
- Points
- 350
- Location
- Binghamton, New York
- RC Driving Style
- Bashing
- Crawling
I run 24/35 in my XRT with a Max5 1100kv. My Xmaxx has Max6G2 1250KV geared 20/35. Both have crazy cooling though
- Thread starter
- #12
Sounds crazy... what do you use for cooling?
- Messages
- 682
- Reaction score
- 2,357
- Points
- 350
- Location
- Binghamton, New York
- RC Driving Style
- Bashing
- Crawling
My rigs are very modified. I run Hyperflow fans. Zero overheating issues
- Thread starter
- #14
Sheeesh!
- Thread starter
- #15
Sheesh that is sweet nice fitment too
- Messages
- 682
- Reaction score
- 2,357
- Points
- 350
- Location
- Binghamton, New York
- RC Driving Style
- Bashing
- Crawling
Thank you, it is a very nice fitment. Pricey but worth it in my honest opinion
- Messages
- 682
- Reaction score
- 2,357
- Points
- 350
- Location
- Binghamton, New York
- RC Driving Style
- Bashing
- Crawling
Stock servo does suck. Before you even upgrade the servo I’d highly recommend upgrading the servo saver/bellcrank. I run TRAXXAS aluminum bellcrank in my Xmaxx and XRT. I also run the traxxas 2085R servo in both rigs, it also comes with a stiffer spring you can install to the servo saver. People will say don’t buy traxxas and that it’s overpriced but I have had zero fitment issues, I did have a faulty servo but traxxas warrantied that with no problems. I also broke the plastic tab mounts off the 2085R servo from a massive chassis slap, but GPM has an aluminum case for it that I have since upgraded to. M2C also made a support to prevent breaking the tabs off. If you want a drop in that’s better than the 2085R I’d highly recommend the perfect pass monster T servo.
