I need help!!

[RADIAL-FPV]

Hello, I know quite a bit about r/c I have been doing r/c for 2 and a half years now, but my usual is building and racing drones. I have had a HPI Savage 21 for about 3 years now, and have only driven it, 8 times, my father knows a lot about them and he had a go and did a little bit of tweaking to it, to make it perfect. My issue is that the spur on the side of the gearbox has been rounded off, I don’t know what size I need, and what is the better one to buy, if anyone has any idea please send links, that would be so helpful.

 

[X]

If it is stock, it looks like it had a 52T spur.

https://www.hpiracing.com/en/part/76942?show_disc=true

If you are looking to upgrade, Robinson racing make great replacements. I would recommend replacing both the spur and clutch bell if you do that. They even have a stock gear ratio setup package you can buy. Many though use that 48/16 combo.


http://www.robinsonracing.com/catalog/savage21-25.html

 

[RADIAL-FPV]

THAnk you ever so much, I have looked at upgrading, hats actually what I was looking for

 

[parks450]

I used the 47/17 combo from hpi, its a vented and hardened clutch bell and hardened spur gear for relatively cheap. But as stated, Robinson makes a nice set up to

 

[thesmilingpirate]

I just upgraded to the Robinson 47T steel spur gear and Robinson 17T hardened clutch bell.