spur gear

[twholland]

i was wondering, what size spur gear are you guys running. i'm looking into buying a different size for my 2.5, but i'm not sure which one(s) to get. currently running 72 tooth, but i want to get a little more speed without loosing too much torque. thinking 70 or 68 tooth, but even considering 66.

 

[NCNitro]

I am all about the torque and low end grunt. So I run 72 tooth spur with an 18 tooth bell.

Remember though that there is always a trade off, to get more top end you will lose some bottom end, to get more bottom end you will lose some top end.

 

[twholland]

will more bottom end give me a faster start off the line? what is the stock bell tooth size?

 

[StrechM]

It is a 20 tooth

Here is parts list, top of the page.

http://www.traxxas.com/products/prod_menu_imgs/parts_pdf/T-Maxx25-Parts-list-030624.pdf

 

[SuperMaxx97]

i run a 24t cb and a 72t spur. i am going to change the spur to about a 66 or something aroudn there. My XTm engine has way too much torque for me off the line so i figured i would take that torque and make it for speed!!

bryan

 

[NCNitro]

But you are comparing big blocks to small blocks. He has a 2.5, you have a XTM big block, it would be geared differently.

 

[ImBroken]

A 73t Kimbrough Spur & 20t clutchbell is a nice combo for what your looking for....

 

[SkyMaxx]

Here's a good link on the basics of spur to clutch bell gearing and what various ratios might get you.

https://www.rcnitrotalk.com/reviews/ratio.htm

 

[SuperMaxx97]

o, sorry i forgot about that one.

bryan

 

[twholland]

thanks for all the good info, i went ahead and bought a 68t & 70t spur gears and a 19t clutch bell. i figured that i can swap gears around and see what i like plus i still have the stock 20t CB, so i can either have high torque or high speed or somewhere in the middle. thanks again!

and that gear ratio chart really helped!