I currently have an OFNA 18163 / 65T spur gear and I need to go to a lower tooth count. Info is hard to find with OFNA no longer producing.

I am seeing a lot of listings on EBAY but no tooth count it listed. Can anyone assist with a part number for a 50/55 etc with the same screw spacing as a 18163?

Don

OFNA was a distributor not an OEM, they rebranded cars from many different OEM's where the 2 most popular brands were HoBao and HongNor, both are still in production to this day, you just need to look for your specific chassis:

https://www.hobao-usa.com/product-category/rcparts/

http://www.rc-willpower.com/Cart/ind...y&path=487_495

You might be able to cross reference your part number on one of those sites!

I knew about HoBao but HongNor is news to me, thanks to much!

I will do some research and see if there are a compatible models from one of these companies.

There is fairly large hobby store a few miles from out house. I may make a drive and depending on who is working that day, I may get lucky. :-)

Didn't see any 65T gears on HoBao but found the following, does this look like your part?
G.V. Model 65T Gear #MV0651 [Mammoth] [Reely]

The link doesn't seem to be working. I'm hoping to find a gear with the same mounting a the OFNA 18163 but smaller (less teeth). With the 18163, the mount I am using will not adjust far enough to install a drive gear.

Willpower is located in China and takes a while to load, you need to be patient, just look for your car name to get the parts you need:

I was getting a "page cannot be reached" but it is working now. As you said, just takes time. Here is the OFNA 18163 gear. I may be out of luck and have to run the OE steal with the OE smaller tires.

Here is the OFNA 18163

Do you have the Ultra LX One?

https://www.ebay.com/itm/13387628461...2YVZ8AJ1YXSZ7B

I bought it off ebay years ago and was listed as a Ultra MBX R2. The manual I found seems to support this.

In that case I believe HongNor is the OEM and many of Ultra successors may offer compatible parts such as the spur I linked on post #8

Cool! Thanks for the tip and all your assistance on this one!

With your help and some research, I think I found an option! Will know in a week or so :-)

RC10B74 Center Diff Spur Gears, 72T/48P, 78T/48P

I don't think the AE gears will be compatible, they are for 1/10 buggy with 48P and that's not going to do very will with a 1/8 rig even if those holes line up and you can get it to fit

MOD 1 gears are significantly different and far more durable

I couldn't find specs on most gears as far as center hole diameter or mounting screw hole spacing. "If" these mount up I will be happy, even if they don't last, at least I can have some more fun with my old truggy. I had no luck finding MOD 1 spur gears that look like they would mount up. Most use a 3-hole mounting or do not have an open center hole. Options are a bit limited when converting from nitro to brushless. Option 2 would be completely replacing the center hub assembly.

facepalm... I've posted links to 2 different sources for compatible spur gears, good luck!

I very much appreciate all your help and I looked at every spur gear offered on both sites, 32 and 48P. None except the ones I posted even came close to the mounting needed to replace the current gear.

After reading further about others that have done similar conversions, I see what you are saying now. The HongNor LX-1/2 EP parts may do the trick! I have ordered a spur / pinion gear and have high hopes! The pricing was a little better on eBay than the HongNor site (same shipping location).

With much help from others here and some additional reading I finally completed the conversion.

nice job I have a jammin CRT that I converted ages ago using those same tires.
I stopped using it cause the tires would balloon up to where it looked like the truggy was on pizza cutters, and then it would flip due to air getting under it.

The tires do tend to "stretch" at higher speeds :-) but I really like the additional ground clearance the give when bashing through rocks and dirt-clods. And the wheel offset make it much harder to flip and 60-70 % of the time it lands right-side-up. :-)