byggd

I'm converting an old MBX R2 (truggy conversion years ago) to brushless. Neither 32P or 48P mesh with the spur gear. What pitch do I need?

1QwkSport2.5r

Was it electric to begin with?

byggd

No, it was a nitro buggy converted to a nitro truggy.

byggd

After much digging it turns out old "vintage" OFNA MBX R2 Nitro 1/8 buggy used 22P bell pinion / spur gear. No 22P 5mm pinion gear on the market that I can find.

bill_delong

I feel like a broken record:
https://www.rcuniverse.com/forum/12799530-post8.html

That link I posted is the most economical part that is likely compatible from the same OEM

According to this manual here for the Ultra MBX R2 they specify the stock spur as #31040
https://www.manualslib.com/manual/76...?page=6#manual

https://www.ebay.com/itm/175835724837

I've ran enough HongNor cars that chances are you may get a full diff to work as well if you measure the bearings and distance between the slots in the diff mount then ask someone on RC Tech to measure and confirm:
https://www.ebay.com/itm/255127759402

After you take your measurement (outer bearing to outer bearing) and verify bearing diameter, then ask someone on this thread to confirm measurements:
https://www.rctech.net/forum/nitro-o...in-x1-crt.html

byggd

I still have the original center diff and it includes the 31040 spur gear. When the truggy kit was installed, it included a solid shaft to replace the diff and an ONFA 18163 65T spur gear to compensate for the larger tires. Neither the 31040 or 18163 spur gears have a 32 (or 48) pitch. The bell clutch / 31040 and 18163 spur gears have a 22P. So purchasing the 31040 will not work when converting to brushless.

bill_delong

This is why I said it would be easier to swap out the entire diff with one that uses standard MOD1 gears

byggd

That would work, but I find a solid center diff works better for bashing! :-D