OK, my wheels are rusted out on my Yamaha Champ LC50, I know I can buy used replacements on ebay, but with shipping to my remote Canadian location it was going to be nearly $200 CAD which is insane. Also I was wondering about upgrades or disc conversions I found the idler pulley disc mount method on this forum and it is a decent option on a budget. But, I wanted to make my machine stand out a little and change it up. I have been obsessing over this for weeks and spent hours digitally measuring photos using the Pythagoras theory, counting pixels and gathering specs. Here is what I have discovered.
Yamaha Razz or Yamaha Riva rims should bolt up with out issue to the LC50 Champ. They share the same 16 spline rear drive axle and 10mm front axle. A spacer may be required for the rear wheel as they are designed for the CVT housing. They also use an EBC519 Brake shoe front and rear. I do not own either of these bikes and cannot prove this though.
PW50 wheels will not fit due to smaller spline shaft in the rear and smaller brake shoes. Also they are 3 spoke which I personally don't like. In theory if you love 3 spoke you could use the QT50 rear drive axle assembly with the PW50 wheel. and the whole front PW50 axle and brake assembly and wheel. This would lead to smaller brakes and even worse braking though.
Below are the full specs for the wheels and rims for the champ and Jog R/ZR I was very interested Jog R because there are some aftermarket options for wheels for this bike and the stockers are actually really nice. Note: The new Jog RR rims use the larger 18 spline shaft and will not fit.
Champ Front Rim / Wheel
10mm center shaft (AxleShaft)
10 inch rim x 2.15 inch width
Will fit a 10 x 2.5 to 10 x 3.5 tire
Drum Brake (EBC 519) 95mm Diameter x 25mm depth
Champ Rear Rim / Wheel
10 inch rim x 2.15 inch width
16 Spline count on centershaft
Will fit a 10 x 2.5 to 10 x 3.5 tire
Drum Brake (EBC 519) 95mm Diameter x 25mm depth
Spline diameter 17mm
Yamaha Jog R Front Rim
10 inch rim x 2.15 inch width
10mm centershaft (Axle Shaft)
Will fit a 10 x 2.5 to 10 x 3.5 tire
200mm front disc 57 mm 3 hole mount
Yamaha Jog R Rear Rim
10 inch rim x 2.15 inch width
16 Spline count on centershaft
Will fit a 10 x 2.5 to 10 x 3.5 tire
EBC 503 110mm x 25mm Brake Shoe
Armed with this info I pulled the trigger on some aftermarket Jog R/ZR rims from China and I am please to announce that they fit, but some adaption will be needed.
As you can see from the specs the rear drum for the Jog r has a 7.5 mm larger radius drum brake this means I have 3 options for the rear: figure out how to run bigger drum brakes, install a 7.5mm spacer in the rear drum to make it 95mm again or do the pulley disk brake conversion. I also have to put a small spacer on the axle shaft as the rim wants to rub against the driveshaft tube. Up Front I have to weld up a caliper mount and cut off the peg from the front for that keeps drum assembly in place.
I still have some work to do here, I have not ordered the large 200 or 220 mm disc brake kit yet as my research on this is not yet complete. When I get home tonight I will mount up the whitewalls and the front rim to check clearance for the disc, which I just held up as I didn't have time to mount it.
If you decide to use this information please be very careful. Yamaha scooter rims come in both 10mm and 12mm front axle shafts and the rear splines can be 16 or 18 count. Not to mention the smaller size of spline used on the QT50 and PW50. (edited)