Typically, tire sizes for a R75/5 R90/6 R90s R100S, etc will have a:
3.25 x 19 Front
and
4.00 x 18 Rear
The metric metric equivalents would be 90/90-19 for the front and 100/90-18 or possibly 110/90-18 for the rear.
]]>The image descriptions have notes on the disassembly.
Final Drive missing a spring Final Drive brake shoes removed The next step is holding the drive gear in place, flattening this washer down, and removing this nut with a good impact gun. Nut off Gear removed BMW tool used to remove the threaded ring inside this shaft area Threaded Ring removed with seal inside. Seal Removal 28x55x9 Part number 33 12 1 231 542 Note the orientation of the shoulder of this washer Notice the orientation of the shoulder on the washer removing that large washer Removal of the M8 nuts with a 13mm socket Removal of the M8 nuts with a 13mm socket I’m pretty sure this was a M5 screw I had lying around. Ignore the red locktite looking stuff at the tip. These screws are needed to push the cover off the housing. Two halves apart Notice the shim/washer. Also take note of that small pin in the casting just above the gear. That pin needs to be removed to remove the needle bearing nested inside the housing. There is that same shim from the last photo Press out the axle bushing/tube bushing comes out this side Differential gear is next Press out the differential / crown gear Notice the giant shim/washer Press out the seal from the cover plate. Press out the seal from the cover plate. 65X85X10 part number 33 12 1 233 528 spring side goes towards the oil. This housing was put in the oven at 350 degrees for about 20 minutes Removed gear and bearings – HOT TO TOUCH!!! They practically fell out of the housing Unfortunately this pin broke preventing me from removing the bearing. It is common from what I understand. I ended up covering it up with silicone to prevent media from getting at it when blasting. Seal Removed – 30x42x7 part number 33 12 3 004 337
