To be pedantic, there are 2. The outer is the C-clip (spring-steel) sitting on top of the outer bearing/ outer race...the other one is a small alum washer sitting between the two inner races to space them out the same as the outer races are spaced by the C-clip. The C-clip is FRACTIONALLY thinner than the factory-alum washer/ spacer .....the difference is easily made up by the tolerance/ slop in the bearings. I prefer alum for those spacers/ spacer tubes as the softer material allows some "give/ yield" to get the tools to bite, rather than everything being S/S making things hard to impossible for a backyarder's fix/ on-road fix, requiring pro tools and equipment ....each to their own, as always.
It's single right for existence. Just like on any other bike....all the spacers, tubes + inner races are near flush to each other creating a continuous sleeve for the axle to sit in. The rear hub has 2 bearings #6203, the sprocket carrier has two bearing #6204. As for a detailed "stacking" of parts, check tables / drawings 42 and 43 in the parts manual. (Strada/ Terra resp.)
This is the perfect time for those who wish to check their bearings to go in and help the discussion. I have had mine apart and resolved (sortof resolved) the issue, for me to pull my bike apart to take pictures is just extra work. But for those who have not, this is a good time to check your bearings before your hub disintegrates. While you are in there, take pictures of the spacers, bushings bearings etc. Try and figure how the forces are distributed along the axle in a continuous manner. Clean, measure inspect and report back. If this were not a problem, there would not be so many failures. <----remember this
When I looked at the totally disintegrated bearings on my wife's Terra and the well-on-its-way-to-failing ones on my own it looked like the main issue was with the outer bearing of the sprocket carrier. And based on the amount of rust and grit I found in there it looked like the main culprit was lack of lubrication and ineffective seals. There is indeed a bushing across the 2 sprocket carrier bearings that accounts for the 20mm to 17mm difference btw.
Part #17 in drawings 42 (strada) and #28 in drawing 43 (terra) of the parts manual. Bearing numbers are correct as stated above.
Yes, indeedee doo. And there should also be a spacer between the bearings. That was the missing part I was looking for. That is why mine did not make sense. And looking at the parts list, I missed that spacer until just now. Could explain alot.
Certainly could ?? In the Cush hub, one bearing is located in the hub by the shoulder & the circlip, the other bearing can "float" in the hub (although a tight fit it can still "adjust" itself), the axle & spacers locate it axially, via the bearing inner races Chain/sprocket alignment is therefore via the Hub "secured" outer race & the inner race & spacers on the axle I much prefer steel/steel spacers on the axle
I was quoted 6 weeks + delivery so I made my own out of a washer using a grinder and a oil stone. Held it with an old speaker magnet. Dimensions (measured off OEM spacer which did turn up eventually): OD 28mm. ID 20.5mm. W : between 2.42mm and 2.45 (measurement varies as it appears to stamped out of a sheet - not machined).
It needs to be a close tolerance fit on the axle, otherwise it may damage the bearing seals I removed both inner seals & filled the space with high quality water resistant grease
Agree. I reduced a 30mm washer by spinning it on a drill against a bench grinder to the diameter smaller than the diameter of the seals. That was easy compared to gauging the thickness from the mangled and hammered spacer ( the collapsed bearings had hammered/ground the thickness to below 2mm) then reducing the thickness of the washer from 3mm. The spacer was simply not available from Husqvarna Australia, Bills or Huskyparts and I could not confidently match a BMW equivalent.
Pretty sure this is exactly the same part. Same wheel. Same cush drive hub. Same axle. Correct me if I'm wrong.
