cushdrive/sprocket carrier

twinweb

twinweb

Hero member
Location
oz
fitted new bearings to wheels and cush drive. the outer one(on cush drive) was not as tight as it should be,so i lock tighted and fitted it-anyway its spun and im gonna machine and sleeve it. im not sure if ive got the bush that goes through cush drive round the right way(i didnt pull wheel apart-my painter did)does the bush protrude through the cush drive about 3/16th on sprocket side ?then the 19mm long spacer goes between it and swingarm?this is how ive done it and it doesnt seem right(spacer doesnt bear on outer bearing inner race)any advise(or photo) appreciated

cheers paul
 
Hi Paul,

The shouldered spacer that goes through the innermost cush bearing must have its shoulder on the inside (towards middle of bike) - with its shoulder butting up against the RH wheel bearing inner race.

In addition, there should be a spacer between the 2 cush bearings.

Hard to explain, but just look at logically - when the axle nut is done up, the force should compress a solid pillar of spacers/tubes to form a central stack, around which the bearings are free to spin without having lateral force applied to them.

HTH, Paul
 
thanks mate-thats how ive got it-but the cush drive spacer protrudes 3/16 inch on sprocket side-doesnt seem right-wish i hadve pulled it apart myself!
 
Hi Paul,

The top-hat spacer outer face should not be proud of the outermost bearing inner race. Only thing I can think of is that the spacer between the cush bearings is missing and thus the cush bearings are closer together than they should be.

P

An 'of no real use' photo...
laverda%20jota%20rear%20wheel%20and%20spacers%2001-01-1999%2003-23-42.JPG

 
thanks mate-will check out when get home from work-i really had trouble sliding chain adjuster in-now i know why!

paul
 
3/16th what is that in millimeters ?..... Please ?

  I am a metric baby .... And for someone to expect me to calculate that figure from BSP TO METRIC is having a trip !!.

    Should we just work on British Cycle Thead ?    38/1..
 
The sins of the fathers Eh?
I have worked in heavy engineering for 32 years now and it is and probably forever will be a mishmash of metric, american/english imperial.
Most industry is the same, even if a virgin plant is built from scratch equipment is usually sourced from all over the world. Each manufacturer has it's favoured way of doing things.
Best to just accept that the world is not perfect.
Worst of all are the 'evil bastards' in the automobile industry that doctor standard bearing sizes so you have to buy from them.

Getting back to the topic!
I stripped my rear wheel after buying the bike in bits and was totally confused by the setup of the sprocket carrier. There was no provision for transmitting the spindle tension through a spacer in the centre.
I concluded that the previous owner had tossed the top-hat spacer, thinking that it was superfluous to needs, and fitted different size bearings to compensate! Scary thought eh?
The bearings must have carried the tension of the spindle nut in addition to the normal dynamic load when riding - not a healthy state of affairs.

SimonR
 
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