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Isn't the point of the Cush drive rubbers to be of softish rubber to absorb the "shocks" to the drive system?

Doesn't packing them out with extra padding or replacing them with a harder material defeat the purpose?

I know they don't last long (5,000 to 7,000 miles seems typical), but maybe that is something we have to live with.

Quote:

Originally Posted by uk_nick (Post 190801)

or replacing them with a harder material defeat the purpose

Shore A urethane is still quite compressable...
urethane has a higher resisstence to tearing & compressing/deforming than rubber..

Quote:

Originally Posted by Pleiades (Post 190784)

Are you confident the sprocket carrier bearing isn't knackered? The previous owner may have ridden a considerable distance on sloppy cush rubbers, which will have put extra strain on the bearing.

Pretty confident, since I'm the only owner.

Rubbers were knackered at 6,000 miles when I looked at them.

Up to 7,800 now...

How would I check the bearing?

Quote:

Originally Posted by WeaveMcQuilt (Post 190814)

Pretty confident, since I'm the only owner.

:eusa_doh:Sorry, was under the false impression you'd got yourself a used bike, not a new one!

Quote:

Originally Posted by WeaveMcQuilt (Post 190814)

How would I check the bearing?

Knackered cush drive rubbers give excessive rotational play, a knackered carrier bearing will give lateral play, side to side. Grab the sprocket with both hands at opposite sides and try and push/pull with alternate hands. Any rocking or movement means trouble. It is a better test to take the wheel out, hold the sprocket in a vice and insert the axle and look to see if the axle moves side to side.

Heres my two pence worth

Use to own an XTR for about 40k miles and replaced the cush drive rubbers twice over the entire time on the bike and that included alot of hard handed riding.

XTZ, first thing i did was pack the rubbers out as they where a bit loose when i got the bike, after another 3k miles (11k in total) they where shot along with the sprocket bearing. New bearing in and i find that the sprocket can still wobble on the bearing with a fare bit of free side movement, and that was with new cush driver rubbers. Any who i go for a 2600mile ride to Germany/Swizterland and for the last 200miles of motorway the bike was really slack feeling at the throttle, only once i got home, unpacked the bike and checked the chain on the center stand did i find.......you guessed it my cush drive rubbers are completely shot after 2600miles. Id said more than 1cm movement of the rear wheel and still the same amount of free sideways play in the sprocket.

Seems wierd but ive another set of cush drive rubbers ready to go in.