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Has anyone here thought about how to reduce the side-to-side play in the rear sprocket on the 250/350 Ducatis? The single 6004 bearing allows quite a bit of play at the sprocket (you have to assemble the wheel without the rubber spider to see this) and the sprocket can be rocked backwards and forwards at the edge, even with a new bearing. Obviously it needed better support for the 450, which uses two bearings here.

Years ago I solved it on my Sebring by fitting another bearing into the housing next to the existing bearing, but I'm wondering if a C2 bearing might be better, which having less internal clearance should give less play.

Colin

You're getting down to the nitty-gritty, Colin.
But, is the standard design adequate? There don't seem to be many complaints.
I'm wondering if the extra bearing on 450s has to do with improving longevity because of the extra power, not necessarily due to misalignment.
Chains and sprockets are evidently tolerant of imperfect alignment. Some bikes have loose fitting, even wobbly front sprockets

Hi Jordan,

You are right of course, thousands of Ducatis were made and ridden with this sprocket arrangement and it was never an issue. The assembly is supported by the rubber spider anyway which helps.

I have been searching through my bearing catalogue and I cannot for the life of me remember what bearing I fitted to my Sebring, all I know was that it was fitted outside of the existing bearing and it replaced the rubber seal. Oh well, lost in the mists of time.


Colin

Hi Colin

i think it was a 16004 bearing . dimensions are 20 X 42 X 8

Eldert

Thanks Eldert!