Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > 998 / 996 / 916 / 748 > problem - bigger sprocket??

[andyb]

Originally posted by bradders
andyb - thanks for the reply mate but didnt understand a word!!

LOL

Imagine a 10p piece as a clock face ok, 12 at the top and 6 at the bottom etc, with me so far.. Now put a 5p piece on top. You could place it right in the centre or at the edge anywhere around the clock face, still with me?
Now, standing at the nearside of the bike, imagine the hub thats inside the swing arm where you undo the two bolts to alter the chain is the 10p piece, and if you look at the hole through the centre where you fit the spindle of your single sided stand to be the 5p piece, you want the hole to sit at around 5 o clock for the best fit, with your chain at the right tension.
This would also have the effect of moving your wheel away from your hugger!! increase your straight line stability etc etc.............

[bradders]

so...the hole is further back than the centre of the hub...

[andyb]

Yes, and it will appear a bit lower as the hub is eccentric, thats how it adjusts the chain, and why if you get it wrong working above the centre, ie from 9o clock to 3 o clock clockwise, it makes your wheel too close to your hugger. Here endeth the first lesson.

[bradders]

cool, I think I understand

can I put it together wrong? eg hub upside down or something? Or will it only fit one way..

[andyb]

Changing your sprocket carrier wont of been wrong...you either got it to fit or not. What you might be doing is working in the wrong area of the eccentric hub.

What you could of done is mark the outer serated shape of the hub, the bit where you fit your chain adjusting spanner, with a white mark tippex or paint, at the point where the "5p piece is nearest the edge of the 10p piece"
That way you would know instantly which way to turn the hub, given wnough play in the chain!

If you can afford it, buy a new chain (like a gold erv2) that is slightly longer. In fact they are generally supplied longer. Keep your original chain for when you sell the bike.

[bradders]

cheers, really points at the chain. its just too short....

[andyb]

Yes, aswell as you positioning the hub above the centre line as apposed to where it should be below.

[bradders]

so, just to confirm, the way to move the hub is using the tool which tightens/loosens the chain...and thats it?

[Mr_S]

Yep, that's it.

Want to borrow my chain breaker / rivetter?

I've only got 520 links though, and you'll need 525.

[bradders]

Cheers S, will get a 36t sprkt first and try that, make sure its not something I have done, also far cheaper than new chain!