Flywheel differences

Hi all, I bought a E Clutchmaster clutch & lightweight flywheel kit from the States. I've since also acquired a lightweight flywheel of good provenance but unknown brand & I'm surprised how different they look!? The bolt pattern & ring gear are a match but otherwise they are a different design. The new one on the left weighs a sturdy 6.2 kg & the used one is 5.0 kg. " />

First one looks wierd cant say ive seen that design before ....

I've never seen one like that before on an R either.

Looks like this 1
http://m.ebay.co.uk/itm/331420809405?nav=SEARCH

" />

Yes, very similar!

Maybe yours is an older model or maybe just a slightly different weight hence the different drill pattern?

Or the one on ebay maybe the older model, there is only one left in stock

Probably just a similar design as the Aussie one is Par & mine came from America. Good to know if Par make one like that it must be a pukka design. Both chromolly.Maybe better driveability being a bit heavier?

Can anyone remember the weight of the standard flywheel?

9kg roughly
did do a post on it but search is useless thus can't find it :-/

Cheers Mr B. I think I'll have the new one fitted as it's still a fair weight saving over standard.