Charles Ramsey

Shimano is now making antiflex spacers. https://share.ovi.com/media/currentre...resident.10300 The design is rather obvious others have done it and I have been making them out of plexiglass for years. Shimano did not bother to reduce the weight of the cogs though they could have done so. Let's see if Shimano knows what it's doing. The spacers are made out of brittle plastic these break at the holes where bolts hold the cassette together. The brittle plastic was justified in the older spacers to give them some compressive stiffness. With the new design they could have used a non brittle plastic this would have reduced the price of the spacers a shop will charge you 1$ each for these and reduced the number of defective units leaving the factory. Shimano could also have aligned the splines with the holes increasing their strenght.

Kimmo

Pretty lame... I don't see another ring of bolts to hold it together away from the centre.

And if that's the way you're going to make a cassette, then you can really skimp on the steel.