Solo44

The Praxis cassette in operation: I've been using one of these cassettes for a couple of weeks now, on my road bike. The rear derailleur is a Deore XT 9 speed which works fine with my MicroShift 10 speed levers. Shifting on and off the two largest cogs was a bit of a problem using a new SRAM chain, but things improved a bit when I switched to a new KMC chain. The KMC measures ,006" narrower at the pins than the SRAM chain. Still, when shifting down from the 40 tooth cog you're likely to miss the 34 tooth and end up on the 28. Seems that the difference in teeth is just a bit much to handle and maybe a 36 tooth cog would have worked much better. Endless fiddling with the derailleur didn't improve the situation. The Deore derailleur just clears the 40 tooth cog with a bit of room to spare when the B screw is turned in all the way.