Team Fab

OneUp Components launches 45-tooth range expander sprocket for Shimano XTR - BikeRadar


Not sure how many people this will help but may allow some of the tandems running two front rings to run larger rings and still climb hills.

twocicle

These super-wide cassettes are getting a bit ridiculous, at least for anything roadies would sanely consider. They are suggesting using 11-13-15-18-21-24-27-31-35-40-45 (whereas stock is 11-13-15-17-19-21-24-27-31-35-40).
While that might make a kudge workaround for 1X chainrings, it does not seem at all useful otherwise. For more serious climbing gears, I would reduce my granny to a 28t (we currently run a 48/30 x 11-32 for extended or steep climbing) before even considering the standard 11-40 mtn cassette on a road bike. By comparison, the gear spacing on a 11-28 11spd cassette is our preference for standard riding.

jnbrown

here is another option:

The Praxis Wide Range Cassette ? The scoop! | Praxis Cycles

Chris_W

We're running the XTR 11-40 cassette on our tandem, with 30-46 chainrings. To make the spacing better, I got a 105 12-25 cassette and used the first two cogs from that to make it a 12-40. The steps on that have proved to be just fine for us, and it's great that it fits on our 10-speed freehub body. Shifting is with a SRAM Rival 11-speed shifter and X9 "10-speed" rear derailleur, which works just fine. I can't imagine needing the 45 tooth cassette cog unless we wanted to use a compact (34-50) crank. BTW, we live in Switzerland, so most rides involve significant climbs.