In a world where both Shimano and SRAM are making wide-ranging cassettes from 42T to 10T or 11T, it was hard to see what the ‘extra sprocket’ manufacturers were going to do to answer them. OneUp components have identified a niche, they believe, and they’re going to fill it: introducing the 45T XTR sprocket system!
Essentially, if you run an XTR 40-11T sprocket, this little system will let you increase your gear range by 12.5%. OneUp state that your existing XTR (or presumably new 2015 XT) mech will work fine. You can increase your front chainring (should you want to) from 30T to 34T, with no loss of low range. And then, of course, you get an increase in your high gears – 34 at the front and 11 at the back = more fasterer, innit?
To ensure smooth shifting throughout, you also junk your 17 and 19T spider, and replace it with one 18T sprocket (which I suspect is made of steel; although the website only states it’s ‘not aluminium’ I don’t think it’s made of custard).
There is a weight penalty; the sprockets and cassette will weight 65g more, which doesn’t seem too bad, but that’s without the extra weight of the chain or larger chainring.
We’re getting a set in to test, so watch this space!
More information from OneUp Components