OneUp Your Shimano 11 Speed Drivetrain
OneUp your Shimano 11-speed drivetrain with the new 45T sprocket for XT/XTR (M8000/M9000) Cassettes. Get a perfect shifting, truly wide range, Shimano 1x11 setup, with the OneUp 45T expander sprocket and narrow wide chainring.
![OneUp Components 45T Sprocket and XTR Narrow Wide Chainring. Santa Cruz Nomad drivetrain.]()
The 45T upgrade increases the stock Shimano 11-speed 11-40 cassette range by 12.5%. This provides more total cassette range, it’s not just an easier granny gear. Adding the OneUp 45T sprocket lets you increase your 1x11 front chainring from a 30 to 34T without losing any low range. Eliminate dropped chains forever with our true Narrow Wide chainring design.
Cassette Zones
The OneUp 45T tunes the cassette progression into two distinct zones optimized for climbing and descending.
Climbing (21-45T) 13-15% cassette progression. Smaller jumps to maintain an optimum even climbing cadence.
Descending (11-18T) 15-20% cassette progression. Larger jumps to reduce double tap shifting and provide faster burst acceleration when mainly pumping not spinning down trails.
![One UP 45T sprocket]()
2x11 Conversion
2x11 Shimano XT/XTR equipped bikes are spec’d with 11-40 cassettes. This is because Shimano 11-speed mtb rear derailleurs do not have the capacity needed to run 2x11 with an extended 11-42, (or 11-45) cassette.
Install
As easy as the original OneUp 42T. Remove stock 17 and 19 sprockets and replace with our 18 and 45. Due to the large pulley wheel offset of the latest 11-speed Shimano rear derailleurs, B-Screw adjustment is well within the normal operating range and chain wrap is excellent throughout the cassette for flawless wide range shifting. The conversion keeps the 40T as the smallest aluminum sprocket for maximum cassette durability.
SPEC
Price: $90 USD
Material: 7075-T6 Aluminum (45T), Nickel plated hardened steel (18T)
Weight: 65g more than stock 11-40 cassette
Compatibility: XT/XTR M8000/M9000 11-40T cassettes. 11-speed only. Standard freehub body.
Cassette progression: 11-13-15-18-21-24-27-31-35-40-45
Increased Range: 12.5%
Colour: Matched to XTR
US Patent 9,011,282
![OneUp Components 45T Sprocket and XTR M9000 Cassette]()
MENTIONS: @OneUpComponents
The 45T upgrade increases the stock Shimano 11-speed 11-40 cassette range by 12.5%. This provides more total cassette range, it’s not just an easier granny gear. Adding the OneUp 45T sprocket lets you increase your 1x11 front chainring from a 30 to 34T without losing any low range. Eliminate dropped chains forever with our true Narrow Wide chainring design.
Cassette Zones
The OneUp 45T tunes the cassette progression into two distinct zones optimized for climbing and descending.
Climbing (21-45T) 13-15% cassette progression. Smaller jumps to maintain an optimum even climbing cadence.
Descending (11-18T) 15-20% cassette progression. Larger jumps to reduce double tap shifting and provide faster burst acceleration when mainly pumping not spinning down trails.
2x11 Conversion
2x11 Shimano XT/XTR equipped bikes are spec’d with 11-40 cassettes. This is because Shimano 11-speed mtb rear derailleurs do not have the capacity needed to run 2x11 with an extended 11-42, (or 11-45) cassette.
Install
As easy as the original OneUp 42T. Remove stock 17 and 19 sprockets and replace with our 18 and 45. Due to the large pulley wheel offset of the latest 11-speed Shimano rear derailleurs, B-Screw adjustment is well within the normal operating range and chain wrap is excellent throughout the cassette for flawless wide range shifting. The conversion keeps the 40T as the smallest aluminum sprocket for maximum cassette durability.
SPEC
Price: $90 USD
Material: 7075-T6 Aluminum (45T), Nickel plated hardened steel (18T)
Weight: 65g more than stock 11-40 cassette
Compatibility: XT/XTR M8000/M9000 11-40T cassettes. 11-speed only. Standard freehub body.
Cassette progression: 11-13-15-18-21-24-27-31-35-40-45
Increased Range: 12.5%
Colour: Matched to XTR
US Patent 9,011,282
MENTIONS: @OneUpComponents
Author Info:
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Maybe it's just me but the wide range cassettes are starting to get ridiculous. It's more weight in the wrong place (un-sprung mass). It's getting to the point where gearboxes are looking better and better; potential for more range with a comparable weight and better durability especially compared to the alloy rings.
"but you have to buy a new wheelset"
...to any comment that points out that SRAM's 10-42 cassette still offers more range.
Seriously...we get it. But you're talking about minimum $200 for a cassette and $500 for a new wheelset that's compatible ONLY WITH THAT CASSETTE. That $700 will buy the XTR Cassette, OneUp 45/18t combo, a 32-36t N/W, Shadow+ rear mech, and shifter, which you can then put on your EXISTING WHEELS that you probably are pretty happy with. When M8000 XT comes out and you can buy the ENTIRE 1x11 groupset WITH BRAKES and the necessary OneUp parts for less than $700, this is going to be HUGE. GX cannot compete simply because it starts at a $500 disadvantage.
It's great that SRAM has had this kind of range for awhile now, but it's just too damn expensive. I've tried every trick I could think of to make a cost-effective 1x11 setup (and I run XTR 2x10 now so i'm not talking "budget", just "reasonable") work and so far I just can't justify the cost. I'm going to be losing range and spending MORE. But this has my attention. When M8000 hits the market and I can run an M8000 cassette with the 45t expander, M9000 rear mech and shifter, and throw a N/W on my current cranks, i'm in. I can sell my existing cassette, mechs, and shifters to cover most of that cost. MOST IMPORTANTLY, I can keep my beloved wheelset!
But just for the sake of argument...you're still adding an extra $80 to the $200 10-42t cassette, which STILL means that the $180 XTR cassette plus $90 OneUp expansion is a little cheaper. Now consider how cost effective this will be when the XT cassette is out and you can buy it PLUS the OneUp expansion for $150. That's right around what the GX cassette will cost alone, completely forgetting the XD driver.
Basically, i'm just pointing out that this is going to be a pretty big deal.
So realistically, resale value is a non-issue. This doesn't even take into consideration the amount of brand-loyalty there is in bike parts. My bikes would be completely passed up by SRAM guys in the market, just as if i'm looking at used bikes, one built with a complete Shimano drivetrain would be worth considerably more to me than one with a full or partial SRAM drivetrain. It's not that I wouldn't give it a try if the price is right, it's just that I would be concerned that I wouldn't be happy with it and would have to spend more to replace that drivetrain.
Paying more up front and doing it right = easier to sell, sells for a higher price, AND you get to enjoy the good stuff leading up to selling it
I will, however, happily pick up a Pike when the hype dies down and the mob finds something else to swoon over, and try 1x when it is the same or cheaper than 2x and offers the range I need.
I can buy a full M980 XTR 2x setup (leaving the brakes out of the argument) brand new (not takeoff) with all the bells and whistles for about $750 from Merlin. Best I have been able to find, for a full XX1 setup, even using the cheaper X01 Cassette, is $1001. So i'm paying an extra $250 and getting fewer parts for my money, all while sacrificing range and reliability...and that's assuming I have a wheelset with a convertible hub.
If you know of a place to buy XX1 cheaper, i'm all ears.
No system is perfect... 2x10 XTR is going to weigh more and you have to deal with a front derailleur. And XX1 can be had brand new $850 online.
If your choice is 26" it is dying quickly so new standards will result disappearing choices. In this case, far too quickly. Eventually, you will not have a choice except to buy a new bike.
See: Easton's new wide rims are not made in 26", Vittoria no longer makes "trail" tires in 26," just DH casing tires, Spank Subrosa rims no longer available in 26", etc.
I've been building bikes for the better part of two decades and I find tuning FD's to be one of the easiest tasks in bike building. Nonetheless, I see validity in the argument for less complexity, and less weight. So i'm all for 1x when it's practical. The problem is that too many folks are going 1x because it's cool right now, and sacrificing their riding experience because if it. For the trails I ride, 1x (at least up until this 45t cog became a possibility) is just not sufficient. I would either have to go with a 32t up front and have my friends disappear into the distance on descents, or go 36t to keep up on descents only to have to dismount on every climb. If I really wanted to walk a trail i'd just buy a nice pair of sneakers and save about $5000.
When M8000 is available and I can see the pricing, the XT cassette and the OneUp 45t cog MIGHT convince me to give 1x a try.
The standards argument is completely valid here because this 1X drivetrain fervor is quickly creating these massive and heavy cassettes that are useless for people that want to run 2X or want a light cassette that is reasonably priced. The availability of a sub-280g cassette below $100 is disappearing because of 1X so the popular argument of "stop bitching because you don't have to buy it" is not true because I will very soon have no choice except to buy it. I do not want a 40-11t cassette that weighs 400+g for my 2X. I do not need that much of a spread. I want a 34-11 cassette that weight 270g or so for under $100 to pair with my 24/36 up front.
The mention of 26" is merely an example of an "old" standard already losing serviceability, just like it is difficult to find a reasonably priced, properly geared, and reasonably light cassette for a 2X system. The mention was not to open a wheelsize debate but to illustrate customers already being hung out to dry.
The industry is shooting itself in the foot. Just like people stopped buying Saabs when their future was bleak. It is common sense to avoid buying something that might be difficult to service or find parts for in the near future. Maybe our sport is immune and there is more disposable income than I realize.
Gearing configurations are now like pedal preferences: different people have different needs and desires, one is not inherently better than the other. It used to be that every new bike came with all the possible gears, so everyone was taken care of. Now, the people who want or need fewer gears have off-the-shelf options. Great! It just makes me sad that they've been dupped into paying more for it.
I've been trying to work out a cost-effective way to do 1x11 on my second bike, because I love to try new things, but I just can't make it work within reason. No matter if I do SRAM 10-42 or OneUp/Shimano 11-45, there's no way to do it at this point that won't cost me significantly more than even a 2x all XTR setup. On top of that, i'll be sacrificing even more of what I already consider to be a tight range for the trails I ride. With my current 2x (26/38F, 11-36R) my low gear is JUST ENOUGH while I could use another gear or even two up top. But it's enough that I can deal with that. There's no 1x11 setup that will even cover the range I currently have. I'd have to sacrifice another two gears top or bottom...it just doesn't make sense, ESPECIALLY since i'd have to spend another $300-400 for it!!
www.bikeradar.com/mtb/news/article/shimano-deore-xt-m8000-11-speed-first-look-44084
11-36 cassette. I still make it up some pretty gnarly climbs; no need to drop big money for lower gears, just get out and ride, get fitter.
...oh wait they do, it's called a motorcycle!! Why are we all using muscle-power like a bunch of suckers???
vaaaaarooooooommmmm!!!