First Look: OneUp Components DH Block

Feb 15, 2015
by Mike Kazimer  
OneUp DH Block

OneUp Components have announced another addition to their growing line of drivetrain accessories, this one aimed at downhillers looking to convert their cassette into a 7-speed setup. The DH Block is a lightweight aluminum spacer that replaces the three largest cogs on a SRAM or Shimano 10-speed mountain (11-36) cassette to make a 7-speed, DH specific set-up, and it's also compatible with 9-speed and Shimano's new XTR 11-speed cassette. Once the cassette is reduced to 7 speeds (or 6 with a 9 speed cassette), the whole span of gears can be quickly covered with just a couple clicks of the shifter, typically with a two tooth jump between each sprocket.

OneUp DH Block
A thin spacer or two are needed for running the DH Block with 9 or 11 speed cassettes, but to convert a 10 speed cassette only the Block itself is necessary.
OneUp DH Block
The DH Block is tall enough to help keep the chain from dropping into the spokes.

Installation is about as easy as it gets – just remove the cassette, install the DH Block and any necessary spacers, then reinstall the cassette without the upper three cogs. On certain derailleurs it is necessary to set them up by clicking through the first two or three gears and then adjusting the cable tension, due to the fact that the limit screws don't have enough reach, but OneUp has a reference chart that details all of the compatibility options.

The resulting gear range is the same spread as what's found on the road cassettes that many DH riders currently use, but without the one tooth jumps between each sprocket that can lead to excess shifting while trying to find the right gear. It's certainly a niche item, but it may be the ticket for riders looking for a less expensive alternative to SRAM's X01 DH cassette, or simply interested in trying a 7 or 6 speed drivetrain. In addition, the height of the spacer helps keep the chain from dropping off the backside of the cassette and into the spokes, potentially preventing costly wheel and derailleur repairs. Weight: 40 grams. Available in green or black, the DH Block retails for $45 USD.

One Up DH block chart
OneUP DH Block chart


  • 117 4
 One up is definitely one of my favorite companies right now for making top of the line drive trains available for a fraction of the cost.
  • 33 12
 buy 3-4 bb spacer, costs way less than half this and any other conversions out there. be done with it
  • 9 17
flag wuzupjosh (Feb 15, 2015 at 22:34) (Below Threshold)
 it works fine , you get your tension screw maxed out , you may need a longer one but thats its , i also wish shimano had better tension screw , cant count how many ders i threw out this year cuz of bent ones...
  • 12 3
 It would look like shit and it would be nice to know your chain won't fall off (it probably won't either way but still). This thing looks good and does the job
  • 6 32
flag wuzupjosh (Feb 15, 2015 at 22:42) (Below Threshold)
 and makes your bike heavier ....factor .
  • 10 3
 Not going to feel it at all...
  • 10 28
flag wuzupjosh (Feb 15, 2015 at 23:08) (Below Threshold)
 but the scale will :p
  • 61 9
 I've said it before and I'll say it again... what is the point of seven speeds if the hub's flange spacing is the same as ten speed? A better idea would be change Dh bikes to 12x142 and 73mm and run 6/7 speed. Stronger dishless wheels, better cornering clearance and cross compatibility with all your bikes. If you're only running 6/7 speed, 150 is unnecessary, therefore 83mm is also unnecessary. I like one up, but I don't see the point of this. If you're using a ten speed freehub, you might as well use ten gears. YOu never know when the wider range will come in handy.
  • 14 4
 @jaame ide rather be able to change through my gears quickly than be able to find the perfect ratio every time
  • 33 2
 I mean instead of using seven speed with an 11-28 spread, use ten speed with an 11-34 or 11-36 and still get that 11-28 spread in your highest seven gears with the added advantage of three lower gears. Removing three gears and filling the dead space with spacer is beyond pointless. If you're going to create a load of extra space on the drive side, fill it with a hub flange and spokes. You'll see. In five years it will happen.
  • 4 6
 good point , too bad they dont make em
  • 8 0
 Some of the single speed hubs actually allow 6 gears (like Hope). I would much rather buy that hub and build a custom 6sp drivetrain than sell my kidney to be able to buy one of those 7-speed Sram DH systems.
  • 3 1
 @jaame, thank you. I was thinking the same thing. This is maybe a decent idea if it cost less than 10 bucks. It seems silly to pay any more than that just to eliminate some gears.
  • 5 1
 I agree that it seems kind of pointless for most applications. I use a similar product on my DH bike because it's a single pivot with a lot of chain growth. Being able to use the larger cogs, even only up to a 28t means I have to keep my chain pretty long. In my case, site I don't need the 3 big cogs, running this allows me to trim a good deal of links off the chain which makes the lower gears that I do use run better and I have that much less chain bouncing around.
  • 2 0
 Yeah I can see that.
  • 3 3
 @Mattin, I roll that set-up on my Yelli Screamy. Just enough gears, but with a 0-dish wheel. Unless you are a pussy- that is plenty.
  • 7 1 have had one available for less for a while now! Still the better option
  • 4 0
 I got one you can have for a tenner Smile
  • 1 2
 This head problems tho, i know four-day hand that buy not having the capability to go into the top 3 gears, you're derailleur can't be adjusted right, and shifting isn't as effective. Plus, y put a spacer there, may as well have the extra cos and range if you're not gonna drop weight
  • 4 5
 the point here is not dish or wheel strength doh! its gear range selection, speed, and not mulitple shifting to find the right gear, something if u rode fast enough and on a track or trail that is worthy of yr DH bike, maybe the light bulb would go on! We have been saying this to manafactures for 20yrs and they still add more gears for muppets! Nice work On-Up, lest some one is listening and can read, so some of us appreciate that and the effort.
  • 2 1
 i agree with using a single speed hub and using 6 , but there isnt many good poe hubs that have it
  • 2 1
 @mav maybe if you learnt to read the light might go on
  • 2 1
 All of these supposed "benefits" like "gear range", "smaller gaps between gears", or "not mulitple shifting to find the right gear" are missing one important point - fit this, and the gears you have are the same gears as you had before. Just three fewer. Gapos between gears are unchanged.

There's pretty much nothing here, other than a minor weight saving, that can't be achieved by just tightening your limit screw
  • 1 0
 make your own out of loose sprockets and you can have something else Wink
  • 1 0
 @ jaame,

You called it! I was wondering what the "new" thing was going to be after the, wheels, headsets, BB etc....Although your recommendation is so practical and so on point....I do remember folks using modified cassettes on CK single speed hubs with this very thing in mind.

I'd patent this and then market it directly to SRAM!

But honestly:

A dt swiss ss 135mm with a 142mm axle conversion and a halfway decent machinist ( should get you there.

  • 2 0
 don't see the point in modding a cassette when you can use cheap single rings and have any ratios you want. still pretty neat though.
  • 1 0

Maybe the shifting or keeping the body from getting marred DT's have Al? I have not tried it yet....but there is something inherently fun about machining it down.

  • 1 0
 yes shifting may suffer a bit but not enough to bother me with the ones I have tried, the bigger rings are more of a problem with chewing up alloy freehubs true. many cassettes have the smaller ones mounted individually.
  • 29 1
 Finally a company that constantly makes me, my bike, and my wallet happy.
  • 15 9
 By selling you a new part that you don't need? Big Grin
  • 4 4
 @Mattin I don't get it.
  • 17 8
 If you set your limit screw correctly your chain can't fall off anyways. So the plate is useless and just being extra weight.

As for the spacers, you can just take them out of an old worn-out cassette you still have laying around. Or if you don't have an old worn-out cassette I'm sure one of your riding buddies has one. If not, go to a hardware store and buy rings with an inner diameter of 1.25" for a couple of cents per piece.

You can save 45 USD + shipping by not buying this product and have the exact same results AND save weight.
  • 2 1
 @Mattin , I have exactly the same set up as you, it works great.
  • 2 2
 the shop usuualy has extra too
  • 3 1
 Hope could make so much money if they rename their SS hub to a "6 speed specific DH hub"

Especially if they'd also produce a matching cassette for those who don't like modding parts theirselves.
  • 2 1
 or come out with theyre proto 9t already ive been hearing about a few yrs
  • 1 1
 Some smaller rider owned company has already been making geared cassettes with a 9t cog. Just cant remember their name. Only fits their own hubs though, since 9t wont fit on a standard body.
  • 3 4
 canfeild had one , crap engagment tho , i want stealth hubs, onyx , or profile to make one , that would be guccia
  • 21 3
 You can do without this altogether.

Just split your cassette and use the cogs you need. Use some spacers ( a good single speed kit has a good range of sizes ) and properly adjust your derailuer limit screws and the chain wont come off into the spokes.
  • 3 6
 till the derailleur breaks and gets sucked up behind the spokes, then it breaks the hanger too, and all your spokes are dead.
  • 11 0
 @markunit10: This set up won't prevent that from happening
  • 4 0
 Ha ha ha. Sounds like a bad day.
  • 2 0
 I think a broken derailleur getting in the spokes is no more likely with this set up. If anything the spokes are less likely to get damaged if the chain happens to go off on that side. So far after two years with this set up, the chain has never gone off.
  • 17 1
 Finally, a high end pie plate!
  • 15 2
 Looks like a copy of the Fouriers Spaco
  • 19 0
 Here's a shot of product testing from Whistler Bike Park last season. You may recognize the rider...
  • 10 0
  • 2 1
 How was that photo taken? It's badass!
  • 2 20
flag biker3335 (Feb 15, 2015 at 22:41) (Below Threshold)
 Is that b-sem?
  • 18 2
 You think Brandon rides for Commencal? Peasant.
  • 10 7
 Haha everyone takes shit way to seriously
  • 3 3
 Well and I've just bought the Fourier's two days ago in red, wanted a black one. Wouldn't be upset about it, if the shipping from Fourier's didn't cost half the price of the spacer :-( So good job on making an alternative that can be shipped for a reasonable price :-)
  • 7 0
 that pic ! Look at tire clearance =)
  • 3 0
 Ding Ding Ding

@six66 - unicorn cam
  • 1 0
 I see a GP Gnarwal mount
  • 1 2
 @MrDuck as them to send as a gift. i do that everywhere
  • 10 0
 Dear Hope, see what you've gone and done with your crazy green policy!?.
  • 6 0
 The more I think about it, I think its actually better if more companies started making 7 speed specific rear hubs. That way there is no need for a spacer and it actually increases rear stiffness since the spokes are supporting the axle more from wider width. Atomlab I think was the first to start this idea
  • 11 2
 OneUp is such an awesome company. I love my 42T + 16T ring conversion.
  • 7 1
 Quick, Everyone buy 10-speed its the new big thing. Quick buy 11-speed its the newer big thing. Quick buy a 7-Speed we went too far.
Customers be like "make up your damn mind
  • 5 0
 Little kids in the woods can go back to asking 'oi mate, how many gears you got?'.
  • 7 0
 GEARBOX!!!!!! !
  • 2 0
 Been riding SRAMs x01 dh 7 spd on my v10 and needless to say it is not the end all dh drivetrain. My next dh bike will have a gearbox, it just makes sense
  • 1 0
 check my pics out !!! my enduro bike works like crazy with that gearbox!!
and in DH, the gearbox did 4th last year in JR worlcup championship with NICOLAI (german brand who have bought the effigear gearbox concept)
  • 1 0
 Sick looking bike, and it's nice to hear it's working well for you and others, hearing stuff like this only strengthens my feelings
  • 5 1
 I don't get it. I ran a 7 speed on my p3 for dual slalom and had the stop set right and it wouldn't fall off the last cog. My sx trail is a 7 speed and its set up the same way, why have one of these?
  • 1 0
 Same reason I run a chainguide even though I've never dropped a chain off a narrow wide ring. The minute difference in weight isn't worth the possibility of a dropped chain ruining your race run.
  • 5 0
 I feel this could be made with a 3-D printer. The plastics are strong enough and would be far cheaper.... Looks like I have a new project!
  • 6 1
 Could have better weight, too!
  • 11 5
 Wow... Or u could just not shift into the granny rings.... Lol
  • 7 2
 Thats what I was thinking. Just set the limiter screw to use only the lowest 6 or 7 gears, a longer screw would do the trick

What possible benefit does this product provide? Surely having 3 more gears isnt a disadvantage, but could be used in a rare climbing situation instead of being swapped for a big shiny $45 spacer.

Unless i'm missing the point
  • 2 2
 *edit: the stock limiter screw would work just fine actually
  • 3 3
 @riggadon exactly why I posted my comment - I ran 8 speed for ages on a 9spd cassette, just limited the biggest ring out so that it acted as a chain catcher, at least then u still have a low gear for the odd hill climb occasion, just seems like you'd be paying money to downgrade your bike lol
  • 1 1
 on my 10 speed rear cassette i am ruing 7 speeds, my sram cassette was all individual cogs, put it just to be a 2 teethes climb every time you shift, and filled the empty space of the 3 cogs that got out with old cassette spacers, and just limit your rear derailleur so it work's properly(i run a shimano zee)
i opted for this so that i wouldn't need to double shift, as road/dh cassettes are to close spaced on the teeth numbers, on rad is fine, but on a mountain bike not really, and as i didn't bought nothing was free
  • 7 1
 Black or green only; to compliment your DVO Emerald. fork.
  • 5 1
 and thats about it ... why not goddamn red or blue too eh? fouriers also come out with one of these a few month ago
  • 2 0
 This is lame. What would actually be a good idea is a modified 11t cog and lock-ring assembly that allows you to slide your 6-cog conversion along the cassette body toward the centre of the hub. This way, even when you've shifted into your smaller cogs your derailleur remains tucked under the swingarm, out of harm's way. I did the same conversion on my rig - but it was a pain and required serious modification with a dremel.
  • 2 0
 Meh. This is far and away not the best way of achieving this.

9-speed 11-28 road cassette. Zee (or any other Shimano) 10 speed clutch derailleur, 9 speed Sram shifter and a $20 adapter. Perfect, crisp shifting, cheap components, no redundant gear ratios...
  • 5 0
 'I only ride park' was yelled into my mind when I saw this.
  • 6 1
 Ti springs has the same spacer out for a while now, nice copy
  • 1 0
 The use of road cassettes for dh seems to me like the stupidest thing ever, absolutely incompreensible, and it boggles my mind how even bike manufacturers include them on their bikes. If you want to use a shorter chain, just do it, no need of using a road cassette and having to shift two or three gears at a time. Just limit the derailleur and use only the smallest cogs. No need for this device either, the bigger cogs do the same job as this, preventing the chain from moving into the spokes. Me, I actually prefer to keep the chain long, it's not really a problem, and the extra range can be useful at times. Besides, when going down I won't likely shift into the bigger cogs, so the chain won't be near the spokes anyway. And as for 7-speed drivetrains, they are only an advantage if the hub moves the spokes into the place where the bigger cogs used to be, centering the rim and equalizing spoke tension on both sides. If this is not the case, the only thing 7-speed does is create an extra gap into which the chain might fall.
  • 1 0
 There is another advantage in keeping the extra range of 9 or 10 speeds for dh, which is that one may use bigger rings up front. I grant that I am not a "spinner", but it seems awfully strange to see dh bikes with 38 teeth rings when I can even max out a 44 teeth on a (moderate) climb. The use of these small rings up front started rising as the trend of using road cassettes for dh started spreading, as the biggest cog of a road cassette was often too heavy to use with a decently sized ring up front. So the end result was that the psychological illusion that using a road cassette would give you more speed because of its heavier range, ended up reducing the whole drivetrain to a lower multiplication ratio, and to a lower possible speed. So that now a downhiller has to have a furious-rabbit spinning pace to catch up with a cross country bike on a downhill.
  • 1 0
 "The resulting gear range is the same spread as what's found on the road cassettes that many DH riders currently use, but without the one tooth jumps between each sprocket that can lead to excess shifting while trying to find the right gear."
I don't get it, how is dropping the biggest three cogs changing the one tooth jumps? The smaller cogs stay the same, right?
  • 1 0
 The gear spread on road cassettes is tighter, typically increasing by only one tooth compared to the two tooth jumps on an 11-32 or 11-34.
  • 1 0
 Ok but I'm running an 11-36 now, using the DH-block won't change the spread to two jumps right?
  • 1 0
  • 1 0
  • 4 2
 One Up continuing to prove that you don't need to spend $1000+ on a fancy drivetrain. I hope Sram and Shimano can figure this out one day..
  • 4 1
 Looks nice if you want some bling for your bike but its hardly a performance upgrade
  • 3 0
 Yeah man, this is not for trail bikes. This is for DH. Completely different thing. Get your shit together bud.
  • 4 0
 Finally I can buy a aluminum dork disc
  • 3 0
 regurgitated idea from ti at a higher cost. OOOOH but its green!
  • 5 2
 Hey look everyone. someone made a aluminum pie plate.
  • 3 2
 Since when is a limit screw not enough anymore? Never had any troubles like what this should be preventing, because the limit screw already preventes this for me.
  • 4 0
 Either way, this sentence will save everyone:
"but OneUp has a reference chart that details all of the compatibility options"

A company, which has the customer in mind...
  • 3 0
 Lose three gears to have a green thingy in my back wheel!? Damn right.
  • 4 2
 Or an inch of 40mm plastic waste pipe.......

Weight 7 grams;
Cost: found in skip.
  • 1 0
 A gearbox with a concentric pivot (Jezken) or a symmetrical parallelogram (Tollwut) cures all the problems that junk like this is supposed to treat.
  • 3 1
 This is such an exciting bike part!
  • 1 0
 now we dont need to pay 300$ for the 7sp sram anymore Big Grin 100$ and you should be good lol
  • 1 2
 so here i was last year being the only kid with a 7spd setup , now there is going to every kid that follows pinkbike with one of these and 7spd , just letting everyone know i did it before brendan fairclough evan did it!
  • 2 1
 Can you get OneUp Components in Australia? I can't find anything
  • 2 1
 Where have you been looking? Not the website then?!?
  • 2 0
 Yeah I just realised that. Cheers.
  • 3 1
 Thumbs up for OneUp!!
  • 2 0
 Cool! A CNC'd dork disk!
  • 2 0
  • 1 1
 but this doesnt solve the double or triple shift required on a close spread cassette. so whats the point?
  • 2 2
 How do you convert 10 speed shifter to 7?
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