Yess Labs - ETR-B Preview

Jan 24, 2008
by Jordan Holmes  
Yess Labs, a Canadian based company with strong BMX ties, has created a revolutionary way of working with chain tensioners. Utilizing the opposite fashion of most chain tensioners, the ETR-B is pushing against the chain still, but it is mounted at the bottom bracket, compared to the rear dropouts.

Check it out.Yess Labs hooked us up with their revolutionary new chain tensioner. How can a tensioner be revolutionary you ask?

Well, check it out.

This is the old System:
Old System

Old System


What this system did was apply pressure to the top side of the chain, as you can see, and it was positioned at the rear drop out. This means, when the bike goes through it's suspension, the chain grows, but the tensioner keeps pressure on it, making it so the chain can't jump off the gears. The only risky part of this system, is you still have a chunk of metal hanging off your drop out, making it really easy to hit it on something.

The new System:
Top View

Top View


While the older system is primarily designed to aid in allowing short travel full suspension bikes to run a single speed, this new tensioner is geared to the hardtail rider and their frames. Since chain rings are often not perfectly round, this set up is really beneficial to those trying to get the ideal wheelbase length and not have to worry about overly tight or loose chains.

This system allows you to install it between the bottom bracket and the frame. In doing this, it allows you to keep the rear drop outs clear, and clean, which lets you creep a bit closer to those roots, are hug that rock just a little closer. Another big benefit to chain tensioners is that they allow you to run a single speed dual suspension bike. Without this design we would all be relying on horizontal drop outs, or running a derailleur in the place of the tensioner. Expect to see these on slope style bikes and dirt jumping bikes world wide this season.

Stay tuned in to see what bike it ends up on!

For more information visit Yess's Website or contact them through your local bike shop.


28 Comments

  • + 8
 this has been done befor.....dmr anyone?
  • + 4
 No offense to the DMR version that seemed to be made of tin but this tensioner is machined out of aluminum and for the guy below asking about a sub 30 tooth set up=yes the adjustments that are built into this tensioner will allow for a wide range of front chainring sizes to work.
  • + 3
 I ran the old DMR "tin" BB mounted tensioner for a while, and aside from it being weaker than a pop can, it got in the way of pedal grinds and sprocket stalls etc. on that side (it sticks out below the bashguard, unprotected), and I asume the Yess would too. Yess does however also make similar tensioners for the dropout, for both vertical and horizontal styles. I'd much sooner run one of those.
  • + 0
 Yeah, DMR's got the cheapo tin Chain Reactor, but Elite Chain Reactor and the ISCG ones are also CNC stuff that's been out there for years!
  • + 3
 you mean with VERTICAL dropouts ^^

the only TRUE way of solving all tensioning issues with ver DO's is to buy the White Industries ENO Eccentric Rear hub.

Its the only one of its kind and is a sure fire way to get your ss dialed.

I have tried all the main tensioners.
dmr, rennen, home made, surly....

they dont work good. they suck

I purchased the ENO hub and my problem has been solved.

look in to it. It isnt cheap but it solves ALL ss problems and issues.

I HATE tensioning Issues.
  • + 3
 Sounds like someone can't set up a tensioner...
  • + 0
 orrrrr you can get a ghost cog from an old cassette and save money $170
  • + 0
 you all must be blind. It is based on a spring tension system.. the bottom link actually pivots.. and is the only way to make a dually a SS...... the DMR tensioner is a piece of tin that has no tension abilities, It is a meer chain guide at best and should be the first thing you chuck in the trash where it belongs... it wont take up the slack from the difference in chain length during a pedal stroke.. chainrings.. and mounting holes on cranks are never perfectly centered, especially on 3pc cranks... so your chain is either too tight, or too loose with the DMR system, and this YESS one has true tension abilities, and will take up and give slack when needed during a crank revolution.. Good Job to YESS on the engineering that most don't understand....
  • + 0
 achurly you can use a surly tension seeker on a fully too as they are also spring tensioned.
  • + 0
 and to the guy who says the white industries is the only way to solve this issue... it still does not have the ability to take and give slack when needed.. it would work great if your chainring, cranks and cassette and sprocket are perfectly true... even 30 thou of an inch ( the width of a few peices of paper.. and I'd put money that they have more runout than that...) combined, the ring, crank and sprocket will end up in a quarter inch slack that this system will give and take ... and the adjustment would probably allow to take and give a good inch and a half or chain deflection on a dually setup.... this YESS product is really a great device....
  • + 0
 " aluminum is white metal" I suppose, but 6061 aluminum with the gusseting that is in this guide is a helllll of alot tougher than the sheet metal of the DMR, and this is spring tensioned.... so if you happen to hit it on a rock, worst case is it breaks.. most likley it will deflect.. being it is sprung... and bounce right back... As far as how much travel it can handle.. depends on the type of frame linkage.. some don't move much, but the VPP / Maestro designs will probably have more chain travel, as it is a larger pivot area... doubling up seems silly enough, but it would probably work.. and the rear hanger only sticks out as much as a regular derailleur, making your dh rig even cheaper to build and fix.. then again you could run a Rohloff rear hub ( www.rohloff.de/en/products/speedhub )and a single chain.. usually reserved for bikes that have the main pivot built around the BB.. like some of Cove's designs, as the chain length does not change throughout the travel range.. or bikes like the Nicolai where it has a double jack shaft system... I think the best way to go is to track down one of those Honda internal geared bikes ( that unfortunately is no longer being made / tested..) pimp it out and ride it.... good luck finding one!! ( just an engineer that rides... with too much time to waste right now... till the weather clears up)
  • + 0
 If your looking to gain some business and interest in your new and innovative product, I think it's kindof funny that you almost knock the design of a product which makes up 50% of your online store. I'd also be interested to see a picture of it installed simply to show how it looks/works.
  • + 0
 This tensioner is aimed at hard tails and bikes with horizontal drop outs that are/want to run single speed. The rear drop out mounted tensioners are primarily here for that task to, but they work amazingly well with shorter travel fullies to enable them to run single speed. Different applications.
  • + 0
 I really like the design of this tensioner, but have been frustrated by the lack of info available for it. If anyone has found any reviews or photos of it mounted and/or in-use, please post links. After inquiring with YESS, I received a very courteous and responsive reply to my questions. The reply is excerpted below:
----
1) ETR-B would be perfect for all around single speed hard tails
2) Yes it's adjustable for different chain lines
3) The thickness of the aluminum where it mounts under the BB cup flange is .100
4) yes it is adjustable from 30 tooth all the way to 48 tooth
5) We're working on the PDF Manual / Parts list at the moment. It will be available for download off the internet once it's ready
----
  • + 1
 yeah, i just used to use a regular chain tensioner on the front of my single speed and nothing on the rear and it worked a lot better than those little no-railleur ones.
  • + 1
 i hate ALL chain tensioners. they never work the way they should. get a hor DO frame if you want to run ss
  • + 3
 bem bolado!!!
  • + 0
 If they are both short travel set ups could you use both together on a long travel bike??
  • + 0
 i used my old chain guide as a tensioner before worked much better then some of the other ones ive used
  • + 1
 dude these hav been out for years E 13!!!!!!!
  • + 1
 being an engineer must be cool i love trains
  • + 0
 haha sick!! i might get one of those my self yo ;p
  • + 0
 all i have to say is i like the sounds of it
  • + 0
 Any idea how much travel it can handle?? DH single speed fun!!
  • + 0
 Looks like a quality ststem,but yes old news.
  • + 0
 Aluminum is white metal...it Breaks too...
  • - 1
 what if you have bmx cranks and small sprockets, would this work with a sub 30 tooth?
  • - 1
 dmr did this years ago!

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