I have noticed that some hangers have the stop part of the hanger is very different places than others. For example I had a yeti sb150 and it had such a weird hanger compared to any other bike I have owned, and b tension was vastly different.
Agree with those points and not searching for something to criticize. Would just like to hear trek address it and explain why it’s not an issue.
I'm not totally convinced it's a good idea to have the derailleur shear the carbon.
It's not shearing the carbon unless the axle isn't in place, with the axle in place, the axle takes the loads.
So, what you’re saying is that this guys knows better than SRAM’s engineers. Oh, I’m rolling!
It's not those kinds of loads that will shear. Those will pass to the stays. But if the derailleur rotates upwards like in the case you get a stick in the wheel something have to give and it is designed to rotate up, but now there is a shearing shim clamped to the frame with 35nm.
There's a thread already discussing this so I won't say much as it's then running in parallel and off topic for this thread, but ..So, what you’re saying is that this guys knows better than SRAM’s engineers. Oh, I’m rolling!
www.emtbforums.com
www.emtbforums.com
Yes it could rotate,but that the same risk as you have now with the udh. There's a few trek rails that have damaged the seat stay when the derailleur rotated round and the udh didn't break away. Not seen any fuel exe suffer from this yet....
His argument about alignment is bogus. Number one if your frame is out of alignment, you would know that ahead of time. And, number two, even if it is slightly out of alignment once you put the axle through everything and tighten it up, the derailer will become aligned with the cassette. And, it would take an Infiniti of wheel removals for that washer to do any damage to the carbon. This clown is just trying to get YouTube hits.
it's supposed to rotate by design, but I guess it doesn't get stopped correctly on some models.
That one certainly have some entertainment value and I think they do a good job, but I suspect it is these guys PT was referencing in regards to the shearing of the frame at the axle, in his video.
That was my first thought- and that the more you screw in the B-tension, maybe it exaggerates any alignment issues.
I agree with the comment as a general sentiment about armchair engineers, but the bike industry has cranked A LOT of products that turned out to be bad ideas. For example, that used to be the sole activity of crank brothers.So, what you’re saying is that this guys knows better than SRAM’s engineers. Oh, I’m rolling!
But, has SRAM ever done that?
I agree this conversation is more interesting than work
Would you read anything into the fact Trek specs a lower than normal torque value for the UDH (or at least that’s my recollection for the manual)? I’m already concerned about the longevity of all of the bearings b/c they are itty, bitty compared to the pivot bearing on other bikes I’ve owned.
I’m sure it’s already been said below, but REVERB!
Good thinking. I would think the main failure mode in the axle bearings is Brinelling. There is so little rotation there that the balls tend to stay in the same location and wear a pit into the race. All APB bikes now have two expensive structures (chain stays and seat stays) co-located with the wheel and mech. You are asking a ton to fit into a small place. A crash may result in multiple, expensive, structural failures. A Horst link puts the structural pivot separate and can be designed with some beef. Way prefer that but sometimes the patent office tells us what we are allowed to ride.
To be fair, that was not what he said.I agree this conversation is more interesting than work
And we have SRAM to thank for the Reverb seatpost. So we know they are capable of designing & selling disposable garbage.
The youtube engineer dude lost me when he started talking about derailer hangers being necessary to keep the derailleur aligned with the frame. That's nonsense- derailleur needs to be aligned with the axle & cassette, which is the benefit SRAM's touting. Makes sense to me.
What doesn't make sense (to me) is the cost. I do hope it trickles down to the GX price point, even if it's only the cassette, chain and DM standard.
Yeah, I can't say I watched the whole thing, I think we agree.
nsmb.com
Not disagreeing with your point, but I would note that a hanger doesn't protect your bike from the stick-in-wheel scenario you describe
ethirteen.eu
www.ebike24.com
I need the spider to be able to run the new TT Groupset, the chain doesn‘t work with the e13 chainring.cant you just order from e13 ?
E*Thirteen
Our new direct mount e*spec chainrings use our new M3 narrow-wide tooth profile, which reduces weight without sacrificing chain-retention. In making our SL and UL chainrings lighter and more beautiful than their predecessors, we adapted a similar design to work with Bosch, Brose, Fazua and...
ahh ok now I understand.
