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windowlicker
(Aug 18, 2009 at 19:53)
Those dropouts are totally necessary. That headtube junction gusset is totally necessary.
I think it was!
But it's SS, which means you can use crappy suspension and people will buy it. Woot marketing hype.
But it's SS, which means you can use crappy suspension and people will buy it. Woot marketing hype.
URT's are the most overlooked suspension design in the MTB world. Their characteristics are defined entirely be the pivot placement, they fell out of favor due to some bike companies using ridiculous pivot placement, not mentioning any names but Klein springs to mind! Not to mention the many thousands of cheap far eastern copies. They were also not the best idea for XC while using the fairly basic shocks of that time and this was when XC ruled the roost and most journalists writing about bikes thought that DH was just a fad.. Sherbet, I think you must have fallen victim to the marketing hype which you mention for you to simply write off the design without fully understanding it. URT's are a stupid idea for XC but lend themselves perfectly for SS and 4X, basically the lower the pivot and the closer it is to the BB the smaller the difference between sitting and standing responsiveness. Contrary to what lights claimed, they are stiffer when standing (not while sitting) so on a bike which is intended for more gravity based riding they can be set up to be soft while standing as you rarely sit down. And because there are no pivots between the BB and rear axle, you also get uninterrupted power transfer, and nothing this side of a hardtail comes close to the lateral stiffness that this design can offer. They also remain fully active while on the brakes too. I applaud TwentyFour for using this design and feel that one major reason why more manufactures don't is due to the type of brainwashed bigotry which some people have so happily displayed here in such an uniformed manner, which is a hangover from a time when bikes where only judged on their XC abilities. My DH bike is a URT and it's the only DH bike I've kept for more than a year (I've had it for 5, been racing for 15) based entirely on the way the suspension works and the fact that there is simply nothing on the market which is worthy of replacing it. URT's rock!
I understand URT fully. Don't worry about that. I just don't like it. Your bb will be influenced by your rear end a hell of a lot more, and that's not ever going to be as smooth as most other designs. Why not just make it eccentric BB pivot?
wow this guy is a joke. lol obviously if he thinks URT's are the way to go... haha dude even riding a mongoose the freakin bb moves far to much and feels extremely weird.
screw URT's.
screw URT's.
Jwmbike14, thank you for proving my point about bigotry and by compering a Mongoose free-drive system to a URT, displaying just how little you know about suspension designs. On a low pivot URT, the BB actually moves less than it would on a conventional bike, when you also take into account fork movement. Conventional bikes now feel weird to me because the BB moves too much in relation to the rear axle. And I'm not saying that URT's are the way to go, I'm merely suggesting that they are a viable option overlooked by manufacturers for certain applications. So less of the personal insults please.
sherbet, I don't doubt your expertise but how much experience of riding URT's do you have because I must admit I was also a sceptic before all my friends I'd been beating for years started beating me on them so I bought one. Yes, in theory the BB will be effected and they shouldn't be as plush as a non URT design, but the difference on that front is minimal. The reality is quite different to what most people expect. All you have to do is run a softer spring than you would on a standard (compromised) single pivot bike. The advantages are instant power transfer, more feel through the pedals and fully active braking without the need for a floating caliper. The problem with BB pivots is that on a long travel bike, the axle path is too much of a vertical arc and is actually moving forwards at the end of the stroke. Any bike with a pivot forwards of the BB will have a more stable, rearwards arc to it's axle path. I'll admit that URTs are not for everyone, that's why we have so many suspension systems on the market, I personally wouldn't feel comfortable riding a single pivot cantilever beam design for DH, but many people are... I don't expect you to change your mind I just think the that URTs get an undeserved really bad rap.
sherbet, I don't doubt your expertise but how much experience of riding URT's do you have because I must admit I was also a sceptic before all my friends I'd been beating for years started beating me on them so I bought one. Yes, in theory the BB will be effected and they shouldn't be as plush as a non URT design, but the difference on that front is minimal. The reality is quite different to what most people expect. All you have to do is run a softer spring than you would on a standard (compromised) single pivot bike. The advantages are instant power transfer, more feel through the pedals and fully active braking without the need for a floating caliper. The problem with BB pivots is that on a long travel bike, the axle path is too much of a vertical arc and is actually moving forwards at the end of the stroke. Any bike with a pivot forwards of the BB will have a more stable, rearwards arc to it's axle path. I'll admit that URTs are not for everyone, that's why we have so many suspension systems on the market, I personally wouldn't feel comfortable riding a single pivot cantilever beam design for DH, but many people are... I don't expect you to change your mind I just think the that URTs get an undeserved really bad rap.
and this is where i start to question you're knowledge on suspension design and geometry. you are correct in saying "On a low pivot URT, the BB actually moves less than it would on a conventional bike," but only if you are referring to the movement of the BB in relation to the rear axle, however we don't care how the bb moves in relation to the axle ,we care about the geometry that you feel while RIDING the bicycle. the main thing about a URT is that it changes the front and center of a bike. meaning the BB moves away from the headtube, meaning your legs are moving in relation to the rest of your body. this is why URT's have been proven to be outdated technology. on a good frame your body position should not be manipulated by your suspension design.
and that barely touches the base of why URT's aren't great. for one the more travel they have the worse they get. your center of gravity is balanced on your legs. your weight is centered on your legs. so iwth a URT it is as if your body position isn't actually on a bike. the worse part is that if you are balanced then not so much does the BB move out from under you, infact its hardly that at all. but it changes your reach, and it will feel as if the headtube/handlebars are getting slacker and moving in towards you as the front wheel moves out and extends.
in theory they make no sense for any application
"Conventional bikes now feel weird to me because the BB moves too much in relation to the rear axle." in reality it doesn't matter how much the axle moves in relation to the BB, as it does not affect your riding. the motion of the axle depicts the characteristics of a suspension design and how it will feel over certain terrain. so you may simply like the axle path provided by a certain pivot location. however also what your statement claims is that the geometry will be constantly changing underneath you now that you move in relation to the rear axle.
i fail to see the truth in anything you speak?? can you please PM and explain where the hell you are getting your stuff?
in theory they make no sense for any application
"Conventional bikes now feel weird to me because the BB moves too much in relation to the rear axle." in reality it doesn't matter how much the axle moves in relation to the BB, as it does not affect your riding. the motion of the axle depicts the characteristics of a suspension design and how it will feel over certain terrain. so you may simply like the axle path provided by a certain pivot location. however also what your statement claims is that the geometry will be constantly changing underneath you now that you move in relation to the rear axle.
i fail to see the truth in anything you speak?? can you please PM and explain where the hell you are getting your stuff?
[Reply]
[Reply]
i dont agree with the bb placement, shock will be sent through the cranks over bumps, good for single speed, but thats about it
really dont see the point, in effect your legs stay still and the front of the bike moves..
i can't see it working any other way, unless the force is so great it can force the rear wheel up as well as your body wight, it just deems its self pointless. Maybe it works well, i'm no expert and nor have i ridden a URT frame in years but it's clearly a flawed design otherwise why don't you see it more often instead of just on Mr Bigs and Kwik-e-mart brand bikes.
Sticking the pivot around the BB and then having a much better suspension design is surely the way to go..?
i can't see it working any other way, unless the force is so great it can force the rear wheel up as well as your body wight, it just deems its self pointless. Maybe it works well, i'm no expert and nor have i ridden a URT frame in years but it's clearly a flawed design otherwise why don't you see it more often instead of just on Mr Bigs and Kwik-e-mart brand bikes.
Sticking the pivot around the BB and then having a much better suspension design is surely the way to go..?
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Gatineau, Quebec, Canada
1355 views | 35 comments | 69 faves
Date: 2009-08-18
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