Why no J-Swingarm
Anyone heard why no current Lefty has a J-swingarm. Too many failures?
What's the official word?
Mine is still going strong.
J-swingarm? A swingarm on a Lefty? You mean like those USE Sub forks?
What are you talking about ??
Suppose he means the rear swingarm style (overhand?) from the Rush and Prophet series of bikes instead of the chainstay-seatstay style on the rest of them.
Perhaps it is weight related. Those swingarms have to be pretty heavy and the pivot has to be extra beefy as well. It also could be front-derailleur related, both space and maintenance. On the Rush at least, the FD is right in the path of all the gunk from the rear tire. I put a fender on the rear of my son's Rush that keeps it cleaner.
2013 Ibis Ripley
2012 Ibis Mojo SL-R
2009 C'dale Rize 3
Originally Posted by Dan Gerous
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Haaa yes... but why do you want them? As pointed above, they have to be much heavier to have a comparable stiffness since their shape and geometry really makes it flexier (they're more or less longer and the very small angle between the chain and seatstays also hurts), the Prophet and Rush swingarms were their achille's heel, very flexy even though they were big. That and yes, the front derailleur thing can be an issue too. Basically, they don't use it anymore because the can make a stiffer, lighter frame without them. The only advantage they had is that you could take the chain off without breaking it open... and that if the chain sucked, it didn't hit the chainstay... but that's not worth sacrificing weight and stiffness for.
You mentioned a Lefty, that's why we were all confused, I thought you were referring to something like the USE SUB anti-dive fork.