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Discussion in 'Downhill & Freeride' started by rbx, Sep 5, 2005.
Dindt find any do you guys know of any other brands?(real jackshaft not pulley system a la bb7)
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clifcat and balfa made jackshaft bikes, there are more in europe too.
i think theyre called the holeshot and nouvau riche respectively.
oh and do a search for devinci big bang
would the cannondale fulcrum qualify? they weren't issued for sale, though, i believe.
didnt gack make one?
Checking clifcat website i think they dont make jackshaft bike anymore
Also looking for frames still in production,the gack seems ok, oh well seems that i am going to have to go with the BMW(not that is bad far from it but the price!!..ouch)
all the jackshaft bikes were super expensive. the Gack is a cheaper version of the BMW but still a lot. the Clifcat weighed more then i care to post, and had something like 10-11inch of travel. get a bmw. i enjoy mine.
Once you add in the cranks,bb and the guide. The bike in not that much more than other things
Clifcat can still make them they're special ordered.
I remember talking to Bill (Clifcat owner) about it a few years ago and he said to save weight he would sometimes put a pulley at the pivot to simulate a jackshaft. He said it felt just as good.
I keep reading and hearing that bikes with pulleys like balfas dont pedal well not because of bad suspension design,but of friction created by the pulley.
I maybe way off
I don't see how there could be much less friction with a true jackshaft frame: You have your main bottom bracket at the bottom where your cranks are, with a chain driving the other chainring attached to the pivot (on the Clifcat bikes it was a second Profile bottom bracket in the pivot), which drives the chainring on the other side of the frame which drives the rear wheel.
I may be way off too.
What is that new GT - IT bike? And how 'bout Zedro's file cabinet?
Haven't heard much news about that new GT bike lately...
And zedro's bike has a pulley, no jackshaft.
That may actually be the ugliest bike I've ever seen in my life. What on earth were they thinking?
nah it needs green doublewides and a bannana seat
Totally forgot about the GT-It1 ok i think my problem is solved thanks for the help guys!
Hold on a sec...apparently there's been some e-rumours and e-speculation going around saying they're having trouble with the Nexus hub.
Drops to flat.
What I dont get is why they are running that funky azonic stem...as if the front end wasn't high enough already?
Weird the last i heard from a thread on RM is that GT worked with shimano and solved the problem..but i am still confused??
Ostie de Gt ils le sortiront jamais leur bike!
I missed that part about Shimano fixing their problem.
They werent thinking!
The front of that looks higher than an MXer.
aint it a mr dirt stem? or am i stoned
so shimano fixed their problem. doesn't change the fact that the GT has 19" chainstays.
i don't feel any of this tension on the right side or left side of my BMW, i could feel it on the balfa though, but can't feel it on the canfield.
A Nucleon owner posts in the thread and no mention of the Nucleon...?
A kiwi posts and no mention of Lahar??
Ahhh...that's because the Nucleon ST isn't a 100% true jackshaft bike.
The Nucleon TST is just way expensive right now.
The Nucleon ST doesn't have the Rolhoff hub in the pivot. It's just ahead of it. There's almost no chainstretch but there is still some...so that why I have to run that Rohloff tensioner.
The Nucleon TST does have the gear hub in the pivot so it could be seen as a jackshaft system...unless I'm missing something.
ah...ok trade me your Nicolai ST for a KHS Dominatrix
Well the Lahar isnt really a jackshaft bike! Which is what the thread is all aboot.
They are well tasty though laddie!
Where's the Rohloff mounted, then? Right at the crank or something? I thought it used a primary/secondary drive configuration...my bad...
Ed: I guess it has to have a primary/secondary if it's got a rohloff...just that they're not arranged in a jackshaft layout.
here's the config (that's the main pivot behind the hub):
Geez just got the geo. specs for IT1 the chainstay is 17.75" with no sag!!
At 30-35% sag it close to 18.94"!!! thats damn to long...way to ruin a good idea