My wife recently got a new Trek OCLV bike, with a triple chain ring. The front der appears to be correctly adjusted -- it shifts perfectly on the workstand. However, she's dumped the chain to the inside at least once on every ride. Today, we had to break the chain to get it unjammed. Fortunately, I had a spare Wipperman master link with me, which seemed to work perfectly with the Shimano chain. On my (steel) bike, a jump stop (http://www.gvtc.com/~ngear/whatis.html) prevents this sort of thing very effectively. The OCLV frame is so gussetted and irregular near the bottom bracket, where the jump stop would have to go, that it doesn't appear that any sort of clamp would keep it in place.
Has anyone come up with a way to install a jump stop, or something like it, on an OCLV frame?
-JR
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My wife recently got a new Trek OCLV bike, with a triple chain ring. The>front der appears to be correctly adjusted -- it shifts perfectly on the>workstand. However, she's dumped the chain to the inside at least once on>every ride. Today, we had to break the chain to get it unjammed.>Fortunately, I had a spare Wipperman master link with me, which seemed to>work perfectly with the Shimano chain. On my (steel) bike, a jump stop>(http://www.gvtc.com/~ngear/whatis.html) prevents this sort of thing very>effectively. The OCLV frame is so gussetted and irregular near the bottom>bracket, where the jump stop would have to go, that it doesn't appear that>any sort of clamp would keep it in place.>
Has anyone come up with a way to install a jump stop, or something like it,>on an OCLV frame?>
-JR>
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Dear James,
There's a part from Trek that may help if you don't have it already:
<carlfogel@comcast.net> wrote in message news:k60m6116f5745foh5ts4cehrvkv1sbhcvu@4ax.com...> On Sat, 23 Apr 2005 18:19:56 -0700, "James Fitch"> <jfitch@nospamnet.net> wrote:>
My wife recently got a new Trek OCLV bike, with a triple chain ring. The> >front der appears to be correctly adjusted -- it shifts perfectly on the> >workstand. However, she's dumped the chain to the inside at least once on> >every ride. Today, we had to break the chain to get it unjammed.> >Fortunately, I had a spare Wipperman master link with me, which seemed to> >work perfectly with the Shimano chain. On my (steel) bike, a jump stop> >(http://www.gvtc.com/~ngear/whatis.html) prevents this sort of thing very> >effectively. The OCLV frame is so gussetted and irregular near the bottom> >bracket, where the jump stop would have to go, that it doesn't appear
that> >any sort of clamp would keep it in place.> >
Has anyone come up with a way to install a jump stop, or something like
it,> >on an OCLV frame?> >
-JR> >
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Dear James,>
There's a part from Trek that may help if you don't have it> already:>
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My wife recently got a new Trek OCLV bike, with a triple chain>>ring. The front der appears to be correctly adjusted -- it shifts>>perfectly on the workstand. However, she's dumped the chain to the>>inside at least once on every ride. Today, we had to break the>>chain to get it unjammed. Fortunately, I had a spare Wipperman>>master link with me, which seemed to work perfectly with the>>Shimano chain. On my (steel) bike, a jump stop >>(http://www.gvtc.com/~ngear/whatis.html) prevents this sort of>>thing very effectively. The OCLV frame is so gussetted and>>irregular near the bottom bracket, where the jump stop would have>>to go, that it doesn't appear that any sort of clamp would keep it>>in place. >>
Has anyone come up with a way to install a jump stop, or something>>like it, on an OCLV frame?
Dear James,>
There's a part from Trek that may help if you don't have it> already:>
That big washer thingy doesn't stop the chain from jumping off, it just keeps it from jamming between the chainring and the frame -- a great idea, but it won't solve the jumping problem. My current Trek has the washer, along with protruding "tongues" on the inside of the smallest chainring that overlap the washer, so there's no gap for the chain to sneak into.
When I first got my Trek, it would frequently throw the chain off to the inside, despite numerous adjustments by me and the LBS. Finally the LBS removed a couple of links from the chain, and the problem disappeared. You might want to have the dealer check that the chain length is correct.
"philcycles" <philcycles@aol.com> wrote in message news:1114360550.361519.272660@z14g2000cwz.googlegroups.com...> My wife recently got a new Trek OCLV bike, with a triple chain ring.> The> front der appears to be correctly adjusted -- it shifts perfectly on> the> workstand. However, she's dumped the chain to the inside at least once> on> every ride.>
Why not touch up the adjustment so that it shifts correctly on the> road? Just takes a screwdriver.> Phil Brown>
Interesting idea. Would the shifting on the road be that much different from shifting on the workstand? Certainly, on the workstand the drive train is subject to much less strain...
-JF
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Interesting idea. Would the shifting on the road be that much different from>shifting on the workstand? Certainly, on the workstand the drive train is>subject to much less strain...
In my experience, I can setup a bike that I cannot get to drop the chain on the stand and it will drop when riding. Also, the shift from a smaller to larger chainring on the stand happens easier than it does while riding and under load.
"Paul Kopit" <p.kopitREMOVE@SPAMverizon.net> wrote in message news:ovop61l01aimlbuc92jltgl0d7rf2kg2pv@4ax.com...> On Sun, 24 Apr 2005 13:00:00 -0700, "James Fitch"> <jfitch@nospamnet.net> wrote:>
Interesting idea. Would the shifting on the road be that much different >>from>>shifting on the workstand? Certainly, on the workstand the drive train is>>subject to much less strain...>
In my experience, I can setup a bike that I cannot get to drop the> chain on the stand and it will drop when riding. Also, the shift from> a smaller to larger chainring on the stand happens easier than it does> while riding and under load.
For some reason my browser is not picking up on the full thread here and I can't see the original post. Forgive me if I'm wrong about this, but I presume the poster was looking for a jump-stop that will work with the flared tubing an OCLV frame has just above the bottom bracket.
I had real problems dropping my chain when I switched to a carbon crankset. I ordered a Jump Stop from N-gear, but it wouldn't work. I fashioned my own little item from a piece of metal roofing material that I attached with a couple of zip-ties. My little device weighs almost nothing ... only a fraction of what the Jump Stop weighs ... and costs almost nothing. And it's worked absolutely flawlessly for well over 5,000 hilly miles now. I haven't dropped the chain a single time since I installed the thing.
I've taken some pics I can share with the OP if they want to let me know their e-mail address.
-- Bob C.
"Of course it hurts. The trick is not minding that it hurts." T. E. Lawrence (of Arabia)
