Won't shift onto biggest cog

Quick question for those of you who are a lot more mechanically
inclined than me.

The shifting on my bike (Jamis Xenith Comp with Ultegra derailer)
hasn't been all that crisp lately. Upshifts were a bit slow while on
the big chainring but not so bad on the small chainring, so I figured
the derailer hanger was a bit bent.

When I eyeballed the hanger, it didn't seem so bad, but I removed the
derailer and tugged it out a hair to make it as in line with the cogs
as I could.

Now, for the life of me, I can't get the bike to shift on to the
largest cog. The rest of the shifting seems okay but with the
exception that when I try to get it onto that largest cog, it almost
hops up there and bounces back and forth between the largest and
second to largest.

Any suggestions are welcome.

Thanks.

On May 27, 7:15*am, wrote:
Quick question for those of you who are a lot more mechanically
inclined than me.

The shifting on my bike (Jamis Xenith Comp with Ultegra derailer)
hasn't been all that crisp lately. Upshifts were a bit slow while on
the big chainring but not so bad on the small chainring, so I figured
the derailer hanger was a bit bent.

When I eyeballed the hanger, it didn't seem so bad, but I removed the
derailer and tugged it out a hair to make it as in line with the cogs
as I could.

Now, for the life of me, I can't get the bike to shift on to the
largest cog. The rest of the shifting seems okay but with the
exception that when I try to get it onto that largest cog, it almost
hops up there and bounces back and forth between the largest and
second to largest.

Any suggestions are welcome.

Thanks.

If the der hanger is bent, go yo a bike shop that has the proper tool
to check it and then adjust RD. Shift to highest gear(smallest cog),
adjust limit screw, barrell adjust all the way in, secure der cable to
under bolt and plate(not thru), shift to next cog, align chain/pulley
with cog, shift up until last/lowest gear(biggest cog), adjust that
limit screw.

wrote:
Quick question for those of you who are a lot more mechanically
inclined than me.

The shifting on my bike (Jamis Xenith Comp with Ultegra derailer)
hasn't been all that crisp lately. Upshifts were a bit slow while on
the big chainring but not so bad on the small chainring, so I figured
the derailer hanger was a bit bent.

When I eyeballed the hanger, it didn't seem so bad, but I removed the
derailer and tugged it out a hair to make it as in line with the cogs
as I could.

Now, for the life of me, I can't get the bike to shift on to the
largest cog. The rest of the shifting seems okay but with the
exception that when I try to get it onto that largest cog, it almost
hops up there and bounces back and forth between the largest and
second to largest.

Any suggestions are welcome.

Thanks.

Maybe you've given away the last click in the shifter by having the
cable slack in 10th gear

--
/Marten

info(apestaartje)m-gineering(punt)nl

The shifting on my bike (Jamis Xenith Comp with Ultegra derailer)
hasn't been all that crisp lately.

Just a noob here, but if this is the rear derailleur, check for play in
the upper plastic cog the chain goes around. The manual I've read says this
is the main source of shifting sloppiness.

rms

In article 4c8537d3-02e7-4307-90d4-
,
says...


Quick question for those of you who are a lot more mechanically
inclined than me.

The shifting on my bike (Jamis Xenith Comp with Ultegra derailer)
hasn't been all that crisp lately. Upshifts were a bit slow while on
the big chainring but not so bad on the small chainring, so I figured
the derailer hanger was a bit bent.

When I eyeballed the hanger, it didn't seem so bad, but I removed the
derailer and tugged it out a hair to make it as in line with the cogs
as I could.

Now, for the life of me, I can't get the bike to shift on to the
largest cog. The rest of the shifting seems okay but with the
exception that when I try to get it onto that largest cog, it almost
hops up there and bounces back and forth between the largest and
second to largest.

Any suggestions are welcome.

Thanks.
Will it stay on the largest cog if you shift by pulling the cable and holding
it onto the cog? If so then there could be too much play in the cable. If
it won't shift and stay by pulling on the cable, try resetting the limit
screw on the derailleur and then the "b" screw.

On May 27, 8:15*am, wrote:
Quick question for those of you who are a lot more mechanically
inclined than me.

The shifting on my bike (Jamis Xenith Comp with Ultegra derailer)
hasn't been all that crisp lately. Upshifts were a bit slow while on
the big chainring but not so bad on the small chainring, so I figured
the derailer hanger was a bit bent.

When I eyeballed the hanger, it didn't seem so bad, but I removed the
derailer and tugged it out a hair to make it as in line with the cogs
as I could.

Now, for the life of me, I can't get the bike to shift on to the
largest cog. The rest of the shifting seems okay but with the
exception that when I try to get it onto that largest cog, it almost
hops up there and bounces back and forth between the largest and
second to largest.


Sounds like you need to back our your L screw.

On 2008-05-27, rms wrote:
The shifting on my bike (Jamis Xenith Comp with Ultegra derailer)
hasn't been all that crisp lately.

Just a noob here, but if this is the rear derailleur, check for play in
the upper plastic cog the chain goes around. The manual I've read says this
is the main source of shifting sloppiness.

Maybe, except those upper plastic cogs usually have a lot of play in
them. I heard they are designed like that deliberately since it makes
for smoother running with indexed gears.

So, how much play is too much... I don't know, but they are supposed to
wobble a fair bit.

On May 28, 12:51 am, Ben C wrote:
On 2008-05-27, rms wrote:

The shifting on my bike (Jamis Xenith Comp with Ultegra derailer)
hasn't been all that crisp lately.

Just a noob here, but if this is the rear derailleur, check for play in
the upper plastic cog the chain goes around. The manual I've read says this
is the main source of shifting sloppiness.

Maybe, except those upper plastic cogs usually have a lot of play in
them. I heard they are designed like that deliberately since it makes
for smoother running with indexed gears.

So, how much play is too much... I don't know, but they are supposed to
wobble a fair bit.

Get rid of the indexing - use a friction shifter, it gives so much
more flexibility!

wrote in message
...

Get rid of the indexing - use a friction shifter, it gives so much
more flexibility!

And use wooden wheels so that you never get another flat.

Tom Kunich wrote:
wrote in message
...

Get rid of the indexing - use a friction shifter, it gives so much
more flexibility!

And use wooden wheels so that you never get another flat.



Hé, be careful with the 'only steel is real, downtube friction shifters,
6 speed is enough, horizontal top tube' fundamentalists...

Lou