R
Roland Wooster
Guest
I've just switched my 52/42/30 Ultegra granny gear to a 26 (stainless steel, specialized pro). The
teeth are all identical, there appears to be no special ramp up or down modifications, but then
again there doesn't seem to be much in the way of modifications for this purpose on the 30T either
(unlike the 42T).
However, the shifting from the middle gear to the granny often drops the chain past the granny and
on to the frame. I could adjust the end stop of the front derailleur, but the problem there is it
already rubs in first gear anyway.
The other problem is that when shifting up from granny to the middle gear it often "misses" the
middle gear jumps a little, then attemps to fall back onto the granny, but as the chain is so
twisted by this point it misses the granny and falls onto the frame again.
I'm pretty certain I got the crank back on the bottom bracket to a very similar spacing as when I
took it off, as I use a torque wrench putting it on, so have a reasonable certainty the chain line
is the same. And after the shifting failure I went back to the 30T and it works like normal again.
Any suggestions? Is there some kind of device you can bolt on with the granny, using the granny's
74mm bolt spacing that acts as an inner chain deflector so it can't derail itself?
Thanks, Roland
teeth are all identical, there appears to be no special ramp up or down modifications, but then
again there doesn't seem to be much in the way of modifications for this purpose on the 30T either
(unlike the 42T).
However, the shifting from the middle gear to the granny often drops the chain past the granny and
on to the frame. I could adjust the end stop of the front derailleur, but the problem there is it
already rubs in first gear anyway.
The other problem is that when shifting up from granny to the middle gear it often "misses" the
middle gear jumps a little, then attemps to fall back onto the granny, but as the chain is so
twisted by this point it misses the granny and falls onto the frame again.
I'm pretty certain I got the crank back on the bottom bracket to a very similar spacing as when I
took it off, as I use a torque wrench putting it on, so have a reasonable certainty the chain line
is the same. And after the shifting failure I went back to the 30T and it works like normal again.
Any suggestions? Is there some kind of device you can bolt on with the granny, using the granny's
74mm bolt spacing that acts as an inner chain deflector so it can't derail itself?
Thanks, Roland