Thanks for the real life examples. I will not be adding a shim to the rear cog or front rings as
suggested; this is beyond my scope of knowledge at this time. I have really appreciated all of the
advice on this topic and I have changed my gear selection accordingly. I'm glad I asked as I have
learned something new!
Joel R "Mark Lee" <
[email protected]> wrote in message
news:[email protected]...
>
> "Joel Rose" <
[email protected]> wrote in message
>
> >>SNIP<<
> > while in the smaller front ring ... the chain rubs against the "inside" of the larger ring while
> > shifting into #8 and 9 gears. ... ... any advice as to what is the problem ...
>
> Joel, The problem is: you are using extreme crossover. Don't do it.
> 1. Why? D A N G E R An inexperienced but strong young rider (Under 19 - 6'2") in the 60-strong
> training bunch last Saturday DID and when he sprinted up a hill, the chain sucked and jumped
> off - pulling his left foot and throwing him over the
bars
> to the left at 35kph. He sustained a big chainring bite on the ankle and lost a bit of skin and
> claret from various parts of his body - his back (&
a
> leg) is still stiff as of last night out at the Velodrome racing - and his mobile phone looked
> like something found under the wreckage of the twin towers. The guy on his wheel wasn't so lucky -
> dislocated shoulder - and another came down too. My 12 yr old son just managed to squeeze around.
> They were chasing me and I could hear what sounded like an avalanche of light metal rolling and
> building speed behind me. I stayed out of the saddle, sprinting, until the noise no longer
> threatened to engulf me.
> 2. Why? W E A R & T E A R Small cogs, lots of chain flex/angle and higher chain tension.
> 3. Why? Evidence of inexperience. It's just not the way things are done by
cyclists
> who want the most out of their sport. That crossover is what is known in Australia as a
> "gumby" gear.
>
> You've done the right thing asking about it. Mark Lee