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Chain crossing(3 posts)

Chain crossingMatteo
Oct 20, 2002 11:49 AM
Hi there,

I have an Ultegra 53/42/30 - 13/14/15/16/17/18/19/21/23

How much can I cross the chain?

Is 53/21 a bit too much?
And 30/14?

Thank you,

Matteo
Depends on your set upKerry
Oct 20, 2002 3:30 PM
The limit on small-small crossing is typically either the chain rubbing on the next larger chain ring or the chain going slack. On large-large combinations, it will depend on the chain length and cross angle. Chain length should be set up so that you could ride in the large-large combo, otherwise you run the risk of destroying your derailleur and/or chain if you accidentally shift to the large-large. After that, it will depend on your chain line and chain stay length. On my 39/53, 13-23 9 speed, I can ride in the 53/23 with no problems or complaints from the drive chain (no noise or "auto shifting"). On a triple, the large chainring is shifted farther to the right, which makes the large-large combo more of a challenge, but if you are not hearing extra noise, you probably don't have a problem. Many people say never to ride in the large-large, but I do it all the time and have for the past 5 seasons.
Recommendation from Shimano-Europe.comjohnnybegood
Oct 21, 2002 6:33 PM
go to http://www.shimano-europe.com. click on the link for "road racing", then the link for "tips". Choose the link for "Best gear combinations." There are diagrams and explanations for optimal gear combinations for doubles and triples. I've said it before, and I'll say it again: one of the best technical websites out there for Shimano stuff.