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Need advise (STI shifters)(7 posts)

Need advise (STI shifters)Chechu
Jan 16, 2003 2:24 AM
I am going to buy a new pair of Ultegra STI´s but I am not sure to buy the triple or the double ring version.

Anyone knows if the distance beetwen the rings are the same?
I mean: Could I use triple levers with two rings cranksets? (Of course, I know that I´ll need to readjust the front derailleur to prevent the fall of the chain, etc)

More cuestions: Which other parts need to be specific to mount a triple crankset? Bottom Braket (chainline...), derailleurs.

Thanks in advance!
They're common (nm)cyclequip
Jan 16, 2003 5:06 AM
They shift a double or triple,same part # for either...nmRusty Coggs
Jan 16, 2003 6:08 AM
nm
Shifters, believe it or not, are the same.Spoke Wrench
Jan 16, 2003 5:59 AM
As a double, I get two shift positions for each chainring. As a triple, I get two shift positions for the middle chainring and one each for the other two.

If you want a factory looking triple installation, you will need, in addition to the crankset, a longer bottom bracket and new front and rear derailleurs.
Which leads to an interesting glitch with the STI double setupNiwot
Jan 18, 2003 12:33 AM
When shifting up from the small chainring to the big ring in a double, if you make a very hard shift (i.e., if you just shove the lever in hard and quickly) you can actually just drop the chain -- the chain is pushed right over the big chainring and it drops off.

BTW, Dura Ace has long had two shift positions for each ring, even with 8-speed D-A, long before the introduction of road triples.
Mine doesn't.Spoke Wrench
Jan 18, 2003 6:51 AM
I have an Ultegra double on my road bike and an Ultegra triple on my tandem. I assume the shifters are the same because they are both two buttom flight decks which were only offered for a year or so. The two bikes shift just fine for me just as I described. I can't recall ever dropping a chain on either.
Thanks guys! - nm -Chechu
Jan 18, 2003 8:36 AM
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