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Switching an Ultegra Triple to 52-39-30(13 posts)

Switching an Ultegra Triple to 52-39-30abelson
Feb 7, 2003 11:04 PM
My LBS is building up a new bike for me. Does anyone know if it is possible to swtich out the 42t chainring for a 39 on an Ultegra triple? I would much rather have the 39 but I don't want to screw up my shifting either. I don't have the bucks to upgrade to the Dura Ace triple.
Feb 8, 2003 12:28 AM
honestly I like 42 more then 39. Give it a try. Transition from 52 to 42 is much smoother and with 12-27 cass you'd need 30 only on very very steep hills.
Why not......Rusty Coggs
Feb 8, 2003 6:25 AM
I like a 39 middle better,and a 23 big cog too.It's just different strokes.
Feb 8, 2003 7:46 AM
I am putting a 12-27 cassete on but I still prefer the 39 to the 42. I am a big time spinner and I like the gear range that the 39 offers better while saving the 30 for those really big hills
I agreejtolleson
Feb 8, 2003 8:08 AM
Having switched from an Ultegra triple with a 42 to a D/A triple with a 39, I realize I'm almost never in granny except in the most desperate (15 percent grade etc) situations. With the 42, I was in granny a lot more often.

I think it has helped my riding. I ride my bike now much more like a "double with emergency backup" than I used to.
re: I agreecyclopathic
Feb 9, 2003 6:41 AM
what are you running in back? 42x27 is like 39x25 and 42x25 is like 39x23.
re: Switching an Ultegra Triple to 52-39-30varmit
Feb 8, 2003 7:58 AM
The chainring shifting won't work if you only change the middle chain ring. I have tried this myself. The Ultegra front derailler is ramped for a 10 tooth differance, so it doesn't allow the chain to drop onto the 39 on a down shift.
I agree that a 39 is much more useful. If you are sure that you want an Ultegra triple, you have 2 options for using a 39: Also replace the big ring with a 50 tooth (My solution) or, use a Dura Ace triple front derailler. I ran this setup on a bike for a year or two. With the 50 chain ring, if you are concerned about top end speed, you can use an 11 X 21 in back.

I finally did away with the triple as no ammount of adjusting would get smooth shifts from the front STI lever.
re: Switching an Ultegra Triple to 52-39-30abelson
Feb 8, 2003 9:31 AM
Hmm so it sounds like my best bet would be to use a Dura Ace front derailler and either a 53-39-30 or a 52-38-30 (I think the Dura Ace deriallers are optimized for a 14 tooth difference). Should this shift ok with Ultegra STI levers?
re: It's a minimum of 10 teeth difference.Rusty Coggs
Feb 8, 2003 3:38 PM
Front DerailleurMrDan
Feb 8, 2003 3:52 PM
Don't they make a wide range (triple) Ultegra?
"I did away with the triple....(because of) front STI lever"Ray Sachs
Feb 9, 2003 4:40 AM
I took the opposite approach - got rid of the front STI lever for a barcon (or downtube shifter), which allows me to use whatever chainring setup I want. Indexed shifting (STI or otherwise) is great on the back and works just fine with a double up front, but on my triple chainring bikes (touring and offroad), friction works MUCH better.

"I did away with the triple....(because of) front STI lever"abelson
Feb 9, 2003 6:16 AM
I was considering that approach with a downtube shifter (I really don't like Barcons) but I like things to be symmetrical and I knew that having a different brake lever with a smaller area on top of the hoods to place my hands would drive me nuts. I also like a wider area on the top of the hoods.
You could leave the STI lever on...Ray Sachs
Feb 9, 2003 1:27 PM
...and just disconnect the shifter cable. Use it as the brake lever. You'd have the same feel on the hood and if symmetry is really critical, you could probably even glue the cable housing in place so it would LOOK like you had a cable there :)

Just another possibility. It'd be cheaper than buying another brake lever too.