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Need help with triple upgrade...What can I do?(8 posts)

Need help with triple upgrade...What can I do?Lone Gunman
May 4, 2003 5:18 PM
I am upgrading the drivetrain from Ultegra triple with 10-12,000 miles to DA triple. Am buying STI, F&RD, chain as my cassette is good and I will be buying a middle chainring for the Ultegra crank so I will basically have a new drivetrain. Also putting in a new Ultegra BB.

Here is the problem where I need some direction; I would like to put on a 39t ring in place of the stock 42t on the crank. This ring MUST be 130mm pattern, must have ramps and pins. Shimano does not make such animal for the Ultegra lineup crank and I am unsure if the DA 39t triple ring works on the Ultegra. I read Sheldon Browns piece about DA triple and a unique bolt pattern but not sure I understand how I apply that knowledge to my situation without the parts in hand. Off brand parts are an acceptable alternative like Sugino or TA.

Any suggestions how I get a 39t to work?
re:Buy an aftermarket ring...nmRusty Coggs
May 4, 2003 5:57 PM
nm
re:Buy an aftermarket ring...nmLone Gunman
May 4, 2003 6:24 PM
Is the simple answer. Which one? Who sells/mfgs has the ramps and pins ring needed for a triple? Already tried a straight 39t ring once upon a time, it does not work.
Buy an aftermarket ring... ....heredavet
May 4, 2003 7:24 PM
Specialties TA makes what you want, available at Peter White Cycles: http://www.peterwhitecycles.com/chainrings.asp (scroll down to '130mm Bolt Circle "Alize"', a little better than half way down the page.

The TA chainrings are also available at Harris Cyclery and Rivendell Bikes and can also be ordered from your LBS.
Thanks davet for link....Lone Gunman
May 5, 2003 5:01 PM
I think I understand why Shimano does not make a specific 39 tooth ring for the Ultegra triple. It would outrage it's customer base that would need to then buy a different front deraileur just to make a 39t ring work properly on Ultegra triple system, designed for a 10 tooth difference, big ring to middle ring.

Sooo.. after reading PeterWhite info it sounds like I can get a 39t TA ring and the new DA FD and I have the gearing I want.
Shimano 105 Ringsss-nyc
May 5, 2003 4:01 AM
You may need to replace the 52 as well since they are designed to work together as a pair. Shimano makes 2 different 52s to work with a 42 or 39.

Get them from Nashbar becasue they are inexpensive and I doubt anybody can prove a difference in the chainrings from Ultegra to 105. The crank arms are usually different but not the rings in the 105/Ultegra/Dura-Ace groups.

39T $14.95
52T $24.95

hope this helps.

http://www.nashbar.com/profile.cfm?category=81&subcategory=1032&brand=&sku=2923&storetype=&estoreid=
I use a standard 39T Ultegra ring on my triple.terry b
May 5, 2003 8:19 AM
It works fine. Didn't like the 42T so took it off and replaced it with the 39T that came with my Ultegra double crank.
re: Need help with triple upgrade...What can I do?CurtSD
May 5, 2003 12:37 PM
I think TA is your best bet for a 38t MIDDLE ring. If you try to use a 39t (inner) ring meant for a double crank it won't have the pins for upshifting from the granny ring. The DuraAce middle chainring won't work because it has tabs (the small chainring bolts to the tabs on the middle chainring) that will make it impossible to install it on your Ultegra crankset (unless you want to grind off the tabs).