|Triple Compatability Question||jmirza|
May 10, 2001 11:06 AM
I want to upgrade my bike from a double to a triple as cheaply as possible and was wondering if my 8-speed Ultegra 600 STI shifters and 8-speed cog would work with new Ultegra 9-speed triple front and rear derailleurs.
Basically, I'd like to avoid buying 9-speed STI and a 9-speed cog, which would at least double the cost of upgrading.
I'm hoping I can get away with buying:
Ultegra 9-speed front derailleur
Ultegra 9-speed rear derailleur
Ultegra triple crank
Ultegra triple bottom bracket (wider spindle)
Does anyone know if this will work?
Thanks a lot,
|Don't know for sure.||Spoke Wrench|
May 10, 2001 2:08 PM
|I think I'd go with a 9-speed chain too. I don't think you are going to have any problems with the rear shifting. If something doesn't work, it will be at the front. Even when all of the parts match, STI triples can sometimes be a bit of a pain to get working to my satisfaction.
Your new 9-speed front derailleur has a cage that is a hair narrower than the older 8-speed ones. I don't know for sure, but I suspect you will get some derailleur cage rub or unsatisfactory shifting if you use the wider 8-speed chain.
Now do me a favor. I answer lots of these kind of questions, and sometimes never hear from the questioners again. Please let me know what you did and if you tried an 8-speed or 9-speed chain and how it worked out.
May 10, 2001 2:19 PM
|8 speed ultegra STI shifters will NOT shift a triple. There are 8 speed 105,RX-100 RSX and Sora shifters are/were triple specific.You may as well just bit the bullet and get a deal on the whole grooup. 105 might serve as well and would be less expensive.|
|I think he's right||Spoke Wrench|
May 10, 2001 2:37 PM
|I just took the time to find my two year old QBP catalogue. Shimano doesn't list them (Shimano part number ST 6400) as triple compatable.|
|No, Sir!||grz mnky|
May 10, 2001 6:20 PM
|You need a different front shifter if you want to get 3 postions for the triple crank, plus the spacing is narrower. 8 speed STI won't do it. Next you have a problem with the spacing and the rear cassette. 9 gears taking up the same room as 8. You could actually use the same rear der. *if* you don't exceed the capacity, which is hard not to do with a tripple. A cheaper way to get lower gearing is to get an older 8 speed XT rear cassette (get one that "goes to 11" - Spinal Tap) and the thin little spacer and a new Ultegra long cage rear der. the downside is that some of the jumps between gears are too big, but it is under $100 if you hunt around. |
You will find people that have cobbed a mix of parts together, but the price they pay is that it never really works that well.
I've been up, down and sideways on this one when the wife had 9 speed Ultegra double and I had 8 speed Ultegra double and we needed to get her on a triple following her knee surgery. I had all the parts and time to mess with every combination you could think of. Finally upgraded the wife to 3x9 and me to her old 2x9, then used the 2x8 to build up a bike for a buddy looking to get back into riding. Besides when you go full 3x9 Ultegra you shed alomst a full pound of weight - this is way under my magic index of $100 per ounce for economical high end upgrades.