Bike Forums

Bike Forums (https://www.bikeforums.net/forum.php)
-   Bicycle Mechanics (https://www.bikeforums.net/bicycle-mechanics/)
-   -   From Triple to Double Questions (https://www.bikeforums.net/bicycle-mechanics/293537-triple-double-questions.html)

mrt10x 05-01-07 01:32 PM
From Triple to Double Questions
 
My rooomate wants to change out his Ultegra 9-sp triple with a Compact FSA Double that a friend gave him for free. This is on a 04 Trek. I have talked to 6 dif mechanics here in San Diego and got 5 different answers on various questions. I know I need to change out the front deraileur to a double but here is the fuzzy parts.

1. will a 10 spd double work, or do I have to find a 9 sp double.
2. will his triple front shifter work with a double (most mechanics agreed it could be rigged)
3. will his long throw rear deraileur work?

Anything else I missed?

Sheldon Brown 05-01-07 01:39 PM
Originally Posted by mrt10x
My rooomate wants to change out his Ultegra 9-sp triple with a Compact FSA Double that a friend gave him for free. This is on a 04 Trek. I have talked to 6 dif mechanics here in San Diego and got 5 different answers on various questions. I know I need to change out the front deraileur to a double but here is the fuzzy parts.

1. will a 10 spd double work, or do I have to find a 9 sp double.
2. will his triple front shifter work with a double (most mechanics agreed it could be rigged)
3. will his long throw rear deraileur work?
Yes.

Sheldon "Concise" Brown
Code:
+------------------------------------------+
|  Some are born with a silver spoon,    |
|  And some are born without a clue;      |
|  Some are born to take the biscuit,    |
|  Some are born to just make do.        |
|                                          |
|  When those fatcats drop the big one,  |
|  They will turn a penny, too:          |
|  They will rent out nuclear shelters,  |
|  We'll get one with an outside loo!    |
|                        -- Oysterband    |
|  (The greatest band since the Beatles)  |
+------------------------------------------+

knobster 05-01-07 01:46 PM
One question you didn't put on there is:
4. Will my longer bottom bracket work with the double?

Answer: No.

mrt10x 05-01-07 01:47 PM
didnt realize I had asked three questions that could be answered in one word :) thanks

mrt10x 05-01-07 01:48 PM
It was a FSA mega exo crank with external bearings and it came with a new BB... thanks a ton.

tellyho 05-01-07 02:01 PM
Gee, I want friends like that!

mrt10x 05-01-07 02:12 PM
I know..i tried to give him my FSA ISIS CF compact and he turned his nose up at it. :)

Mr. Underbridge 05-01-07 02:25 PM
Originally Posted by mrt10x
My rooomate wants to change out his Ultegra 9-sp triple with a Compact FSA Double that a friend gave him for free. This is on a 04 Trek. I have talked to 6 dif mechanics here in San Diego and got 5 different answers on various questions. I know I need to change out the front deraileur to a double but here is the fuzzy parts.

1. will a 10 spd double work, or do I have to find a 9 sp double.
2. will his triple front shifter work with a double (most mechanics agreed it could be rigged)
3. will his long throw rear deraileur work?

Anything else I missed?
I would ask what the goal is - if you only replace the FD and cranks, I'd imagine you have most of the disadvantages of a triple mixed the reduced gear range and/or overlap of a double. I'd imagine if you want the advantages of a double, you'll want to replace more than that (short RD, BB maybe?).


All times are GMT -6. The time now is 01:01 AM.


Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.