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can I replace 2x9 Tiagra crank with 2x11 105 5800 crank ?

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can I replace 2x9 Tiagra crank with 2x11 105 5800 crank ?

Old 04-08-17, 03:32 PM
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georgeav
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can I replace 2x9 Tiagra crank with 2x11 105 5800 crank ?

Hi,

I have a Scott 2009 or 2010 bike with mostly 2x9 Tiagra 4500 equipment. My crank has an issue, the right crank is wobbly, the mechanic opened it up and it seems that the ax between the cranks is pretty loose, so I have to replace it; this leads me to a dilemma:

1. Can I replace my 2x9 Tiagra FC 4550 with an 2x11 105 5800L crank while leaving the rest intact (9 speed cassette) ?
The options are:
- 2x9 Sora FC-R3000 50/34 175 mm 65 euro;
- 2x10 105 FC-5750-L 119 eur;
- 2x11 105 FC-5800-L 118 eur.
I prefer the 5800 as it's future proof in case I decide to upgrade the whole bike to 2x11 and even if not, the bike will have better resale value and opportunities if it has 105 crank instead of Sora.

2. I'd also like to change the BB with this occasion, and it doesn't seem expensive. Options:
- BB-RS500 11 eur
- SM-BBR60 Ultegra 77g 17 eur
- BB-R9100 Dura Ace 33 eur
Is there a reason (except price) why I wouldn't go for the Dura Ace ? Is it less robust, requires more maintenance, etc ?


3. And since I'm in the neighborhood maybe I change the front derailler as well. Now I have Tiagra FD-4500 2x9. Options:
- 105 FD-5800 25 eur
- Ultegra FD-6800 30-35 eur
Is my left shifter compatible with this ones ? Which one would you recommend ?


Thank you !
George
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Old 04-08-17, 04:07 PM
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dsbrantjr
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If your bottom bracket (that axle between the cranks) is loose, why not just replace that? Replacing working components with new ones in anticipation of future resale will gain you little if anything, if you do eventually resell it.
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Old 04-08-17, 04:19 PM
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9/10/11 speed chainrings are the same width, so you can use either the 5750 or the 5800 with your current setup-- the question is, do you want the 5750 so you can stick with regular 110bcd chainrings, or do you want to commit to the 4-bolt Shimano asymmetric chainrings? Oh, the CX50 is a possible option for you as well-- from my research, the RS500, CX50, and 5750 are essentially the same cranks with different logos.

I'm all about the SM-BBR60. Works great, and is cheap. The only difference I've been able to determine between the Ultegra and the DuraAce is that the latter is 12g lighter and costs twice as much.
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Old 04-08-17, 04:31 PM
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Originally Posted by dsbrantjr View Post
If your bottom bracket (that axle between the cranks) is loose, why not just replace that? Replacing working components with new ones in anticipation of future resale will gain you little if anything, if you do eventually resell it.
the 4500 is a HT2 crank, if the axle is FUBAR, then the whole crank is, the BB may still be fine.

For replacing the crank, if the OP wants to go with 5800, it will work, just as a R3000 (Sora 9 speed) or 4700 (Tiagra 10 speedd) will, with the current BB.

Last edited by jimc101; 04-08-17 at 04:59 PM.
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Old 04-08-17, 05:26 PM
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Old 04-08-17, 10:42 PM
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Originally Posted by georgeav View Post
.......the bike will have better resale value and opportunities if it has 105 crank instead of Sora.......
You have to be joking !!!! You want to spend an extra 50 eur for something that might if you are extremely lucky increase the resale by 5 eur **********?
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Old 04-08-17, 11:16 PM
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0. You might need to replace the whole crank. Do double check.

1. 11 speed crankset will work. You'll get about 50 grams lighter bicycle, but you'll pay about 50 euros more.

2. Any Hollowtech II compatible BB will work. More expensive ones are usually just a little lighter.

3. 11 speed FDs will not work well. Neither will the 10 speed Shimano Tiagra 4700 equipment. The rest of the 10, 9, 8, 7... speed stuff will work just fine.

I'd change just what is broken with the cheapest option and keep riding. Hell, if the BB needs changing too, I'd go with an older, cheaper, more durable Octalink 2 crankset. Or even a square tapper one. Call me retrogrouch.

P.S. Wrote a series of articles on various component compatibilities, so you can check for yourself when mix-matching:

Compatibility Archives - Cycle Gremlin
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Old 04-09-17, 03:05 PM
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georgeav
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Thanks for the advice guys. I'll take the ultegra BB and I'll think about the crank.

Originally Posted by Slaninar View Post
P.S. Wrote a series of articles on various component compatibilities, so you can check for yourself when mix-matching:

Compatibility Archives - Cycle Gremlin
You have some very helpful articles there ! The site went straight to bookmarks.
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