Weight Weenies

Is it possible to convert my fsa team issue carbon triple chainset to a compact by just changing the rings? If so can you guys recommend some reasonably priced rings?

No.

FSA triples run a 130mm BCD for the middle and outer, so your smallest ring is 38t.

[I suppose you could run the rings in the inner and middle position, but that would just look silly]

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The fsa slk compacts run 130mm bcd also though?

Really....you 100% sure....?

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Sorry it wasnt the fsa slk.

http://pages.ebay.com/link/?nav=item.vi ... 0789130362

Forgiven....

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deanh wrote:Sorry it wasnt the fsa slk.

http://pages.ebay.com/link/?nav=item.vi ... 0789130362" onclick="window.open(this.href);return false;

That's $228 for an unbranded Octalink crank with 130BCD. And you were asking about wanting a compact which has a 110mm BCD.

OP you need help.

To change to a compact crank, I'm guessing you will need a new BB as well. The spindle length is usually different between triple and double cranksets. Octalink was a good system, but now obsolete. So, if that's what you have, not only are compact cranks going to be hard to find, but the spindle's most likely wrong anyway.

I posted that up as proof id seen a compact with 130mm bcd. My current fsa team issue carbon use the isis bb.

Ahh, you're not understanding what compact means.

Compact is 50/34t chainrings, and is 110mm BCD. 53/39t is standard and has 130mm BCD. The smallest ring you can possibly put on 130mm is 38t, or 37t using proprietary chainring bolts.

If you just want to put a standard 53/39 on your 130mm BCD, you can absolutely do that. You'll need to put a double derailleur and shifter. I'd say just leave your old shifter/derailleur/smallest ring, put 53/39 on the big rings, and just don't use the littlest ring.

The only other option is to just switch your BB, crankset, shifter, and front derailleur.

Thanks for that. Clears it up perfect.

I'll just use the current setup and limit the derailleur movement on the limit screws.

Next question is what rings to go for?

deanh wrote:Next question is what rings to go for?

For fun you can remove the inner chainring. Maybe find a shorter bottom bracket. Octalink was mentioned. Find one in a double crank length instead of the triple length you have now. Adjust the front derailleur limit screws to fit the new double crankset. Probably no need to change the chainrings. Assume it came with 53-39-30 chainrings originally. Just take off the 30 tooth inner and leave the 53-39 outer and middle rings alone. That is what most double cranksets come with from the factory.

Just to be clear. Even though you said in the first post that you wanted compact, you really don't want compact. Is that right?

For some strange reason I had in my head compact ratio was 53/39.

Middle ring is currently 42t so ideally I need to drop to 39t

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Yes, it is.
You can use only the two smallest rings.
Put any size smallest ring (104 BCD ?) and any size middle ring (130 BCD). If you want 34/50 = no problems.
Take biggest ring off, put washers instead to keep the same thickness for the bolts. Limit the FD so you don't drop the chain over the second ring.
Doesn't look silly at all. Just like a double.

I did this for both my daughters's bikes with a 34/42T setup on a triple.

Louis