Update - Double chainring -yikes

Went to the LBS. Told me changing the Chainring to a 50/34 would make a big difference, the only thing; I would lose my carbon crank. He changed it, I went for a drive, ALMOST NO DIFFERENCE. He scratched his head and said: I can change the cassette to a Mtn bike, but you'll lose your Ultegra derailer, but you'll have your carbon crank back. I couln't lose that , but after thinking about, I said DO IT!

What a difference. It's even better than my triple, but the bike is a bit heavier. I spent a total of 4 hrs waiting for him to do the chainring, put it back on and then cassette.

So now you have a 50/34 with a MTB cassette in the back? or is it your previous 53/39 with the MTB cassette?

Either way, glad to hear you got it all sorted out.

Glad you're happy! What is the gear range on your new cassette?

I'd be surprised if you really noticed the weight - it should only be a couple of hundred grams heavier. About the same as a tool kit, or a cell phone and 2-3 gel packs. Noticeable when you lift the bike, but not so much when you're riding.

The chainring is still 53/39, but the cassette, I'm not sure, it's got more rings than the other one.

FYI: There are compact cranksets with carbon crankarms. I have one, FSA's SL-K compact. They are available. Did the shop just not want to order one for you?

In terms of gear inches, there isn't much difference between a 34 chainring and a 27 cog (road setup) and a 39 chainring and 32 cog (road/mtn setup): 33 vs. 32 gear inches. One big difference between the two set-ups is the weight, however, which may more than negate the slight gearing advantage the road/mtn setup has.

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Originally Posted by ilima

FYI: There are compact cranksets with carbon crankarms. I have one, FSA's SL-K compact. They are available. Did the shop just not want to order one for you?

In terms of gear inches, there isn't much difference between a 34 chainring and a 27 cog (road setup) and a 39 chainring and 32 cog (road/mtn setup): 33 vs. 32 gear inches. One big difference between the two set-ups is the weight, however, which may more than negate the slight gearing advantage the road/mtn setup has.

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Two LBS called FSA and they don't have them. He said something about I have a 9 spd 130mm and now they make 110mm 10 spd.

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Originally Posted by violette

Two LBS called FSA and they don't have them. He said something about I have a 9 spd 130mm and now they make 110mm 10 spd.

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Standard cranksets use a 130mm bolt circle diameter. The smallest chainring possible is 38 teeth.

Compact cranksets use a 110mm BCD, which allows a smallest chainring of 34 teeth.

FSA advertises their cranksets as 9/10 speed compatible.
http://road.fullspeedahead.com/fly.a...xid=53&pid=292

If you're happy with your set-up now, I wouldn't worry about it.

Quote:

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Originally Posted by ilima

Standard cranksets use a 130mm bolt circle diameter. The smallest chainring possible is 38 teeth.

Compact cranksets use a 110mm BCD, which allows a smallest chainring of 34 teeth.

FSA advertises their cranksets as 9/10 speed compatible.
http://road.fullspeedahead.com/fly.a...xid=53&pid=292

If you're happy with your set-up now, I wouldn't worry about it.

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Quote:

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Originally Posted by violette

Two LBS called FSA and they don't have them. He said something about I have a 9 spd 130mm and now they make 110mm 10 spd.

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Now I'm curious about what they did put on your bike the first time they swapped things....