Compact Crank w/o the crank?
05-27-08, 05:56 PM
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Compact Crank w/o the crank?
I am looking to switch my 105 52/39 to a more compact setup. I cannot find less than a 39 with a 130mm pattern. What do i need to do in order to get a smaller setup with out buying a new crank/FD?
I looked at the other compact crank threads and couldnt find the answer, sorry if I am repeating...
Thanks!
I looked at the other compact crank threads and couldnt find the answer, sorry if I am repeating...
Thanks!
05-27-08, 06:03 PM
#2
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I am looking to switch my 105 52/39 to a more compact setup. I cannot find less than a 39 with a 130mm pattern. What do i need to do in order to get a smaller setup with out buying a new crank/FD?
I looked at the other compact crank threads and couldnt find the answer, sorry if I am repeating...
Thanks!
I looked at the other compact crank threads and couldnt find the answer, sorry if I am repeating...
Thanks!
05-27-08, 06:03 PM
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A triple chain ring, but that means you need a new FD and front shifter.
Think about it, there's a reason why 38 teeth is the minimum for 130bcd, any smaller there will be no place for the bolts to go.
You have two choice here:
Stick with your setup and ride harder.
Go out and buy a compact crank, I believe Shimano 4550 50/34 is about $100.
Think about it, there's a reason why 38 teeth is the minimum for 130bcd, any smaller there will be no place for the bolts to go.
You have two choice here:
Stick with your setup and ride harder.
Go out and buy a compact crank, I believe Shimano 4550 50/34 is about $100.
05-27-08, 06:08 PM
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use a bigger cassette? 39T to 34T in the front is like going from a 23T to 29T in the back.
-5T from the chairing is like +5.5T in the back.
-5T from the chairing is like +5.5T in the back.
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
05-28-08, 08:43 AM
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Thanks all, i figure that was the case... So here is the next dilemma:My bike is a 84 pinarello with new 105 on it, but it has a threaded BB, and it looks that all the Compact Cranks are for the threadless BBs. What to do?
05-28-08, 08:46 AM
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The FSA K-Force Light is a compact 110BCD, not 130BCD. You have the choice of either 52/38T or 50/34T chainrings
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Last edited by ZXiMan; 05-28-08 at 08:51 AM.
05-28-08, 08:48 AM
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05-28-08, 09:04 AM
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Does your bottom bracket have a square spindle? If so, you need to find a compact crank for square taper. Otherwise, you can just get a bottom bracket to match. I did this with the Nashbar compact crank + ISIS bottom bracket combo deal. Not the greatest, but it works. Just make sure your bottom bracket shell isn't some weird size (ask the classic and vintage forum guys).
05-28-08, 09:20 AM
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Does your bottom bracket have a square spindle? If so, you need to find a compact crank for square taper. Otherwise, you can just get a bottom bracket to match. I did this with the Nashbar compact crank + ISIS bottom bracket combo deal. Not the greatest, but it works. Just make sure your bottom bracket shell isn't some weird size (ask the classic and vintage forum guys).
https://www.bikeforums.net/showpost.p...57&postcount=3
05-28-08, 09:22 AM
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You can get the cheaper 4550 tiagra compact crank with outboard BB for around $100 and the shifting performance is similar, you only lose out on weight.
btw, you can put on a campagnolo compact square taper on there if your BB is square taper.
yes, yes, they're not the same, but they will fit and work.
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
05-28-08, 09:29 AM
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... he was referring to the fact that FSA (and others) make a 38 tooth 130mm bcd *chainring* that you can purchase separately. 
Also, with ANY compact crankset, you have the option of simply putting 52/38T rings on it. It isn't something special about the FSA one.
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05-28-08, 09:35 AM
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I think Ritchey compact cranks work with octalink, right? Maybe some Sugino models also?
Personally, I'd do the BB as well. I'm running an r700 on one bike and a Tiagra (r4550) on another. Both are paired with 9-speed 105 groups.
Personally, I'd do the BB as well. I'm running an r700 on one bike and a Tiagra (r4550) on another. Both are paired with 9-speed 105 groups.
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05-28-08, 10:09 AM
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A 1984 Pinarello will likely have an Italian threaded bottom bracket so keep that in mind when deciding on what to buy.
05-28-08, 10:24 AM
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05-28-08, 10:26 AM
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correct, I have a Octalink BB with 105 crank. My bike is italian thread, 109.5mm. Can i put an outboard BB on this?
05-28-08, 10:31 AM
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yeah, totally. just get the italian threaded outboard BB cups if you want to go with the hollowtech2 cranks.
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Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
05-28-08, 10:39 AM
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Thank you all for the help! Sometimes I feel like a dufus on this forum, but i always get my questions answered... Keep it up!
05-28-08, 11:16 AM
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05-28-08, 12:11 PM
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My experience on this same conversion was that the short cage works just fine and I needed to shorten the chain since the 50 tooth front is smaller than the 53 tooth standard and 34 tooth inner ring needs less chain than the 39 tooth. I also just moved the 105 front der. down and it shifts just fine.
05-28-08, 01:58 PM
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I got a bike with a 53-39 up front. For gearing down I got an 11-28 cassette = quick and cheap
