Chainring change
09-26-13 | 06:35 PM
#1
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Road runner
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Chainring change
Hi, I have a couple of cranks hanging around, FSA K-light and a FSA Force ( all compact) and would like to try a 53/39 setup , But when I checkout ebay and other sites to buy all the 53/39 are a 130mm bcd and mine are 110 mm , not sure what those #'s are indicating ... ???? Will a set of 53/39 FSA 130 mm fit my FSA cranks currently 50/34 110mm ********************
09-26-13 | 06:53 PM
#2
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From: Pittsburgh, PA
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
BCD means "bolt circle diameter", the diameter of the circle the bolts that fasten the chainrings to the arms lie on. No, you cannot fit 130 mm bcd chainrings to a 110 mm bcd crank. The bolts will not line up properly. There are 110 mm bcd chainrings available in 53 and 39T form but they aren't cheap. I believe TA Specialities offers them.
It might be less expensive to buy a complete "standard" double crank with the chainrings you want instead of buying replacement rings for your current compact crank.
It might be less expensive to buy a complete "standard" double crank with the chainrings you want instead of buying replacement rings for your current compact crank.
09-27-13 | 12:55 PM
#3
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From: Wilmington, DE
Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)
For $74 total, you can get FSA 52T and 38T 110 BCD rings: https://www.universalcycles.com/shopp...7&category=675
09-27-13 | 01:23 PM
#4
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Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)
09-27-13 | 01:31 PM
#6
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From: Wilmington, DE
Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)
09-27-13 | 01:34 PM
#7
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From: CID
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)
09-27-13 | 01:36 PM
#8
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From: Wilmington, DE
Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)
On second look, it's hard to argue that they aren't 110mm BCD rings. Nice find!
I swear they changed the picture from the first time I looked
I swear they changed the picture from the first time I looked
09-27-13 | 01:37 PM
#9
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From: Melbourne, Oz
Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231
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