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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 08-04-07, 02:34 PM   #1
dlandis
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144 BCD versus smaller

Most track cranks are 144mm, but all the way down to 130mm seems pretty common. Maybe you have more options for tooth count in a larger size?? Still, you could achieve the same gearing with 130mm/49T that most people would want. Smaller would be lighter and possibly shorter chain also... So why is 144 far and away the most common?
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Old 08-04-07, 02:35 PM   #2
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it justs a different holes pattern..wont effect gearinches. Just think of it as a car wheels bolt pattern.
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Old 08-04-07, 04:39 PM   #3
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Originally Posted by dlandis View Post
So why is 144 far and away the most common?
144 bcd is the old Campagnolo standard from the early-60's through the mid-80's. Many companies copied this and many companies, especially Japanese ones, still use old Campy sizes, specs and even old molds. Take the MKS Sylvan pedals for example.

Last edited by jjvw; 08-05-07 at 12:39 PM.
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Old 08-04-07, 06:37 PM   #4
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You can get the same gearing with the same tooth count, but it's easier to find lower tooth sizes in 130bcd. And I suppose the same tooth size in 144bcd would be negligibly stiffer than 130 or 135 due to the bigger 'spider'.
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Old 08-05-07, 07:00 AM   #5
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Larger BCD means less stress on the chainring since the spider extends farther, so you get less chainring flex. If you're built like Nelson Vails you want the largest BCD that'll take the smallest chainring you might use. For mere mortals, that's not much of an issue.
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