Author Topic: single speed chain ring and BCD menace (Read 1829 times)

Doo · « **on:** 08 September, 2013, 05:06:33 pm »

Hi forum folk,

Am struggling to build up my single speed.

Basically, ail is good except the front chain ring. I want a 48t chainring and have seen a few options. However, I am now being 'spun out' with a BCD figure. I have pedal arms from a shimano ultegra compact chain set that I want to fit to said chain ring but am not sure about the BCD figures. Any help would be great.

Cheers,

Doo

Chris N · « **Reply #1 on:** 08 September, 2013, 05:14:09 pm »

Ultegra compact = 110mm BCD. More info: http://sheldonbrown.com/cribsheet-bcd.html

Doo · « **Reply #2 on:** 08 September, 2013, 09:35:24 pm »

^ Cheers. Deano directed me there too.

Rhys W · « **Reply #3 on:** 11 September, 2013, 08:48:22 pm »

You can work out the BCD by measuring the distance between the hole centres and a bit of simple geometry (hint: pentagon). Quite satisfying, especially if you had one of these when you were in school:

Author Topic: single speed chain ring and BCD menace (Read 1829 times)

Doo

single speed chain ring and BCD menace

Chris N

Re: single speed chain ring and BCD menace

Doo

Re: single speed chain ring and BCD menace

Rhys W

Re: single speed chain ring and BCD menace