Shimano 600, model 6100 - 3 arm cranks/chainring BCD?

27x114 · Mar 7, 2011

Hello,
I'm trying to find out the BCD (bolt circle diameter) for the following crankset.

Shimano 600, model 6100 - 3 arm

Please see the attached description,
Any information would be helpful.

www.velobase.com/ViewComponent.aspx?ID= ... 5&AbsPos=9

Thanks,

one-eyed_jim · Mar 7, 2011

deleted

creamedhoney · Mar 8, 2011

i've got a set of those at home. I'll have a go at measuring tonight.

creamedhoney · Mar 9, 2011

sorry, I knew there was something I was going to do last night. Will try and remember tonight., ben

tonyf39 · Mar 9, 2011

distance between adjacent bolts multiplied by 1.155 = BCD for 3 bolt chainrings
HTH

one-eyed_jim · Mar 9, 2011

tonyf39":2330228t said:
distance between adjacent bolts multiplied by 1.155

... or two upon root 3.

Surds are so much more retro eh?

I found (and then lost) an old Shimano catalogue in which replacement rings were listed from 30 teeth up. That suggests a bcd of about 95mm. The more common 3-bolt cranks of the period used 116mm.

tonyf39 · Mar 9, 2011

you can divide by 0.866 which is the more accurate method I believe..lol

creamedhoney · Mar 10, 2011

measured distance between adjacent bolts = 82mm (as far as my failing eyes van tell)

using the calcs suggested above gives bcd 95mm (ish)

my best guess measurement was 94mm so if 95mm is a 'standard' then that is probably right.

hope that helps

ben

Shimano 600, model 6100 - 3 arm cranks/chainring BCD?

27x114

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