Classic & Vintage - Sugino Might Tour Triples?

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pinnah
01-16-07, 11:44 AM
I'm researching older Japanese Triple cranks for my
1979 Trek 510.

I was wondering if anybody could answer a few questions about
the Sugino Mighty Tours. Matthew has a nice picture of them
on his kranks page at:
http://www.kogswell.com/krank.html

1) What is the the BCD of the granny? I believe it is
in the 50s but haven't been able to confirm this.

2) What is the tread (aka q-factor) of the cranks?

I really am looking for the sqaure crank arm look of
the old Suginos (and SRs). This is the style of
crank I grew up with.

Sierra
01-16-07, 11:58 AM
The Kogsell page you provided the link to gives the bcd. Looking at the photo of the Mighty Tour, you can see that the same bolts attach all the rings, so the granny has the same bcd as the other rings which is 110 mm. I have one at home. Tell me how to measure the q-factor.
John E
01-16-07, 02:49 PM
The smallest ring you can put on a 110mm BCD is 34 teeth. I have made up nice triples with either 52-48-34 or 48-45-34 (my favorite).

unworthy1
01-16-07, 05:45 PM
The Kogsell page you provided the link to gives the bcd. Looking at the photo of the Mighty Tour, you can see that the same bolts attach all the rings, so the granny has the same bcd as the other rings which is 110 mm. I have one at home. Tell me how to measure the q-factor.
"Q-factor" refers to the width spacing from pedal to pedal...this affects riders hip joints over time. It's a comparitive thing: measure installed cranks from inboard edge or centerline of left pedal to right pedal...then compare that to some other brand of crank and see who's "Q" is higher/lower.
Sierra
01-16-07, 07:18 PM
Sorry, can't help then as my crankset is not installed on a bike. I thought maybe I could measure between the outer face of the right arm and the chain rings to get it.